CN104586421B - It is a kind of to eliminate the eccentric method and apparatus in pendulum position - Google Patents
It is a kind of to eliminate the eccentric method and apparatus in pendulum position Download PDFInfo
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- CN104586421B CN104586421B CN201410851554.2A CN201410851554A CN104586421B CN 104586421 B CN104586421 B CN 104586421B CN 201410851554 A CN201410851554 A CN 201410851554A CN 104586421 B CN104586421 B CN 104586421B
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Abstract
The eccentric method and apparatus in pendulum position are eliminated the embodiment of the invention discloses a kind of, methods described includes：Calculate region of interest centers and the vertical drop of the pivot of CT scan system of scanned human body；According to the vertical drop, the scanning bed vertical height of the CT scan system is adjusted, it is eccentric to eliminate pendulum position.Pivot of the invention in the region of interest centers of scanned human body not with CT scan system is overlapped, and adjusts scanning bed vertical height, eliminates pendulum position bias, and the final quality for causing scan image is improved.In addition, when area-of-interest is the heart or heart near zone of human body, the present invention can also eliminate pendulum position bias, improve temporal resolution, finally cause the scan image Quality advance of heart.
Description
Technical field
The present invention relates to medicine technology field, and in particular to a kind of eccentric method and apparatus in elimination pendulum position.
Background technology
In CT conventional sweeps, ideally, the area-of-interest (English of human body is scanned：region of
Interest, abbreviation：ROI) center should be overlapped with the pivot of CT scan system, i.e., the pendulum position during CT scan is not inclined
The situation of the heart.Wherein, being scanned the area-of-interest of human body can pass through in plain film image of the user in the scanned human body
Posting is chosen.Both can be the entire scope of whole human body or the partial cut-away chosen along human body Z-direction, such as Fig. 1 institutes
Show, for selection partial cut-away entire scope as area-of-interest schematic diagram.Furthermore it is also possible to be selected along human body Z-direction
The subrange of the partial cut-away taken, as shown in Fig. 2 subrange the showing as area-of-interest of the partial cut-away for selection
It is intended to.
When the pendulum position of the area-of-interest of scanned human body is eccentric, that is to say, that the area-of-interest of scanned human body
Pivot of the center not with CT scan system is overlapped, and the scanning dose of the area-of-interest of scanned human body can be caused uneven
It is even, so that picture noise is inconsistent, while increasing the use of effective dose, reduce the effective rate of utilization of scanning dose.Separately
Outside, when area-of-interest is the heart or heart near zone of human body, pendulum position bias can cause temporal resolution to decline, finally
Causing the scan image quality of heart reduces.
The content of the invention
In view of this, the eccentric method and apparatus in pendulum position in scanning are eliminated the invention provides a kind of.
A kind of method for elimination pendulum position bias that the present invention is provided, methods described includes：
Calculate region of interest centers and the vertical drop of the pivot of CT scan system of scanned human body；
According to the vertical drop, the scanning bed vertical height of the CT scan system is adjusted, it is inclined to eliminate pendulum position
The heart.
It is preferred that, when the area-of-interest of the scanned human body is the entire scope of people's body section, the calculating quilt
The vertical drop of the region of interest centers of human body and the pivot of CT scan system is scanned, including：
The people's body section for being scanned human body is carried out after plain film lateral projection scanning, the plain film life number of people's body section is obtained
According to；
Data are given birth to according to the plain film, the corresponding detector channel of barycenter of people's body section is determined；
Judge whether the distance between central passage detector channel corresponding with the barycenter of the detector is more than
Predetermined threshold value, if it is, determining that the barycenter of people's body section deviates the deviation angle of the pivot；
According to the deviation angle, the barycenter of people's body section and the vertical drop of the pivot are calculated.
It is preferred that, when the area-of-interest of the scanned human body is the entire scope of people's body section, the calculating quilt
The vertical drop of the region of interest centers of human body and the pivot of CT scan system is scanned, including：
The people's body section for being scanned human body is carried out after plain film lateral projection scanning, the plain film figure of people's body section is obtained
Picture；
According to the plain film image, the vertical height of the peak of people's body section of the scanned human body is determined；
According to the vertical height and the vertical height of minimum point of the peak of people's body section, calculate the human body and break
The vertical height at the center in face, the center of people's body section is the midpoint of the highs and lows of people's body section, or
Person is the centroid position of the pixel between the peak and the minimum point；
Calculate the vertical height and the vertical height of the pivot of CT scan system prestored at the center of people's body section
The difference of degree.
It is preferred that, when the area-of-interest of the scanned human body is the subrange of people's body section, the calculating quilt
The vertical drop of the region of interest centers of human body and the pivot of CT scan system is scanned, including：
Calculate the vertical height at the center of the area-of-interest of the scanned human body；
The vertical height for calculating the center of the area-of-interest is vertical with the pivot of CT scan system that prestores
The difference of height.
It is preferred that, when the area-of-interest of the scanned human body is heart or heart near zone, the calculating quilt
The vertical drop of the region of interest centers of human body and the pivot of CT scan system is scanned, including：
The people's body section for being scanned human body is carried out after plain film lateral projection scanning, the plain film figure of people's body section is obtained
Picture；
Image dividing processing is carried out to the plain film image, the corresponding image of the area-of-interest is obtained；
The vertical height of the barycenter of the corresponding image of the area-of-interest is calculated, and the vertical height of the barycenter is true
It is set to the vertical height at the center of the area-of-interest；
The vertical height for calculating the center of the area-of-interest is vertical with the pivot of CT scan system that prestores
The difference of height.
The eccentric device in pendulum position is eliminated present invention also offers a kind of, described device includes：
Computing module, for calculating hanging down for the region of interest centers of scanned human body and the pivot of CT scan system
Straight difference in height；
Adjusting module, for according to the vertical drop, adjusting the scanning bed vertical height of the CT scan system,
It is eccentric to eliminate pendulum position.
It is preferred that, the computing module includes：
First scanning submodule, the entire scope for when the area-of-interest of the scanned human body being people's body section
When, the people's body section for being scanned human body is carried out after plain film lateral projection scanning, the plain film life data of people's body section are obtained；
First determination sub-module, for giving birth to data according to the plain film, determines the corresponding inspection of barycenter of people's body section
Survey device passage；
First judging submodule, the central passage detector channel corresponding with the barycenter for judging the detector
The distance between whether be more than predetermined threshold value；
Second determination sub-module, for when the result of first judging submodule is to be, determining people's body section
Barycenter deviate the deviation angle of the pivot；
First calculating sub module, for according to the deviation angle, calculating the barycenter of people's body section and the rotation
The vertical drop at center.
It is preferred that, the computing module includes：
Second scanning submodule, the entire scope for when the area-of-interest of the scanned human body being people's body section
When, the people's body section for being scanned human body is carried out after plain film lateral projection scanning, the plain film image of people's body section is obtained；
3rd determination sub-module, for according to the plain film image, determining people's body section of the scanned human body most
The vertical height of high point；
Second calculating sub module, for the peak according to people's body section vertical height and minimum point it is vertical
Highly, the vertical height of the barycenter of people's body section is calculated, the barycenter of people's body section is the highest of people's body section
The midpoint of point and minimum point, or be the centroid position of the pixel between the peak and the minimum point；
3rd calculating sub module, vertical height and the CT scan system that prestores for the barycenter that calculates people's body section
Pivot vertical height difference.
It is preferred that, the computing module includes：
4th calculating sub module, the subrange for when the area-of-interest of the scanned human body being people's body section
When, calculate the vertical height at the center of the area-of-interest of the scanned human body；
5th calculating sub module, vertical height and the CT scan system that prestores for the center that calculates the area-of-interest
The difference of the vertical height of the pivot of system.
It is preferred that, the computing module includes：
3rd scanning submodule, for being heart or heart near zone when the area-of-interest of the scanned human body
When, the people's body section for being scanned human body is carried out after plain film lateral projection scanning, the plain film image of people's body section is obtained；
Submodule is handled, for carrying out image dividing processing to the plain film image, the area-of-interest correspondence is obtained
Image；
6th calculating sub module, the vertical height of the barycenter for calculating the corresponding image of the area-of-interest, and will
The vertical height of the barycenter is defined as the vertical height at the center of the area-of-interest；
7th calculating sub module, vertical height and the CT scan system that prestores for the center that calculates the area-of-interest
The difference of the vertical height of the pivot of system.
In the present invention, the region of interest centers of scanned human body and hanging down for the pivot of CT scan system are calculated first
Straight difference in height.Secondly, according to the vertical drop, the scanning bed vertical height of the CT scan system is adjusted, to eliminate
Put position eccentric.Pivot of the invention in the region of interest centers of scanned human body not with CT scan system is overlapped, and is adjusted
Scanning bed vertical height, eliminates pendulum position bias, and the final quality for causing scan image is improved.In addition, working as region of interest
When domain is the heart or heart near zone of human body, the present invention can also eliminate pendulum position bias, improve temporal resolution, finally make
Obtain the scan image Quality advance of heart.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme in the embodiment of the present application, make required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present application, for
For those of ordinary skill in the art, without having to pay creative labor, it can also be obtained according to these accompanying drawings
His accompanying drawing.
Fig. 1 is that the entire scope for the partial cut-away chosen is used as the schematic diagram of area-of-interest；
Fig. 2 is that the subrange for the partial cut-away chosen is used as the schematic diagram of area-of-interest；
Fig. 3 is the scanning schematic diagram under some x-ray projection angle；
The graph of relation of the projection angle of the intensity of each bar ray and X-ray before Fig. 4 is scanning human body；
X-ray intensity and the graph of relation of the projection angle of X-ray that Fig. 5 receives for detector after scanning human body；
Fig. 6 is a kind of method flow diagram for eliminating pendulum position bias provided in an embodiment of the present invention；
Fig. 7 is scanned body scans schematic diagram.
Fig. 8 is to give birth to the attenuation curve that data obtain the X-ray that detector each channel reception is arrived according to the plain film；
Fig. 9 is scanned the principle schematic of the vertical range of the center deviation pivot of human body for calculating；
Figure 10 is scanned the principle schematic of the vertical height at the center of human body for calculating；
Figure 11 is a kind of apparatus structure schematic diagram for eliminating pendulum position bias provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on
Embodiment in the application, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of the application protection.
In CT conventional sweeps, under normal circumstances, as shown in figure 3, being the scanning signal under some x-ray projection angle
Figure.Wherein, it is scanned the pivot that human body is centrally located at CT scan system.Pass through the X-ray fladellum of shape filter
In, the intensity of each bar ray and the projection angle of X-ray are as shown in Figure 4.Pass through due to central ray in shape filter
Distance is most short, so the intensity of central ray is maximum.And the X-ray intensity of central ray both sides is less and less, because
It is increasingly longer through the distance of shape filter for them.Because scanned human body is centrally located in the rotation of CT scan system
The heart, so center of the central ray right through scanned human body, is so allowed in fladellum ray, the ray of maximum intensity
It is also most long by the path of human body, and intensity less ray in both sides is also smaller by the path of human body, is finally connect in detector
The X-ray intensity and the relation of the projection angle of X-ray received is as shown in figure 5, be similar to horizontal line.This can improve final scanning
The noise uniformity of image, and effectively reduce total scanning dose.
When scanned human body pendulum position is eccentric, that is, it is scanned the center of human body and the pivot of CT scan system differs
Cause, if shape filter is constant, the ray through the center of scanned human body has not been the X of the maximum intensity in fladellum
Ray, so the X-ray for each projection angle that detector is received is slight inconsistent, ultimately results in the noise of scan image
Uniformity is reduced, and picture quality is affected.
The embodiment of the present invention proposes a kind of method for eliminating pendulum position bias, when the area-of-interest pendulum position of scanned human body is inclined
During the heart, the center of the area-of-interest is positioned by its plain film lateral projection, the area-of-interest is calculated eccentric
Distance, and adjust automatically is scanning bed so that the center of the area-of-interest is moved to the pivot of CT scan system, most
Whole formula is scanned the dosage of human body receiving evenly, while reduction effective dose, improves the noise uniformity of scan image.
It is the method flow diagram provided in an embodiment of the present invention for eliminating pendulum position bias with reference to Fig. 6, methods described includes：
S601：Calculate the region of interest centers and the vertical height of the pivot of CT scan system of scanned human body
Difference.
In order to which the pendulum position for eliminating the scanned human body in scanning is eccentric, the embodiment of the present invention needs to calculate scanned human body
Area-of-interest center and CT scan system pivot vertical drop.In practical application, calculate described vertical
The mode of difference in height is more, three kinds of modes is only described below in the embodiment of the present invention, but be actually not limited to three kinds of modes.
The first：
The area-of-interest of the scanned human body of this mode suitable for Fig. 1 is the entire scope of people's body section
Situation.Specifically, being carried out first to the people's body section for being scanned human body after plain film lateral projection scanning, people's body section is obtained
Plain film gives birth to data.Secondly, data are given birth to according to the plain film, determines the corresponding detector channel of barycenter of people's body section.Again
It is secondary, judge whether the distance between central passage detector channel corresponding with the barycenter of the detector is more than default threshold
Value, if it is, determining that the barycenter of people's body section deviates the channel number of the pivot.Finally, according to described logical
Road number, calculates the barycenter of people's body section and the vertical drop of the pivot.
In practical application, as shown in fig. 7, being scanned body scans schematic diagram.Wherein, ellipse representation is scanned human body
Cross section, human body is lain low on scanning bed, and the scanning of plain film lateral projection is scanned from the side of scanned human body.Pass through detection
Plain film that device is scanned life data, and data are given birth to according to the plain film obtain the X-ray that detector each channel reception is arrived
Attenuation curve, as shown in figure 8, abscissa represents the decay of X-ray, ordinate represents the channel number of detector.Then, according to institute
The attenuation curve of X-ray is stated, the X-ray attenuation degree highest which channel reception of detector is arrived is determined, the channel number is made
For passage corresponding with the barycenter of people's body section.In the case of normally scanned human body pendulum position is uninfluenced, the passage should
The central passage of the exactly detector.So, can around this principle, it is determined that whether scanned human body puts position bias.
Specifically, when determining the corresponding passage of barycenter of people's body section, all of people's body section can be obtained first
The attenuation curve of the X-ray of tangent plane, that is to say, that the plain film life data that plain film scanning is obtained are made up of M tangent plane, are each cut
Face is gathered by N number of detector channel and obtained, i.e.,
Rawdata={ p00,p01,p02,......,pij... }, i=0,1,2,3 ..., M-1, j=0,1,2,
3......,N-1；
Wherein, pijRepresent that the plain film that i-th of tangent plane is collected by j-th of passage gives birth to data, rawdata represents the human body
The plain film life data of tangent plane.
Secondly, the plain film life data based on acquisition, the passage where the barycenter for all tangent planes for calculating people's body section：
Wherein, XmFor the passage where barycenter, i is the mark of tangent plane, and j represents the mark of passage.
Then, the corresponding passage X of the barycenter is judgedmWhether the central passage position of detector, or the two should be at
Deviation it is whether smaller (be less than a predetermined threshold value), if it is, determining that the scanned human body pendulum position is not eccentric；Otherwise,
Think that the scanned human body pendulum position is eccentric.
When scanned human body pendulum position is eccentric, the port number that the corresponding passage of barycenter deviates with central passage is：Therefore the angle [alpha] of the barycenter deviation pivot of scanned human body is：
Wherein, the overall channel number of N detectors, β is the fan angle of whole passages.
As shown in figure 9, the principle schematic of the vertical range to calculate the center deviation pivot for being scanned human body.Its
In, the radius of turn for pre-setting CT scan system is r, then is scanned the vertical range h of the center deviation pivot of human body
For：
Second：
The area-of-interest for the scanned human body that this mode is also applied in Fig. 1 is the entire scope of people's body section
Situation.Specifically, being carried out first to the people's body section for being scanned human body after plain film lateral projection scanning, people's body section is obtained
Plain film image.Secondly, according to the plain film image, the vertical height of the peak of people's body section of the scanned human body is determined
Degree.Again, according to the vertical height of the peak of people's body section and the vertical height for the minimum point that prestores, the people is calculated
The vertical height of the barycenter of body section, the barycenter of people's body section is in the highs and lows of people's body section
Point.Finally, the vertical height and the vertical height of the pivot of CT scan system prestored of the barycenter of people's body section are calculated
The difference of degree.
In practical application, the vertical height of the scanning bed mattress surface of scanned human contact is precalculated.Such as Figure 10
It is shown, wherein, 1 is scanning holes, and 2 be light source, and 3 be detector, and 4 be scanning bed, and 5 be human body；At scanning bed center position
The height of bed is H1, and bed board thickness is D1, and mattress thicknesses are D2, then is scanned the vertical height of the scanning bed mattress surface of human contact
Spend for H2, specific calculation：H2=H1+ (D1/2)+D2.Because the vertical height H5 at the center for being scanned human body can be approximate
Equal to the scanned human body center in the peak of chest and the scanning bed mattress surface of the scanned human contact
Middle.So, also need to calculate the vertical height H3 of peak of the center of the scanned human body in chest below,
It can determine that H5 size.
The present embodiment also needs to carry out plain film lateral projection scanning to the people's body section for being scanned human body, obtains the human body and breaks
The plain film image in face.The plain film image is regarded as to each picture on the coordinate system of a pixel, i.e., described plain film image
The point that element is not zero has one's own coordinate value.Specifically, determining the ordinate P1 of the peak of the plain film image, i.e.,
The maximum point of ordinate.Determine the corresponding ordinate P of pivot of CT scan system.Meanwhile, it is determined that each pixel is hanging down
Nogata to length D3, specifically, predefine the plain film image visual field FOV in vertical direction length be FOV1, and
And the matrix size of the plain film image is, it is known that its pixel number in vertical direction is P simultaneously.Each picture can then be calculated
The physical length D3=FOV1/P of vegetarian refreshments in vertical direction.Specifically, the scanned people can be calculated by above parameter
The center of body is in the vertical height of the peak of chest, and formula is as follows：
H3=H4+ (P1-P/2) * (FOV1/P)；
Wherein, H3 represents the vertical height of peak of the center of the scanned human body in chest；H4 represents default
The vertical height of the pivot of CT scan system.
Then, in order to the pivot that calculates the CT scan system vertical height and the scanned human body center
Vertical height.The present embodiment also needs to calculate the vertical height at the center of the scanned human body.As shown in Figure 10, it is described
The vertical height at the center of scanned human body is equal to the height of H3 and H2 central point：
H5=(H3+H2)/2；
Wherein, H3 represents the vertical height of peak of the center of the scanned human body in chest；H2 is swept to be described
Retouch the vertical height of the scanning bed mattress surface of human contact.
In addition, the center of people's body section can also be the barycenter position of the pixel between the peak and the minimum point
Put, that is to say, that the centroid position of the pixel between peak and minimum point by calculating people's body section can be true
Determine H5 size.
Finally, calculate H5 and H4 difference, and the difference is defined as people's body section center vertical height with
The difference of the vertical height of the pivot of the CT scan system prestored.
The third：
This mode can simultaneously suitable for Fig. 1 the area-of-interest of the scanned human body be the whole of people's body section
The situation of body scope, and the scanned human body in Fig. 2 area-of-interest be people's body section subrange situation.
Specifically, this method calculates the center of the area-of-interest of the scanned human body first according to the posting of scanned human body
Vertical height.Secondly, in the rotation of vertical height and the CT scan system prestored for calculating the center of the area-of-interest
The difference of the vertical height of the heart.
In practical application as, the center of the posting of the scanned human body is directly regarded to the people of the scanned human body
The center of body section.That is, the vertical height at center by calculating the posting and the CT scan system that prestores
The difference of the vertical height of pivot, determines whether the scanned human body pendulum position is eccentric.
Specifically, after plain film lateral projection scanning is carried out to the human body tomography of the scanned human body, obtaining plain film image.
The posting that user is understood in dragged image chooses area-of-interest, by area-of-interest circle in the center of posting.We can
To think that the center of area-of-interest is located in the center of posting, the center deviation of area-of-interest can be estimated accordingly
The vertical range of pivot.Assuming that after user's dragging posting, the lower edges of posting ordinate in the picture point
Not Wei P2, P3, then the ordinate at posting center is (P2+P3)/2, if the vertical height at posting center is H6, then it is fixed to calculate
The vertical range h of the center deviation pivot of position frame：
H=H6-H4=((P2+P3)/2-P/2) * (FOV1/P)；
Wherein, H4 represents the vertical height of the pivot of default CT scan system.
In addition, when the area-of-interest of the scanned human body is heart or heart near zone, due to being scanned people
Body pendulum position bias can cause temporal resolution to reduce, and then make it that the scan image of heart is second-rate.
It is the situation of heart or heart near zone for the area-of-interest for being scanned human body, the present embodiment can be to quilt
The people's body section for scanning human body is carried out after plain film lateral projection scanning, obtains the plain film image of people's body section.Secondly, to described
Plain film image carries out image dividing processing, obtains the corresponding image of the area-of-interest, that is, the corresponding image of heart.Meter
The vertical height of the barycenter of the corresponding image of the area-of-interest is calculated, and the vertical height of the barycenter is defined as the sense
The vertical height at the center in interest region.The CT scan for finally calculating the vertical height at the center of the area-of-interest and prestoring
The difference of the vertical height of the pivot of system.
In practical operation, the processing mode that can be split by image, by body cavity (the dark-coloured portion of the centre of plain film image
Point) split, then edge extracting is carried out in dark colored portion, the edge of area-of-interest is obtained, then by between two edges
The centroid calculation of pixel comes out the center as area-of-interest.Then the center deviation pivot of area-of-interest is calculated
Vertical range.
S602：According to the vertical drop, the scanning bed vertical height of the CT scan system is adjusted, to eliminate pendulum
Position is eccentric.
, can sweeping to the CT scan system when it is determined that the pendulum position of the scanned human body is eccentric in the present embodiment
Retouch bed and send control command.It is described it is scanning bed can be according to the region of interest centers of the scanned human body and CT scan system
Pivot vertical drop lifting in vertical direction or decline so that the area-of-interest of the scanned human body
Center is overlapped with the pivot of CT scan system, eliminates pendulum position eccentric.
In the embodiment of the present invention, first, the rotation of the region of interest centers and CT scan system of scanned human body is calculated
The vertical drop at center.Secondly, according to the vertical drop, the scanning bed vertical height of the CT scan system is adjusted
Degree, it is eccentric to eliminate pendulum position.The embodiment of the present invention is being scanned the rotation of the region of interest centers of human body not with CT scan system
Turn center superposition, adjust scanning bed vertical height, eliminate pendulum position bias, the final quality for causing scan image is improved.
In addition, when area-of-interest is the heart or heart near zone of human body, the embodiment of the present invention can also be eliminated
Put position eccentric, improve temporal resolution, it is final so that the scan image Quality advance of heart.
It is a kind of apparatus structure schematic diagram for eliminating pendulum position bias provided in an embodiment of the present invention, the dress with reference to Figure 11
Putting to include：
Computing module 1101, for calculating the region of interest centers of scanned human body and the pivot of CT scan system
Vertical drop；
Adjusting module 1102, for according to the vertical drop, adjusting the scanning bed vertical of the CT scan system
Highly, it is eccentric to eliminate pendulum position.
Wherein, the computing module can include：
First scanning submodule, the entire scope for when the area-of-interest of the scanned human body being people's body section
When, the people's body section for being scanned human body is carried out after plain film lateral projection scanning, the plain film life data of people's body section are obtained；
First determination sub-module, for giving birth to data according to the plain film, determines the corresponding inspection of barycenter of people's body section
Survey device passage；
First judging submodule, the central passage detector channel corresponding with the barycenter for judging the detector
The distance between whether be more than predetermined threshold value；
Second determination sub-module, for when the result of first judging submodule is to be, determining people's body section
Barycenter deviate the deviation angle of the pivot；
First calculating sub module, for according to the deviation angle, calculating the barycenter of people's body section and the rotation
The vertical drop at center.
In addition, the computing module can also include：
Second scanning submodule, the entire scope for when the area-of-interest of the scanned human body being people's body section
When, the people's body section for being scanned human body is carried out after plain film lateral projection scanning, the plain film image of people's body section is obtained；
3rd determination sub-module, for according to the plain film image, determining people's body section of the scanned human body most
The vertical height of high point；
Second calculating sub module, for the peak according to people's body section vertical height and minimum point it is vertical
Highly, the vertical height at the center of people's body section is calculated, the center of people's body section is the highest of people's body section
The midpoint of point and minimum point, or be the centroid position of the pixel between the peak and the minimum point；
3rd calculating sub module, vertical height and the CT scan system that prestores for the center that calculates people's body section
Pivot vertical height difference.
Specifically, the computing module can include：
4th calculating sub module, the subrange for when the area-of-interest of the scanned human body being people's body section
When, according to the posting of scanned human body, calculate the vertical height at the center of the area-of-interest of the scanned human body；
5th calculating sub module, vertical height and the CT scan system that prestores for the center that calculates the area-of-interest
The difference of the vertical height of the pivot of system.
In practical application, the computing module can include：
3rd scanning submodule, for being heart or heart near zone when the area-of-interest of the scanned human body
When, the people's body section for being scanned human body is carried out after plain film lateral projection scanning, the plain film image of people's body section is obtained；
Submodule is handled, for carrying out image dividing processing to the plain film image, the area-of-interest correspondence is obtained
Image；
6th calculating sub module, the vertical height of the barycenter for calculating the corresponding image of the area-of-interest, and will
The vertical height of the barycenter is defined as the vertical height at the center of the area-of-interest；
7th calculating sub module, vertical height and the CT scan system that prestores for the center that calculates the area-of-interest
The difference of the vertical height of the pivot of system.
The embodiment of the present invention is overlapped in pivot of the region of interest centers not with CT scan system of scanned human body,
The scanning bed vertical height of adjustment, eliminates pendulum position bias, and the final quality for causing scan image is improved.In addition, emerging when feeling
When interesting region is the heart or heart near zone of human body, the embodiment of the present invention can also eliminate pendulum position bias, improve the time point
Resolution, it is final so that the scan image Quality advance of heart.
For device embodiment, because it corresponds essentially to embodiment of the method, so related part is real referring to method
Apply the part explanation of example.Device embodiment described above is only schematical, wherein described be used as separating component
The unit of explanation can be or may not be physically separate, and the part shown as unit can be or can also
It is not physical location, you can with positioned at a place, or can also be distributed on multiple NEs.Can be according to reality
Selection some or all of module therein is needed to realize the purpose of this embodiment scheme.Those of ordinary skill in the art are not
In the case of paying creative work, you can to understand and implement.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
The elimination pendulum position partial method and device provided above the embodiment of the present invention is described in detail, herein
Apply specific case to be set forth the principle and embodiment of the present invention, the explanation of above example is only intended to help
Understand the method and its core concept of the present invention；Simultaneously for those of ordinary skill in the art, according to the thought of the present invention,
It will change in specific embodiments and applications, in summary, this specification content should not be construed as to this
The limitation of invention.
Claims (2)
1. a kind of eliminate the eccentric method in pendulum position, it is characterised in that methods described includes：
By the plain film lateral projection for the area-of-interest for being scanned human body, region of interest centers is positioned, and calculate institute
Region of interest centers and the vertical drop of the pivot of CT scan system are stated, it is eccentric as the region of interest centers
Distance；
According to the vertical drop, the scanning bed vertical height of the CT scan system is adjusted, it is eccentric to eliminate pendulum position；
Wherein, when the area-of-interest of the scanned human body is the entire scope of people's body section, the calculating sense is emerging
Interesting regional center and the vertical drop of the pivot of CT scan system, including：
The people's body section for being scanned human body is carried out after plain film lateral projection scanning by detector, the flat of people's body section is obtained
Piece gives birth to data；Data are given birth to according to the plain film, the corresponding detector channel of barycenter of people's body section is determined；Judge the inspection
Survey whether the distance between central passage detector channel corresponding with the barycenter of device is more than predetermined threshold value, if it is,
Determine that the barycenter of people's body section deviates the channel number of the pivot；According to the channel number, the people is calculated
The vertical drop of the barycenter of body section and the pivot；
Or, when the area-of-interest of the scanned human body is the entire scope of people's body section, the calculating sense is emerging
Interesting regional center and the vertical drop of the pivot of CT scan system, including：
The people's body section for being scanned human body is carried out after plain film lateral projection scanning, the plain film image of people's body section is obtained；Root
According to the plain film image, the vertical height of the peak of people's body section of the scanned human body is determined；It is disconnected according to the human body
The vertical height of the peak in face and the vertical height of minimum point, calculate the vertical height at the center of people's body section, institute
State the midpoint of the center of people's body section for the highs and lows of people's body section, or for the peak with it is described most
The centroid position of pixel between low spot；The CT scan system for calculating the vertical height at the center of people's body section and prestoring
Pivot vertical height difference；
Or, when the area-of-interest of the scanned human body is the subrange of people's body section, the calculating sense is emerging
Interesting regional center and the vertical drop of the pivot of CT scan system, including：
According to the posting of scanned human body, the vertical height of the region of interest centers of the scanned human body is calculated；Calculate
The difference of the vertical height of the pivot of the vertical height of the region of interest centers and the CT scan system prestored；
Or, when the area-of-interest of the scanned human body is heart or heart near zone, the calculating is scanned people
The region of interest centers of body and the vertical drop of the pivot of CT scan system, including：
The people's body section for being scanned human body is carried out after plain film lateral projection scanning, the plain film image of people's body section is obtained；It is right
The plain film image carries out image dividing processing, obtains the corresponding image of the area-of-interest；Calculate the area-of-interest
The vertical height of the barycenter of corresponding image, and the vertical height of the barycenter is defined as to the center of the area-of-interest
Vertical height；The vertical height for calculating the center of the area-of-interest is vertical with the pivot of CT scan system that prestores
The difference of height.
2. a kind of eliminate the eccentric device in pendulum position, it is characterised in that described device includes：
Computing module, for the plain film lateral projection of the area-of-interest by being scanned human body, is carried out to region of interest centers
Positioning, and the region of interest centers and the vertical drop of the pivot of CT scan system are calculated, it is emerging as the sense
The eccentric distance of interesting regional center；
Adjusting module, for according to the vertical drop, the scanning bed vertical height of the CT scan system being adjusted, to disappear
Except pendulum position is eccentric；
Wherein, the computing module includes：
First scanning submodule, for when the area-of-interest of the scanned human body is the entire scope of people's body section, leading to
Cross detector to carry out after plain film lateral projection scanning the people's body section for being scanned human body, obtain the plain film life number of people's body section
According to；First determination sub-module, for giving birth to data according to the plain film, determines that the corresponding detector of barycenter of people's body section leads to
Road；Between first judging submodule, the central passage detector channel corresponding with the barycenter for judging the detector
Distance whether be more than predetermined threshold value；Second determination sub-module, for first judging submodule result for be when, really
The barycenter of fixed people's body section deviates the deviation angle of the pivot；First calculating sub module, for according to described inclined
Digression degree, calculates the barycenter of people's body section and the vertical drop of the pivot；
Or, the computing module includes：
Second scanning submodule, it is right for when the area-of-interest of the scanned human body is the entire scope of people's body section
People's body section of scanned human body is carried out after plain film lateral projection scanning, obtains the plain film image of people's body section；3rd determines
Submodule, for according to the plain film image, determining the vertical height of the peak of people's body section of the scanned human body；The
Two calculating sub modules, for the vertical height and the vertical height of minimum point of the peak according to people's body section, are calculated
The vertical height at the center of people's body section, the center of people's body section is the highs and lows of people's body section
Midpoint, or be the centroid position of pixel between the peak and the minimum point；3rd calculating sub module, is used for
The difference of the vertical height of the pivot of CT scan system for calculating the vertical height at the center of people's body section and prestoring；
Or, the computing module includes：
4th calculating sub module, for when the area-of-interest of the scanned human body is the subrange of people's body section, root
According to the posting of scanned human body, the vertical height of the region of interest centers of the scanned human body is calculated；5th calculates son
Module, for calculating the vertical height of the region of interest centers and the vertical height of the pivot of CT scan system prestored
The difference of degree；
Or, the computing module includes：
3rd scanning submodule, it is right for when the area-of-interest of the scanned human body is heart or heart near zone
People's body section of scanned human body is carried out after plain film lateral projection scanning, obtains the plain film image of people's body section；Handle submodule
Block, for carrying out image dividing processing to the plain film image, obtains the corresponding image of the area-of-interest；6th calculates son
Module, the vertical height of the barycenter for calculating the corresponding image of the area-of-interest, and by the vertical height of the barycenter
It is defined as the vertical height at the center of the area-of-interest；7th calculating sub module, for calculating the area-of-interest
The difference of the vertical height of the pivot of the vertical height at center and the CT scan system prestored.
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| CN104287759B (en) * | 2013-07-16 | 2018-01-16 | 上海联影医疗科技有限公司 | CT scan imaging method |
| CN104771184B (en) * | 2014-01-15 | 2018-11-30 | 上海联影医疗科技有限公司 | CT scan imaging method |
| CN109171790B (en) * | 2018-09-26 | 2022-03-15 | 东软医疗系统股份有限公司 | CT scanning data processing method and device and CT machine |
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| CN104000588A (en) * | 2013-02-21 | 2014-08-27 | 上海联影医疗科技有限公司 | Method and system for positioning patient in medical device |
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| DE102004052281B4 (en) * | 2004-10-27 | 2012-07-05 | Siemens Ag | Adjustment device and adjustment method for a tomography device |
| CN102805643A (en) * | 2011-05-31 | 2012-12-05 | 上海西门子医疗器械有限公司 | System for compensating bending of inspection bed |
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| US4481657A (en) * | 1981-06-01 | 1984-11-06 | Siemens Aktiengesellschaft | Patient support apparatus comprising a rotatable support |
| CN104000588A (en) * | 2013-02-21 | 2014-08-27 | 上海联影医疗科技有限公司 | Method and system for positioning patient in medical device |
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