Computer-aided detection in DBT (digital breast tomosynthesis)
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1 Computer-aided detection in DBT (digital breast tomosynthesis) 2015 Summer Prof. Yong Man Ro Image and Video Systems (IVY) Lab., Department of Electrical Engineering, KAIST
2 IVY Lab (Image Video System. YM Ro Lab) 2/31 Research history Image Processing and Recognition Low Bits rate coding Content basedimage indexing, Image indexing semantic features Image/video classification D video contents based analysis Image/Video Filtering Scalable Video Coding Face/Expression recognition MRI Imaging 1997 Image processing for color deficiency and low vision Computer aided detection (mammography, U-sound) ivylab.kaist.ac.kr 104 SCI indexed papers, 242 International conference papers 11 MPEG standard technologies Spin off: Image filtering system, Color adaptation
3 Current Research activities 3/31
4 Amount of health care data (exabyte) Medical images and size 4/31 Explosion of medical data Expectation for growth of health care data in U.S. 150 exabytes in %-40% * 1 exabyte (EB) = 10 6 terabytes (TB) * Portion of medical image: about 80% 1,600 exabytes ( 1.6 zettabytes) in 2020 Year How Annual can handle increase the in big data? medical image archives Projection views 2048 x 1664 x 15 x 2 bytes = 98 MB 3D mammograms MB - Mammograms 2.6GB - 3D mammograms (tomosynthesis) 65 4 (98+563) = 2.6 GB (4 volumes per patient) 2457 Reconstructed slices 2457 x 1847 x 65 x 2 bytes = 563 MB W. Raghupathi and V. Raghupathi, Big data analyrics in healthcare: promise and potential, Health Information Science and System, SAP's Amit Sinha, Big data's challenges and solutions towards producing real-time personalized medicine, Strata Rx 2013 conference
5 Cancer diagnosis with medical images 5/31 General procedure for breast cancer screening Mammography Mammography * Double reading, which is standard practice in the UK, significantly improves the sensitivity and specificity First reading Second reading Computer aided detection (CAD) can replace the second reader Uncertain case Increasing throughput and effectiveness of the screening Additional imaging: breast ultrasonography or MRI, etc. Breast ultrasonography MRI Breast cancer is the most cause of cancer related death on woman [1] Highly suspicious case Biopsy or follow up study E. Warner Breast cancer screening, The New England Journal of Medicine, 2011 Breast Cancer Screening - Thermography is Not an Alternative to Mammography: FDA Safety Communication, U.S. Food and Drug Administration, 2011 [1] GLOBOCAN 2012: Estimated cancer incidence, mortality and prevalence worldwide in 2012, WHO (world health organization), 2012
6 Sparse coefficient Computer-aided detection via visual recognition 6/31 Mass Normal tissue (negative Maximum class) margin Input image Preprocessing ROI detection Feature extraction Classification Decision Normal Support vectors Detected ROI candidates Feature space Mass (positive class) Example of SVM classification Subtle spiculated patterns ROI classified as a mass Apparent spiculated patterns (a) Input mammogram (b) Preprocessed mammogram Sparse representation (c) Detected ROI candidates A general framework of CAD (d) Final result to be displayed A test mass image Positive class Negative class Example of sparse representation based classification
7 Image pattern of breast cancer in mammogram 7/31 Mass Appeared more densely (brighter) than the surrounding tissues Breast masses present various margin types [1] Microcalcification Cluster of bright and small points 100 mm 1mm size ( pixels in 70 mm mammogram image) Circumscribed Ill-defined Micro-lobulated Obscured Spiculated Examples of microcalcification Examples of various margins of breast mass [1] Sylvia Heywang-Koebrunner, Ingrid Schreer, Diagnostic breast imaging, second edition, in Thieme, 2001.
8 Modality for breast cancer screening 8/31 History Film mammography (1967) Digital mammography (early 1990s-current) 3D digital breast tomosynthesis (DBT) (2011-developing) 15 Reconstruction algorithm (a) (b) (c) An illustrative example of (a) DBT acquisition geometry with (b) the projection views (15 images) acquired by the DBT (c) the reconstructed slices (50~80 images) Examples of DBT data acquisition and breast cancer screening using DBT Kontos, D. et al (2009): Parenchymal Texture Analysis in Digital Breast Tomosynthesis for Breast Cancer Risk Estimation: A Preliminary Study ; Acad Radiol; v.16:283:298. Video clips from University Hospitals (
9 2D DM vs. 3D DBT 9/31 DBT could reduce tissue overlap in Digital Mammography (DM) DBT clearly shows breast cancers 2D DM Microcalcification 3D DBT 2D DM Mass 3D DBT
10 Clinical reports: 2D vs. 2D+3D 10/31 Advantages on screening using 2D DM + 3D DBT The DBT in combination with digital mammography is approved by the Food and Drug Administration (FDA) 1) 1) US Food and Drug Administration. Selenia Dimensions 3D System P080003, Feb., 11, From Hologic Selenia Dimensions 3D System Sponsor Executive Summary
11 Image pattern of DBT reconstructed slices and projection views 11/31 More data and information projection views (PVs) + reconstructed slices (RSs) : Mass on PVs Mass on RSs MC on PVs MC on RSs
12 Limitations of DBT 12/31 PV images are noisy due to the low dose imaging RS images have reconstruction artifact (blur) Due to the limited angular range of projection views, different voxel size voxel 1-3mm 0.1mm 0.1mm y x y z DBT reconstructed slices Image resolution is highly different between XY plane and YZ or XZ plane
13 Limitations of DBT 13/31 Reconstruction artifact (blur) Mass Reconstructed slices In-focus slice Out-of-focus slice Reconstruction artifact (blur) occurred MC y y x x S. T. Kim, D. H. Kim, Y. M. Ro, Breast mass detection using slice conspicuity in 3D reconstructed digital breast volumes, Physics in Medicine and Biology, 2014.
14 High performance DBT CAD developed by IVY lab 14/31 Novelty : limitations reduction and maximum use of information from both PV and RS CAD system Input image Preprocessing Detection breast cancers on projection views Detection breast cancers on reconstructed slices ROI detection Low-dose and noisy condition Reconstruction artifact due to the Need for enhancement limited technique number of view Correlation How to effectively between combining projection Need for views the extracting results? features by 15 projection Developing views a new a ensemble feature mitigrating classifier-based 50~80 the reconstructed blur combination effect slices Feature extraction Classification CAD system Raw PVs Utilizing both projection Enhanced and reconstruction PVs data Decision W.J. Baddar, D. H. Kim, E.J. Kim, Y. M. Ro, Utilizing digital breast tomosynthesis projection views correlation for microcalcification enhancement for detection purposes, to be presented at SPIE MI, 2015
15 Conspicuousness score True Positive Fraction (TPF) Blur-free mass feature extraction for DBT CAD 15/31 Mass feature extraction in in-focus slice found automatically Finding in-focus slice automatically (Object borders in the in-focus plane are sharp) Feature extraction in estimated in-focus slice Estimated in-focus slices 320 Proposed feature extraction: Extracting features from in-focus slices only Morphology and texture features % of peak value Conventional feature extraction: Averaging features from all slices Slice Index Blurred slices Illustration for new feature extraction in in-focus slices The proposed feature extraction improves mass classification performance on DBT reconstructed slices Proposed features from conspicuous slices Conventional features False Positive Fraction (FPF) Classification ROC curve S. T. Kim, D. H. Kim, Y. M. Ro, Breast mass detection using slice conspicuity in 3D reconstructed digital breast volumes, Physics in Medicine and Biology, 2014.
16 New MC feature extraction for DBT CAD 16/31 MC feature extraction from maximum value tracing images Improves MC visibility compared with blurred MCs, thus feature can better describe MCs The MC cluster structure can be easily shown and kept intact in the traced images Tracing direction Y X Z VOI from the DBT volume Tracing the VOI of the DBT in 3 Dimensions Extracting texture features describing relation with surrounding tissue Extracting texture features describing MC cluster structure and distribution
17 Sensitivity New MC feature extraction for DBT CAD 17/ directional maximum ray-tracing features 0.3 Conventional 3D features Average number of false positive per volume Classification FROC curve The proposed feature extraction improves MC classification performance on DBT reconstructed slices E.J. Kim, D.H. Kim, E.S. Cha, and Y.M. Ro. "Improvement of subtle microcalcifications detection in DBT slices." In Biomedical and Health Informatics (BHI), 2014 IEEE-EMBS International Conference on, pp IEEE, 2014.
18 New mass feature in PVs 18/31 Consistent similarity between projection views: Utilizing different characteristics of masses and FPs on PVs FP ROI Inter-view similarity of FP Area under the RUC curve (AUC) * Higher AUC means better classification performance Mass enhanced PVs LBP (354) RLS (20) SGLD (52) GLDS (96) NRL (5) Proposed (8) Proposed+ LBP (362) Mass enhanced PVs Mass ROI Inter-view similarity of mass Mass shows higher inter-view similarities compared to FP Proposed feature shows high AUC with small number of features The concatenated features (multi-resolution LBP features [1] and proposed features ) further improved AUC performance D. H. Kim, S. T. Kim, Y. M. Ro, Feature extraction from inter-view similarity of DBT projection views, SPIE Medical Imaging, 2015 [1] J. Y. Choi and Y. M. Ro, "Multiresolution local binary pattern texture analysis combined with variable selection for application to false positive reduction in computeraided detection of breast masses on mammograms," Physics in Medicine and Biology, vol 57, no. 2, pp , October 2012
19 Maximum use of information from both PV and RS for High performance DBT CAD lab 19/31 New ensemble classification for mass CAD fusing RSs and PVs Characteristics of lesion are different in RSs and PVs Multiple classifiers with feature selection is needed to classify complex data Negative class Normal tissues Training VOIs Training Testing Testing VOIs f i Extracting all features on RSs and PVs Positive class Masses with various margins Classifier ensemble generation Information of selected features Extracting selected features on RSs and PVs Classification f 2 with ensemble classifiers Classification using base classifier 1 Classification using base classifier k Ensemble classifier (k classifiers) Weighted decision fusion f 1 3D mass detection results Weak classifier with selected feature f Strong Ensemble classification based on boosting i classifier (training and testing) D. H. Kim, S. T. Kim, Y. M. Ro, Improving mass detection using combined features from projection views and reconstructed volume of DBT and boosting based classification with feature selection, submitted to Physics in Medicine and Biology, 2014
20 Percentage of times selected (%) Sensitivity (%) Maximum use of information from both PV and RS for High performance DBT CAD lab New ensemble classification for mass CAD fusing RSs and PVs 80% of selected features Reconstructed slices Projection views Maximum improvement of sensitivity is about 15% with the combination of 2D and 3D data 20/31 0 Feature name Selected features in the boosting framework Dominant features are extracted from both on PVs and RSs PVs (2D) RSs (3D) PVs+RSs (2D+3D) False positives per breast volume Classification FROC curve D. H. Kim, S. T. Kim, Y. M. Ro, Improving mass detection using combined features from projection views and reconstructed volume of DBT and boosting based classification with feature selection, submitted to Physics in Medicine and Biology, 2014 Maximum improvement of sensitivity is about 18% with the combination of 2D and 3D data ROC curves for clinical study
21 Multiview analysis 21/31 Clinical practice Radiologists analyze the ipsilateral views to detect cancers and to reduce FPs Matching corresponding regions in the ipsilateral DBT views is important Mass have similar features in CC and MLO view CC view Ipsilateral views Right CC view RSs Right MLO view RSs
22 Matched sensitivity 22/31 Multiview analysis: Region matching in ipsilateral DBT views Geometry-based matching Feature (Local structure)- based search Left MLO view RSs Geometry-based matching Compression plate Detector MLO view compressed breast Decompress in MLO direction Left CC view RSs Uncompressed breast Compress in CC direction CC view compressed breast Proposed region matching method Geometry-based region matching method [2] D Euclidian distance between actual location of region and estimated location Accuracy of the proposed region matching method and breast compression model-based region matching method S. T. Kim, D. H. Kim, D. J. Ji, and Y. M. Ro, Region Matching based on local structure information in ipsilateral digital breast tomosynthesis views, to be presented at IEEE ICIP, 2015 [2] G. Van Schie, C. Tanner, P. Snoeren, M. Samulski, K. Leifland, M. G. Wallis, et al., "Correlating locations in ipsilateral breast tomosynthesis views using an analytical hemispherical compression model," Physics in Medicine and Biology, vol. 56, p. 4715, 2011.
23 Multiview analysis: New bilateral mass features in DBT RSs Bilateral features from asymmetric density of masses between the left and right breasts True mass shows large asymmetry Area under the ROC curve (AUC) 23/31 LBP [1] RLS SGLD Intensity LBP+RLS+ SGLD+Intensity Single view feature only Single view feature + proposed bilateral features (feature-level fusion) Left CC view RSs with detected VOIs Right CC view RSs with corresponding VOIs (VOIs in left breast are transformed into right breast) * Single view features* denotes an augmented feature vector that concatenates LBP, RLS, SGLD, intensity features by feature-level fusion Proposed bilateral features improve overall AUCs compared to the AUCs with single-view feature only D. H. Kim, S. T. Kim, Wissam J. Baddar, Y. M. Ro, Feature extraction from bilateral dissimilarity in DBT reconstructed volume, to be presented at IEEE ICIP, 2015 [1] J. Y. Choi and Y. M. Ro, "Multiresolution local binary pattern texture analysis combined with variable selection for application to false positive reduction in computer-aided detection of breast masses on mammograms," Physics in Medicine and Biology, vol 57, no. 2, pp , October 2012
24 Synthetic mammogram: Solution for dose rate 24/31 Currently, as approved by the U. S. Food and Drug Administrator (FDA), DBT should be used in combination with DM [3]. Drawback of combination with DM DBT with DM accompanies doubled dose rate and shooting time in screening. Solution: Synthetic mammogram (Proposed method: Conspicuity-based projection) Proposed method Maximum intensity projection[4] Proposed method Maximum intensity projection[4] S. T. Kim, D. H. Kim, and Y. M. Ro, Generation of Conspicuity-improved Synthetic Image from Digital Breast Tomosynthesis Intenrational Conference on Digital Signal Processing, 2014 [3] M. L. Zuley, et al., Radiology, pp , [4] F. Diekmann et al., Thick slices from tomosynthesis data sets: phantom study for the evaluation of different algoruthms, Journal of Digital Imaging, 2009.
25 Sensitivity (volume-based) Combination CAD using DBT and synthetic mammogram Complementary information between synthetic mammogram and DBT RSs 25/ DBT RSs Synthetic mammogram 0.2 Combined approach DBT volume Synthetic mammogram FPs per DBT volume DBT and synthetic mammogram have complementary information S. T. Kim, D. H. Kim, and Y. M. Ro, Combination of conspicuity improved synthetic mammograms and digital breast tomosynthesis: a promising approach for mass detection SPIE Medical Imaging, 2015
26 26/31 KAIST DBT CAD System Video ivylab.kaist.ac.kr
27 Publications (CAD) 27/31 1. Dae Hoe Kim, Seong Tae Kim, Wissam J. Baddarm, and Yong Man Ro, Feature extraction from bilateral dissimilarity in DBT reconstructed volume, IEEE International Conference on Image Processing (accepted), Seong Tae Kim, Dae Hoe Kim, Dong Jin Ji, and Yong Man Ro, Region matching based on local structure information in ipsilateral digital breast tomosynthesis views, IEEE International Conference on Image Processing (accepted), Seong Tae Kim, Dae Hoe Kim, and Yong Man Ro, Combination of conspicuity improved synthetic mammograms and digital breast tomosynthesis: A promising approach for mass detection, SPIE Medical Imaging, Dae Hoe Kim, Seong Tae Kim, and Yong Man Ro, Feature extraction from inter-view similarity of DBT projection views, SPIE Medical Imaging, Wissam J. Baddar, Eun Joon Kim, Dae Hoe Kim and Yong Man Ro, Utilizing digital breast tomosynthesis projection views correlation for microcalcification enhancement for detection purposes, SPIE Medical Imaging, Seong Tae Kim, Dae Hoe Kim, and Yong Man Ro, Breast mass detection using slice conspicuity in 3D reconstructed digital breast volumes, Physics in Medicine and Biology, vol. 59, pp , Dae Hoe Kim, Jae Young Choi, Yong Man Ro, Region based stellate features combined with variable selection using AdaBoost learning in mammographic computer-aided detection, Computers in Biology and Medicine (in press), Available online 27 September Jae Young Choi, Dae Hoe Kim, Konstantinos N. Plataniotis, and Young Man Ro, Computer-aided detection (CAD) of breast masses in mammography: Combined detection and ensemble classification, Physics in Medicine and Biology, vol. 59, pp , Jun 2014.
28 28/ Seong Tae Kim, Dae Hoe Kim, and Yong Man Ro, Generation of conspicuity-improved synthetic image from digital breast tomosynthesis, International Conference on Digital Signal Processing, Seong Tae Kim, Dae Hoe Kim, Eun Suk Cha, and Yong Man Ro, Mass detection based on pooled mass probability map of 3D reconstructed slices in digital breast tomosynthesis, IEEE-EMBS BHI, Eun Joon Kim, Dae Hoe Kim, Eun Suk Cha, and Yong Man Ro, Improvement of subtle microcalcifications detection in DBT slices, IEEE-EMBS BHI, Wissam J. Baddar, Dae Hoe Kim, and Yong Man Ro, Breast tissue removal for enhancing microcalcification cluster detection in mammograms, IEEE-EMBS BHI, Dae Hoe Kim, Seung Hyun Lee, and Yong Man Ro, Mass type-specific sparse representation for mass classification in computer-aided detection on mammography, Biomedical Engineering Online, 12(Suppl 1):S3, Seung Hyun Lee, Dae Hoe Kim, and Yong Man Ro, Mass type-specific sparse representation for mass classification in computer-aided detection on mammograms, IEEE EMBC Workshop, Seung Hyun Lee, Dae Hoe Kim, Jae Young Choi, and Yong Man Ro, Improving positive predictive value in Computer-aided Diagnosis using mammographic mass and microcalcification confidence score fusion based on co-location information, SPIE Medical Imaging, Dae Hoe Kim, Jae Young Choi, and Yong Man Ro, Boosting framework for mammographic mass classification with combination of CC and MLO view information, SPIE Medical Imaging, Jae Young Choi, and Yong Man Ro, Multiresolution local binary pattern texture analysis combined with variable selection for application to false positive reduction in computer-aided detection of breast masses on mammograms, Physics in Medicine and Biology, vol 57, no. 2, pp , Oct
29 29/ Seung Hyun Lee, Dae Hoe Kim, Won Yong Eom, and Yong Man Ro, Investigating the sparse representation of breast mass features in digital mammography, IFMIA, Wonyong Eom, Wesley De Neve, and Yong Man Ro, Sparse feature analysis for detection of clustered microcalcifications in mammogram images, IFMIA, Dae Hoe Kim, Jae Young Choi, and Yong Man Ro, Region Based Stellate Features for Classification of Mammographic Spiculated Lesions in Computer-Aided Detection, IEEE ICIP, Dae Hoe Kim, Jae Young Choi, and Yong Man Ro, A Novel Mammographic Mass Detection Approach to Combining Supervised and Unsupervised Detection Algorithms, IEEE ICIP, Jae Young Choi, Dae Hoe Kim, Konstantinos N. Plataniotis, and Yong Man Ro, Combining Multiple Feature Representations and AdaBo.ost Ensemble Learning for Reducing False-positive Detections in Computer-Aided Detection of Masses on Mammograms, IEEE EMBC, Jae Young Choi, Dae Hoe Kim, Seon Hyeong Choi, and Yong Man Ro, Multiresolution Local Binary Pattern Texture Analysis for False Positive Reduction in Computerized Detection of Breast Masses on Mammograms, SPIE Medical Imaging, Dae Hoe Kim, Jae Young Choi, Seon Hyeong Choi, Yong Man Ro, Mammographic Enhancement with Combining Local Statistical Measures and Sliding Band Filter for Improved Mass Segmentation in Mammograms, SPIE Medical Imaging, Jae Young Choi, Dae Hoe Kim, and Yong Man Ro, Combining Multiresolution Local Binary Pattern Texture Analysis and Variable Selection Strategy Applied to Computer-Aided Detection of Breast Masses on Mammograms, IEEE-EMBS BHI, Jae Young Choi, Dae Hoe Kim, Yong Man Ro, Computer-Aided Detection of Breast Masses on Mammograms Using Region-Based Feature Analysis, MITA, Sunil Cho, Sung Ho Jin, Yong Man Ro, Sung Min Kim, Microcalcification Detection System in Digital Mammogram using Two-Layer SVM, SPIE Medical Imaging, 2008
30 30/ Ju Won Kwon, Yong Man Ro, Sung Min Kin, Improvement of SVM based Microcalcification Detection, Asian Forum on Medical Imaging, Hokyung Kang, Yong Man Ro, Sung Min Kim, A microcalcification detection using adaptive contrast enhancement on wavelet transform and neural network, IEICE Trans. on Information & Systems,Vol.E89-D, pp March, Ju Won Kwon, Hokyoung Kang, Yong Man Ro, Sung Min Kim, A Microcalcification Detection Using Multi-Layer Support Vector Machine in Korean Digital Mammogram World Congress on Medical Physics and Biomedical Engineering (WC 2006) 33. Ho-Kyung Kang, Nguyen N. Thanh, Sung-Min Kim, and Yong Man Ro, Robust contrast enhancement for microcalcification in mammography, LNCS 3045, pp , July Ho-Kyung Kang, Sung-Min Kim, Nguyen N. Thanh,Yong Man Ro, and Won-Ha Kim, Adaptive microcalcification detection in computer aided diagnosis, LNCS 3039, pp , June Jeong Hyun Yoon, Yong Man Ro, Enhancement of the contrast in mammographic imges using the homomorphic filter method, IEICE Trans. on Information & Systems,Vol.E85-D, pp , January Jeong Hyun Yoon, Yong Man Ro, Contrast Enhancement of Mammography Image using Homomorphic Filter in Wavelet Domain, International Workshop on Digital Mammography (IWDM), 2000
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