CA2797240A1 - Malignant mass detection and classification in radiographic images - Google Patents

Malignant mass detection and classification in radiographic images Download PDF

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Publication number
CA2797240A1
CA2797240A1 CA2797240A CA2797240A CA2797240A1 CA 2797240 A1 CA2797240 A1 CA 2797240A1 CA 2797240 A CA2797240 A CA 2797240A CA 2797240 A CA2797240 A CA 2797240A CA 2797240 A1 CA2797240 A1 CA 2797240A1
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Prior art keywords
image
anomaly
computer program
areas
pixel
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CA2797240A
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French (fr)
Inventor
Jeffrey C. Wehnes
James H. Pike
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Vucomp Inc
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Vucomp Inc
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Publication of CA2797240A1 publication Critical patent/CA2797240A1/en
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00Image analysis
    • G06T7/0002Inspection of images, e.g. flaw detection
    • G06T7/0012Biomedical image inspection
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00Pattern recognition
    • G06F18/20Analysing
    • G06F18/24Classification techniques
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T5/00Image enhancement or restoration
    • G06T5/10Image enhancement or restoration by non-spatial domain filtering
    • G06T5/70
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00Image analysis
    • G06T7/10Segmentation; Edge detection
    • G06T7/11Region-based segmentation
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00Image analysis
    • G06T7/10Segmentation; Edge detection
    • G06T7/143Segmentation; Edge detection involving probabilistic approaches, e.g. Markov random field [MRF] modelling
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06VIMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00Arrangements for image or video recognition or understanding
    • G06V10/40Extraction of image or video features
    • G06V10/44Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersections; Connectivity analysis, e.g. of connected components
    • G06V10/443Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersections; Connectivity analysis, e.g. of connected components by matching or filtering
    • G06V10/449Biologically inspired filters, e.g. difference of Gaussians [DoG] or Gabor filters
    • G06V10/451Biologically inspired filters, e.g. difference of Gaussians [DoG] or Gabor filters with interaction between the filter responses, e.g. cortical complex cells
    • G06V10/454Integrating the filters into a hierarchical structure, e.g. convolutional neural networks [CNN]
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00Indexing scheme for image analysis or image enhancement
    • G06T2207/10Image acquisition modality
    • G06T2207/10116X-ray image
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00Indexing scheme for image analysis or image enhancement
    • G06T2207/20Special algorithmic details
    • G06T2207/20016Hierarchical, coarse-to-fine, multiscale or multiresolution image processing; Pyramid transform
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00Indexing scheme for image analysis or image enhancement
    • G06T2207/30Subject of image; Context of image processing
    • G06T2207/30004Biomedical image processing
    • G06T2207/30068Mammography; Breast
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00Indexing scheme for image analysis or image enhancement
    • G06T2207/30Subject of image; Context of image processing
    • G06T2207/30004Biomedical image processing
    • G06T2207/30096Tumor; Lesion

Abstract

An image analysis embodiment comprises subsampling a digital image by a subsample factor related to a first anomaly size scale, thereby generating a subsampled image, smoothing the subsampled image to generate a smoothed image, determining a minimum negative second derivative for each pixel in the smoothed image, determining each pixel having a convex down curvature based on a negative minimum negative second derivative value for the respective pixel, joining each eight-neighbor connected pixels having convex down curvature to identify each initial anomaly area, selecting the initial anomaly areas having strongest convex down curvatures based on a respective maximum negative second derivative for each of the initial anomaly areas, extracting one or more classification features for each selected anomaly area, and classifying the selected anomaly areas based on the extracted one or more classification features.

Claims (20)

1. A method for identifying anomalies in an image comprising pixels, the method comprising:

subsampling a digital image by a subsample factor related to a first anomaly size scale, thereby generating a subsampled image;

smoothing the subsampled image to generate a smoothed image;

determining a minimum negative second derivative for each pixel in the smoothed image;
determining each pixel having a convex down curvature based on a negative minimum negative second derivative value for the respective pixel;

joining each eight-neighbor connected pixels having convex down curvature to identify each initial anomaly area;

selecting the initial anomaly areas having strongest convex down curvatures based on a respective maximum negative second derivative for each of the initial anomaly areas;
extracting one or more classification features for each selected anomaly area;
and classifying the selected anomaly areas based on the extracted one or more classification features.
2. The method of claim 1, wherein the image is a mammogram, the anomalies are potentially-malignant masses, and the one or more classification features are selected from the group consisting of: search width index, nipple distance and y position, signal-to-noise ratio (SNR), object rank, relative arc length, dip SNR, global SNR, other side SNR, and combinations thereof.
3. The method of claim 1, further comprising repeating the method for a plurality of different anomaly size scales.
4. The method of claim 1, further comprising, before subsampling, removing bright areas from the digital image.
5. The method of claim 4, further comprising, after removing the bright areas and before subsampling, flattening an intensity of the digital image.
6. The method of claim 1, wherein determining the minimum negative second derivative for each pixel comprises:

calculating second derivatives at three image points centered at a respective pixel and linearly spaced at a large scale; and repeating calculating second derivatives for a plurality of orientations around the respective pixel.
7. The method of claim 1, further comprising building a noise map of the smoothed image by:

calculating second derivatives at three image points centered at a respective pixel and linearly spaced at a fine scale;

repeating calculating second derivatives for a plurality of orientations around the respective pixel; and using a minimum absolute second derivative from the plurality of orientations as a noise map value for the respective pixel.
8. The method of claim 1, further comprising, after joining and before selecting, eroding and dilating each initial anomaly area.
9. The method of claim 1, further comprising, before extracting, refining a boundary of each selected initial anomaly area.
10. A system for identifying anomalies in an image comprising pixels, the system comprising:

an image subsampler subsampling a digital image, generating a subsampled image;
an image smoother smoothing the subsampled image, generating a smoothed image;

a curvature signature detector detecting and joining neighboring convex down curvatures in the smoothed image, generating anomaly areas;

an anomaly selector selecting the anomaly areas having strongest convex down curvatures, generating selected anomaly areas;

a feature extractor extracting one or more classification features for each of the selected anomaly areas; and a classifier classifying the selected anomaly areas based on one or more thresholds for the respective extracted one or more classification features.
11. The system of claim 9, wherein the image is a mammogram, the anomalies are potentially-malignant masses, and the one or more classification features are selected from the group consisting of: search width index, nipple distance and y position, signal-to-noise ratio (SNR), object rank, relative arc length, dip SNR, global SNR, other side SNR, and combinations thereof.
12. The system of claim 9, wherein the image sampler uses a subsample factor related to a first anomaly size scale.
13. The system of claim 9, wherein the curvature detector determines a minimum negative second derivative for each pixel in the smoothed image, and detects convex down curvature based on a negative minimum negative second derivative value for each pixel in the smoothed image.
14. The system of claim 9, wherein the anomaly selector determines the strongest convex down curvatures based on a maximum negative second derivative for each of the anomaly areas.
15. A computer program product for identifying anomalies, the computer program product having a non-transitory computer-readable medium with a computer program embodied thereon, the computer program comprising:

computer program code for subsampling a digital image by a subsample factor related to a first anomaly size scale, thereby generating a subsampled image;

computer program code for smoothing the subsampled image to generate a smoothed image;

computer program code for determining a minimum negative second derivative for each pixel in the smoothed image;

computer program code for determining each pixel having a convex down curvature based on a negative minimum negative second derivative value for the respective pixel;
computer program code for joining each eight-neighbor connected pixels having convex down curvature to identify each initial anomaly area;

computer program code for selecting the initial anomaly areas having strongest convex down curvatures based on a respective maximum negative second derivative for each of the initial anomaly areas;

computer program code for extracting one or more classification features for each selected anomaly area; and computer program code for classifying the selected anomaly areas based on the extracted one or more classification features.
16. The computer program product of claim 1, wherein the image is a mammogram, the anomalies are potentially-malignant masses, and the one or more classification features are selected from the group consisting of: search width index, nipple distance and y position, signal-to-noise ratio (SNR), object rank, relative arc length, dip SNR, global SNR, other side SNR, and combinations thereof.
17. The computer program product of claim 1, further comprising computer program code for repeating the anomaly identification for a plurality of different anomaly size scales.
18. The computer program product of claim 1, further comprising computer program code for removing bright areas from the digital image prior to subsampling.
19. The computer program product of claim 18, further comprising computer program code for flattening an intensity of the digital image prior to subsampling.
20. The computer program product of claim 1, wherein the computer program code for determining the minimum negative second derivative for each pixel comprises:

computer program code for calculating second derivatives at three image points centered at a respective pixel and linearly spaced at a large scale; and computer program code for repeating calculating second derivatives for a plurality of orientations around the respective pixel.
CA2797240A 2010-04-30 2011-04-29 Malignant mass detection and classification in radiographic images Abandoned CA2797240A1 (en)

Applications Claiming Priority (17)

Application Number Priority Date Filing Date Title
US34355710P 2010-04-30 2010-04-30
US61/343,557 2010-04-30
US34360810P 2010-05-02 2010-05-02
US34360910P 2010-05-02 2010-05-02
US34355210P 2010-05-02 2010-05-02
US61/343,608 2010-05-02
US61/343,609 2010-05-02
US61/343,552 2010-05-02
US39502910P 2010-05-06 2010-05-06
US61/395,029 2010-05-06
US39857110P 2010-06-25 2010-06-25
US61/398,571 2010-06-25
US39909410P 2010-07-07 2010-07-07
US61/399,094 2010-07-07
US40057310P 2010-07-28 2010-07-28
US61/400,573 2010-07-28
PCT/US2011/034698 WO2011137409A1 (en) 2010-04-30 2011-04-29 Malignant mass detection and classification in radiographic images

Publications (1)

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CA2797240A1 true CA2797240A1 (en) 2011-11-03

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CA2797238A Abandoned CA2797238A1 (en) 2010-04-30 2011-04-29 Microcalcification detection and classification in radiographic images
CA2797240A Abandoned CA2797240A1 (en) 2010-04-30 2011-04-29 Malignant mass detection and classification in radiographic images
CA2797266A Abandoned CA2797266A1 (en) 2010-04-30 2011-04-29 Spiculated malignant mass detection and classification in radiographic image
CA2797267A Abandoned CA2797267A1 (en) 2010-04-30 2011-04-29 Probability density function estimator

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CA2797238A Abandoned CA2797238A1 (en) 2010-04-30 2011-04-29 Microcalcification detection and classification in radiographic images

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CA2797266A Abandoned CA2797266A1 (en) 2010-04-30 2011-04-29 Spiculated malignant mass detection and classification in radiographic image
CA2797267A Abandoned CA2797267A1 (en) 2010-04-30 2011-04-29 Probability density function estimator

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US (7) US8923594B2 (en)
EP (4) EP2564355A1 (en)
JP (4) JP5927180B2 (en)
CN (4) CN102934126A (en)
CA (4) CA2797238A1 (en)
WO (4) WO2011137411A1 (en)

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