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Ideal and visual-search observers: accounting for anatomical noise in search tasks with planar nuclear imaging

Lookup NU author(s): Dr Anando SenORCiD


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Model observers have frequently been used for hardware optimization of imaging systems. For model observers to reliably mimic human performance it is important to account for the sources of variations in the images. Detection-localization tasks are complicated by anatomical noise present in the images. Several scanning observers have been proposed for such tasks. The most popular of these, the channelized Hotelling observer (CHO) incorporates anatomical variations through covariance matrices. We propose the visual-search (VS) observer as an alternative to the CHO to account for anatomical noise. The VS observer is a two-step process which first identifies suspicious tumor candidates and then performs a detailed analysis on them. The identification of suspicious candidates (search) implicitly accounts for anatomical noise. In this study we present a comparison of these two observers with human observers. The application considered is collimator optimization for planar nuclear imaging. Both observers show similar trends in performance with the VS observer slightly closer to human performance.

Publication metadata

Author(s): Sen A, Gifford HC

Editor(s): Mello-Thoms CR; Kupinski MA

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: SPIE Medical Imaging 2015: Image Perception, Observer Performance, and Technology Assessment

Year of Conference: 2015

Pages: 94160R

Online publication date: 17/03/2015

Acceptance date: 15/10/2014

ISSN: 0277-786X

Publisher: SPIE


DOI: 10.1117/12.2081763