Conference proceeding
Predicting radiologists' true and false positive decisions in reading mammograms by using gaze parameters and image-based features
Progress in Biomedical Optics and Imaging - Proceedings of SPIE, Vol.9787, pp.978715-978715-10
03/24/2016
DOI: 10.1117/12.2217704
Abstract
Radiologists’ gaze-related parameters combined with image-based features were utilized to classify suspicious mammographic areas ultimately scored as True Positives (TP) and False Positives (FP). Eight breast radiologists read 120 two-view digital mammograms of which 59 had biopsy proven cancer. Eye tracking data was collected and nearby fixations were clustered together. Suspicious areas on mammograms were independently identified based on thresholding an intensity saliency map followed by automatic segmentation and pruning steps. For each radiologist reported area, radiologist’s fixation clusters in the area, as well as neighboring suspicious areas within 2.5° of the center of fixation, were found. A 45-dimensional feature vector containing gaze parameters of the corresponding cluster along with image-based characteristics was constructed. Gaze parameters included total number of fixations in the cluster, dwell time, time to hit the cluster for the first time, maximum number of consecutive fixations, and saccade magnitude of the first fixation in the cluster. Image-based features consisted of intensity, shape, and texture descriptors extracted from the region around the suspicious area, its surrounding tissue, and the entire breast. For each radiologist, a userspecific Support Vector Machine (SVM) model was built to classify the reported areas as TPs or FPs. Leave-one-out cross validation was utilized to avoid over-fitting. A feature selection step was embedded in the SVM training procedure by allowing radial basis function kernels to have 45 scaling factors. The proposed method was compared with the radiologists’ performance using the jackknife alternative free-response receiver operating characteristic (JAFROC). The JAFROC figure of merit increased significantly for six radiologists.
Details
- Title: Subtitle
- Predicting radiologists' true and false positive decisions in reading mammograms by using gaze parameters and image-based features
- Creators
- Ziba Gandomkar - The Univ. of Sydney (Australia)Kevin Tay - The Univ. of Sydney (Australia)Will Ryder - The Univ. of Sydney (Australia)Patrick C Brennan - The Univ. of Sydney (Australia)Claudia Mello-Thoms - The Univ. of Sydney (Australia)
- Contributors
- Craig K Abbey (Editor) - Univ. of California, Santa Barbara (United States)Matthew A Kupinski (Editor) - College of Optical Sciences, The Univ. of Arizona (United States)
- Resource Type
- Conference proceeding
- Publication Details
- Progress in Biomedical Optics and Imaging - Proceedings of SPIE, Vol.9787, pp.978715-978715-10
- Publisher
- SPIE
- DOI
- 10.1117/12.2217704
- ISSN
- 1605-7422
- Language
- English
- Date published
- 03/24/2016
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Radiology
- Record Identifier
- 9984051899902771
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