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Proceedings Paper

Perception in screening mammography: Can insertion of obvious cases enhance detection?
Author(s): Sarah J. Lewis; Mariusz W. Pietrzyk; Robert C. K. Nurthen; Mark F. McEntee; Michael Evanoff; Warwick Lee; Patrick C. Brennan; Warren M. Reed
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Paper Abstract

Purpose : To determine whether a strategy of inserting obvious cancers can improve the detection of subsequent abnormal cases in screening mammography sets. Method : Eight experienced breast imaging radiologists (mammographers) were asked to interpret 40 mammography cases in two sittings and localise any malignancies present. Two differing conditions were presented to participants. In Condition 1, there were 36 normal images interspersed with 4 abnormal cases determined to be of medium to high difficulty. Condition 2 differed in that two normal cases were replaced with two obvious malignant cases. These two obvious cases were placed shortly before two subtle malignancies. In both sittings, participants were told they were viewing a screening mammography set. Results: There was no statistical difference in the location sensitivity between the 2 conditions. There was decreased overall specificity in Condition 2 (p = 0.43). Conclusion: Preliminary findings suggest that the insertion of more easily observed abnormal cases into image sets does not improve performance and may in fact result in lower specificity. Further analysis of participants’ eye-positions, and search strategies may offer some explanation of our findings

Paper Details

Date Published: 28 March 2013
PDF: 5 pages
Proc. SPIE 8673, Medical Imaging 2013: Image Perception, Observer Performance, and Technology Assessment, 867308 (28 March 2013); doi: 10.1117/12.2008103
Show Author Affiliations
Sarah J. Lewis, The Univ. of Sydney (Australia)
Mariusz W. Pietrzyk, The Univ. of Sydney (Australia)
Robert C. K. Nurthen, The Univ. of Sydney (Australia)
Mark F. McEntee, The Univ. of Sydney (Australia)
Michael Evanoff, The American Board of Radiology (United States)
Warwick Lee, The Univ. of Sydney (Australia)
Cancer Institute NSW (Australia)
Patrick C. Brennan, The Univ. of Sydney (Australia)
Warren M. Reed, The Univ. of Sydney (Australia)

Published in SPIE Proceedings Vol. 8673:
Medical Imaging 2013: Image Perception, Observer Performance, and Technology Assessment
Craig K. Abbey; Claudia R. Mello-Thoms, Editor(s)

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