On the choice of acceptance radius in free-response observer performance studies.

The British Journal of Radiology
T M HaygoodDev P Chakraborty

Abstract

Choosing an acceptance radius or proximity criterion is necessary to analyse free-response receiver operating characteristic (FROC) observer performance data. This is currently subjective, with little guidance in the literature about what is an appropriate acceptance radius. We evaluated varying acceptance radii in a nodule detection task in chest radiography and suggest guidelines for determining an acceptance radius. 80 chest radiographs were chosen, half of which contained nodules. We determined each nodule's centre. 21 radiologists read the images. We created acceptance radii bins of <5 pixels, <10 pixels, <20 pixels and onwards up to <200 and 200+ pixels. We counted lesion localisations in each bin and visually compared marks with the borders of nodules. Most reader marks were tightly clustered around nodule centres, with tighter clustering for smaller than for larger nodules. At least 70% of readers' marks were placed within <10 pixels for small nodules, <20 pixels for medium nodules and <30 pixels for large nodules. Of 72 inspected marks that were less than 50 pixels from the centre of a nodule, only 1 fell outside the border of a nodule. The acceptance radius should be based on the larger nodule sizes. For our data, an ...Continue Reading

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Citations

Nov 26, 2015·Clinical Radiology·W I SuleimanP C Brennan
Nov 10, 2013·Academic Radiology·Tamara Miner HaygoodEdith M Marom
Mar 14, 2018·Medical Physics·Craig K AbbeyKyle Myers
Sep 24, 2016·Journal of Digital Imaging·Stephen LittlefairClaudia Mello-Thoms
Jul 7, 2020·Acta Radiologica·Dana S Al-MousaPatrick C Brennan
Apr 1, 2014·Journal of Medical Imaging·Wasfi I SuleimanMark F McEntee
Dec 15, 2012·The British Journal of Radiology·E A Krupinski
May 1, 2018·Cognitive Research: Principles and Implications·Ann J CarriganAnina N Rich

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