Paper Info
Title
Predicting radiologists' true and false positive decisions in reading mammograms by using gaze parameters and image-based features.
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 degrees 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 user-specific 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.
Year
DOI
Venue
2016
10.1117/12.2217704
Proceedings of SPIE
Keywords
Field
DocType
Radiologists' error prediction,mammography,gaze pattern,JAFROC analysis
Digital mammography,Computer vision,Mammography,Feature vector,Receiver operating characteristic,Image segmentation,Eye tracking,Artificial intelligence,Thresholding,Physics,False positive paradox
Conference
Volume
ISSN
Citations 
9787
0277-786X
0
PageRank 
References 
Authors
0.34
0
5
Name
Order
Citations
PageRank
Ziba Gandomkar142.13
Kevin Tay210.71
Will Ryder321.75
Patrick C. Brennan4412.71
Claudia Mello-Thoms54014.29