CN104306014A

CN104306014A - Digital upgrade device for film-type panoramic dental X-ray apparatus

Info

Publication number: CN104306014A
Application number: CN201410570688.7A
Authority: CN
Inventors: 刘有军; 陆建荣; 崔少飞; 赵夕; 梁洪
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2014-10-22
Filing date: 2014-10-22
Publication date: 2015-01-28
Anticipated expiration: 2034-10-22
Also published as: CN104306014B

Abstract

The invention relates to a digital upgrade device for a film-type panoramic dental X-ray apparatus and belongs to the technical field of digitalization of medical instruments. The digital upgrade device comprises a film cartridge speed scanner, a TDI CCD (time delayed and integration, charge coupled devices) based X-ray detector, a video signal AD (analog to digital) conversion uploader, a PC (personal computer) display platform and a power source. The film cartridge speed scanner is used for scanning movement of a scanning film cartridge of the existing film-type panoramic dental X-ray apparatus; a scanned speed signal is transmitted to the TDI CCD based X-ray detector; a processed movement signal drives internal charge of a sensor TDI CDD to transit; an output signal of the X-ray detector enters the video signal AD conversion uploader and is subjected to analog-to-digital conversion and transmitted to the PC display platform; the PC display platform stores and displays a file subjected to analog-to-digital conversion. The digital upgrade device has the advantages that the domestic existing film-type dental panoramic apparatus is digitally upgraded, cost is saved, and cooperation with domestic manufacturers of existing film-type dental panoramic apparatuses to provide technical support is available.

Description

A kind of digitized update device of film type panorama gear division X-ray machine

Technical field

The present invention relates to a kind of digitized update device of X-ray machine, particularly a kind of digitized update device of film type panorama gear division X-ray machine.

Background technology

Gear division panorama x-ray imaging device is widely used imaging device in hospital's oral cavity diagnosis, can take human body denture, obtains the layer radiography image of tooth, periodontal tissue and adjacent anatomical structures thereof.According to the difference of x-ray receptor, gear division panorama x-ray imaging device can be divided into film cassette formula x-ray panorama machine, IP board-like imaging x-ray panorama machine and charge-coupled image sensor formula x-ray panorama machine.Film cassette formula x-ray panorama machine is the most traditional imaging mode, and it is made up of intensifying screen, photographic film and magazine, needs to obtain image, complicated operation and have certain chemical contamination through development, step that is fixing, that rinse and dry; IP board-like imaging x-ray panorama machine belongs to a kind of imaging mode indirectly, needs to obtain digital picture by laser scanner by after the scanning of IP plate, although improve efficiency without the need to developing a film, operation is still complicated, length consuming time, and radiation dose is large; Digitized x-ray panorama machine can be directly changed into view data the x-ray received, and without the need to darkroom chemical treatment, image taking speed is fast, imaging resolution is higher, and radiation dose is less.

At present, domestic gear division panorama x-ray imaging device is in the stage of update, and being digitized into similarly is the trend developed, and large, medium and small hospital mainly takes the mode of external import, and most small-middle hospital still uses traditional film cassette formula x-ray panorama machine.The digitized update device of X-ray machine provided by the invention can carry out digitized upgrading to domestic existing film cassette formula x-ray panorama machine or IP board-like imaging x-ray panorama machine, cost-saving greatly.

Summary of the invention

For carrying out digitized upgrading to existing hospital film type panorama gear division X-ray machine, it is characterized in that: comprise film magazine velocity scanning device, based on the x-ray detector of TDI CCD, video signal AD conversion uploads device, PC display platform and power supply; The motion of existing film type panorama gear division X-ray machine scanning film magazine is scanned with film magazine velocity scanning device, then the rate signal that scanning obtains is passed to the x-ray detector based on TDI CCD, its acp chip CPLD processes for motor message, and concrete treating method is realized by CPLD inside programming.The motor message that grating scale exports is pulse signal, is specifically that mechanical film magazine 4um grating scale of often passing by exports a pulse; The pixel of CCD is 48*48um, and namely the transfer of CCD internal charge is once passed by 48um, so only makes the film magazine 48um that often passes by produce a pulse-triggered CCD Charger transfer once, the Charger transfer of film movements and CCD just can be made synchronous.Treating method directly outputs signal grating scale exactly carries out 12 times of countings, makes grating scale trigger impulse become 48um pulse from original 4um pulse; Secondly what adopt due to film magazine motion is motor, then must have shake, make grating scale output signal the interference of being shaken like this, and such signal handler part also will have one to disappear to tremble module.The transfer of the then internal charge of driving sensor TDI CCD of the motor message after process, film magazine motor message driven CCD internal signal is shifted, then need the controlled input retaining transfer gate-control signal while CPLD programming produces CCD drive singal, all the other ccd signal drivers are then as conventional definite integral driver (Liu Youjun, Lu Jianrong, Liu Rongli, Yu Ran. the TDI-CCD drive circuit that the time of integration is adjustable: China, utility model patent .201120323369.8 [p] .2012.), film movements signal control CCD electric charge vertical transitions, to reach the object that motion mates completely with TDI CCD Charger transfer, thereafter the tooth useful signal that x-ray detector exports enters video signal AD conversion and uploads device and carry out the analog digital conversion of signal and be transferred to PC platform, and PC platform carries out the storage of bmp form to the bin file obtained after analog digital conversion and shows, power supply provides required voltage for the digitized update device of whole film type panorama gear division X-ray machine.

The digitized update device of film type panorama gear division X-ray machine provided by the invention meets clinical diagnosis requirement, digitized upgrading can be carried out to domestic existing film or IP board-like gear division panorama machine, and have pollution-free, image taking speed is fast, the advantages such as image level is abundanter, the film type panorama gear division X-ray machine that can be directly used in small-middle hospital improves, greatly cost-saving.

Panorama gear division X-ray machine is based on pantomography principle design, pantomography is the anatomic characteristic according to gear division Maxillary region, utilize layer radiography principle and slit photography principle and method for imaging that denture can be projected on a film by a kind of single exposure of designing (Han Feng talks, Zhu Xianfeng. Medical imaging equipments (the 2nd edition) [M]. Beijing: People's Health Publisher, 2010:12-37), so just requiring that the motion of film type oral panorama X-ray apparatus film magazine must be mated mutually with the rotation of C-arm just can make imaging point on the dental arch curve of people, the teeth oral cavity panorama sketch only in this way obtained could be clear.The digitized upgrading that the present invention mentions, its core adopts TDI CCD as photoelectric sensor exactly, directly the x-ray of reception can be changed into the signal of telecommunication, the design then requires that speed that TDI CCD internal signal shifts is consistent with the translational speed of film can make device of the present invention mate completely with improved panorama gear division X-ray machine, thus obtains clearly digitized image.Therefore adopt the motion of grating scale scan film, and then trigger the transfer of TDI CCD internal signal, make CCD Charger transfer speed and film movements speed completely the same.

The grating scale output signal cycle is time of its inspected object motion 4um, and namely film 4um grating scale of often passing by exports a complete pulse, adds that mechanical movement has the possibility of shake, first will carry out de-jitter like this for the grating scale signal directly obtained.The distance 48um that then at every turn will shift according to the electric charge of TDI CCD afterwards carries out 12 times of countings to grating scale output signal, so just, make the film 48um that often moves export a pulse signal, pulse signal is then used for triggering the Charger transfer of TDI CCD internal signal, reaches film and TDICCD moves completely the same; Key dithering and counting process are realized by CPLD chip programming.

Existing film cassette formula x-ray panorama machine or IP board-like imaging x-ray panorama machine are carried out digitized upgrading tool and have the following advantages and beneficial effect by the present invention: the digitized update device of panorama gear division X-ray machine provided by the invention makes that X-ray exposure dosage is little, exposure latitude large, wide etc. without the need to implying chemical treating process, without the need to laser scanner, dynamic range of images.And the digitized update device of panorama gear division X-ray machine provided by the invention directly can carry out digitized upgrading to domestic existing film cassette formula x-ray panorama machine or IP board-like imaging x-ray panorama machine, greatly save cost, and make original film type, IP plate is that gear division oral panorama X-ray apparatus is recycled, and meets the trend of medical digitisation video.

Accompanying drawing explanation

Fig. 1 is the structured flowchart of the digitized update device of X-ray machine provided by the invention.

Fig. 2 is film type gear division oral panorama X-ray apparatus simple diagram and grating scale fixed form schematic diagram.

Fig. 3 is grating scale schematic diagram.

Fig. 4 is the x-ray detector schematic diagram based on TDI CCD.

Fig. 5 is signal processing circuit.

Fig. 6 is TDI CCD drive singal schematic diagram.

Fig. 7 is high-speed data acquisition card FCFR-USB9825 schematic diagram.

In figure: 1. elevator carriage; 2. rotate transverse arm; 3. film magazine; 4. grating scale position; 6. magnetic grid bar; 7. read head; 8.X line occurring source.

Detailed description of the invention

The digitized update device of film type panorama gear division X-ray machine provided by the invention comprises film magazine velocity scanning device, and based on the x-ray detector of TDI CCD, video signal AD conversion uploads device, PC display platform and power supply.The structured flowchart of the digitized update device of film type panorama gear division X-ray machine as shown in Figure 1.Comprise five parts, film magazine velocity scanning device, adopt grating scale as core scanning film magazine movement velocity; Based on the x-ray sniffer of TDI CCD, the main CPLD of employing inside programming realizes: process grating scale transmission speed signal, CCD driver' s timing etc.; Video signal AD conversion uploads device, the analog digital conversion of main settling signal, the work such as host computer transmission; PC shows, and realizes the work such as image display, storage of computer; Power supply, supplies each road modular power source.

Film magazine velocity scanning device forms primarily of grating scale, the film movements of logical grating scale scan film formula panorama gear division X-ray machine obtains its rate signal, detailed description of the invention adopts grating scale to be fixed on film type panorama gear division X-ray machine frame for movement film magazine position as shown in Figure 2, grating ruler reading head is fixed on C type turning arm, grating scale magnetic grid bar is fixed on film magazine position, thus making it move with film magazine, grating scale is as shown in Figure 3.Read head reads film movements and exports its rate signal U1, and rate signal U1 feeds the x-ray detector based on TDI CCD.

Fig. 2 comprises eight parts, and elevator carriage 1 is mainly used in the lifting of frame for movement; Rotate transverse arm 2, be C-arm, carrying x-ray occurs and receiving system; Film magazine 3, for the film of film type X-ray machine loads; Grating scale position 4 is the general installation site of grating scale; Magnetic grid bar 6, is grating scale magnetic grid bar, is installed on film magazine and is marked with scale, for speed calculation; Read head 7, is grating ruler reading head, read head is inswept magnetic grid bar 6, obtains rate signal by scale inswept in the unit interval; X-ray occurring source 8, for generation of x-ray.X-ray detector schematic diagram as shown in Figure 4, its acp chip EMP7512 programmes and produces CCD drive singal, drive singal is as Fig. 6, the drive singal that TDI-CCD needs comprises eight road vertical transfer clocks and (is designated as P1AVa, P1BVa, P2AVa, P2BVa, P1AVb, P1BVb, P2AVb, P2BVb), eight tunnel horizontal transfer clock (P1AHa, P1BHa, P2AHa, P2BHa, P1AHb, P1BHb, P2AHb, P2BHb), two-way reset pulse (being designated as RGa and RGb), two-way transfer gate-control signal (being designated as TGa and TGb), and two-way summation gate-control signal (being designated as SGa and SGb), controlling gate-control signal TG can the Charger transfer of control CCD.Thereafter processed for the output signal U 1 of grating scale by programming, process comprises 12 times of countings of common signal and disappears and tremble process.

X-ray detector also comprises TDI ccd output signal treatment circuit, treatment circuit adopts conventional correlated-double-sampling principle design (Zhang Lin, Li Yongxin, schoolmate recklessly. the CCD video frequency signal processing based on Correlated Double Sampling studies [J]. aerospace measurement technology, 2007,27 (2): 34-37.), in order to remove reset noise to TDI ccd output signal.Primarily of a slice CDS-1402 and two potentiometer R1, R2 composition.Described signal U2 connects 3,4 pins of CDS-1402 respectively; 1 pin of CDS-1402 chip and 9 pins meet potentiometer R1, a R2 respectively for compensating adjustment to input voltage.11,12 pins of CDS-1402 connect SHP and the SHD signal of EPM7512 respectively, described signal U2 is sampled, keep after carried the signal High of TDI ccd output signal datum information and the signal Low of signal level information respectively.7,8 pins of CDS1402 chip are connected, and 6 feet are connected with 8 feet through potentiometer R3, make two paths of signals High and Low carry out difference operation, are only carried the output signal U 3 of pixel signal amplitude information in TDI ccd output signal, export next stage to by 22 feet.

Video signal AD conversion uploads device, adopts the functions such as existing high-speed data acquisition card FCFR-USB9825 carries out AD conversion to ccd output signal, FIFO stores, data USB uploads; X-ray detector output signal U3 accesses capture card input, the inner principle of capture card as shown in Figure 7, signal is transferred to host computer by USB after the collection, process of capture card, PC is received the data programing that data collecting card sends and is carried out the display of image, and is stored as medical bmp formatted file.

Claims

1. the digitized update device of a film type panorama gear division X-ray machine, for carrying out digitized upgrading to existing hospital film type panorama gear division X-ray machine, it is characterized in that: comprise film magazine velocity scanning device, based on the x-ray detector of TDI CCD, video signal AD conversion uploads device, PC display platform and power supply; The motion of existing film type panorama gear division X-ray machine scanning film magazine is scanned with film magazine velocity scanning device, then the rate signal that scanning obtains is passed to the x-ray detector based on TDI CCD, its acp chip CPLD processes for motor message, being realized by CPLD inside programming: the motor message that grating scale exports is pulse signal, is specifically that mechanical film magazine 4um grating scale of often passing by exports a pulse; The pixel of CCD is 48*48um, and namely the transfer of CCD internal charge is once passed by 48um, so only makes the film magazine 48um that often passes by produce a pulse-triggered CCD Charger transfer once, the Charger transfer of film movements and CCD just can be made synchronous; Treating method directly outputs signal grating scale exactly carries out 12 times of countings, makes grating scale trigger impulse become 48um pulse from original 4um pulse; Secondly what adopt due to film magazine motion is motor, then must have shake, make grating scale output signal the interference of being shaken like this, and such signal handler part also will have one to disappear to tremble module; The transfer of the then internal charge of driving sensor TDI CCD of the motor message after process, film magazine motor message driven CCD internal signal is shifted, then need the controlled input retaining transfer gate-control signal while CPLD programming produces CCD drive singal, all the other ccd signal drivers are then as conventional definite integral driver, film movements signal control CCD electric charge vertical transitions, to reach the object that motion mates completely with TDI CCD Charger transfer; Thereafter the tooth useful signal that x-ray detector exports enters video signal AD conversion and uploads device and carry out the analog digital conversion of signal and be transferred to PC platform, and PC platform carries out the storage of bmp form to the bin file obtained after analog digital conversion and shows; Power supply provides required voltage for the digitized update device of whole film type panorama gear division X-ray machine.

2. the digitized update device of film type panorama gear division X-ray machine as claimed in claim 1, it is characterized in that: described film magazine velocity scanning device adopts the motion of grating scale to film to scan, the film movements rate signal that film type X-ray machine is provided that like this can be real-time, and the Charger transfer of TDI CCD inside is triggered by motor message, whole system is mated mutually, obtains digital picture clearly; Magnetic grid bar is fixed on the film magazine of X-ray machine, and grating ruler reading head is then fixed in X-ray machine C-arm, and such film magazine drives magnetic grid bar and read head to have a relative motion, and such grating scale just can scan the movement velocity of film magazine.

3. the digitized update device of film type panorama gear division X-ray machine as claimed in claim 1, it is characterized in that: the motor message that described film magazine velocity scanning device obtains has shake because film type mechanical movement has the motor message that tremor makes directly to obtain, so just, need the acp chip CPLD of the x-ray detector after film magazine velocity scanning device to carry out de-jitter by programming to film magazine motor message, dithering process is realized by CPLD chip programming, disappears and trembles the common key jitter treating method of process reference.

4. the digitized update device of film type panorama gear division X-ray machine as claimed in claim 1, it is characterized in that: the x-ray detector based on TDI CCD comprises drive singal part and the ccd output signal processing section of TDI CCD, the CCD pixel of the described x-ray detector based on TDI CCD is 48*48um, therefore CCD electric charge often shifts the 48um that once passes by, and grating scale provides a pulse every 4um in film magazine velocity scanning device, like this for making film often move 48um to trigger CCD transfer once, then need to carry out 12 countings to grating scale signal, namely film often walks 48um to CCD transfer pulse, counting is realized by CPLD chip programming.

5. the digitized update device of film type panorama gear division X-ray machine as claimed in claim 1, is characterized in that: the described x-ray detector based on TDI CCD, directly the x-ray of reception can be changed into the signal of telecommunication; And design TDI CCD drive singal can make the Charger transfer of TDI CCD be carried out the control of external trigger the time of integration by exterior mechanical motion impulse signal, concrete enforcement adds conditional statement on the basis of former CCD drive singal program, make CCD electric charge vertical transitions gate-control signal can external trigger, and on hardware circuit reserved external control signal input port.