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Proceedings Paper

Implication of the first decision on visual information-sampling in the spatial frequency domain in pulmonary nodule recognition
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Paper Abstract

Aim: To investigate the impact on visual sampling strategy and pulmonary nodule recognition of image-based properties of background locations in dwelled regions where the first overt decision was made. . Background: Recent studies in mammography show that the first overt decision (TP or FP) has an influence on further image reading including the correctness of the following decisions. Furthermore, the correlation between the spatial frequency properties of the local background following decision sites and the first decision correctness has been reported. Methods: Subjects with different radiological experience were eye tracked during detection of pulmonary nodules from PA chest radiographs. Number of outcomes and the overall quality of performance are analysed in terms of the cases where correct or incorrect decisions were made. JAFROC methodology is applied. The spatial frequency properties of selected local backgrounds related to a certain decisions were studied. ANOVA was used to compare the logarithmic values of energy carried by non redundant stationary wavelet packet coefficients. Results: A strong correlation has been found between the number of TP as a first decision and the JAFROC score (r = 0.74). The number of FP as a first decision was found negatively correlated with JAFROC (r = -0.75). Moreover, the differential spatial frequency profiles outcomes depend on the first choice correctness.

Paper Details

Date Published: 27 February 2010
PDF: 11 pages
Proc. SPIE 7627, Medical Imaging 2010: Image Perception, Observer Performance, and Technology Assessment, 762719 (27 February 2010); doi: 10.1117/12.844140
Show Author Affiliations
Mariusz W. Pietrzyk, Univ. of Cumbria (United Kingdom)
Lancaster Univ. (United Kingdom)
David Manning, Univ. of Cumbria (United Kingdom)
Tim Donovan, Univ. of Cumbria (United Kingdom)
Lancaster Univ. (United Kingdom)
Alan Dix, Lancaster Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 7627:
Medical Imaging 2010: Image Perception, Observer Performance, and Technology Assessment
David J. Manning; Craig K. Abbey, Editor(s)

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