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A 4-afc study comparing ultrasound machines using a greyscale phantom

Conference paper
Authors Robert Lorentsson
N. Hosseini
J.O. Johansson
W. Rosenberg
B. Stenborg
Lars Gunnar Månsson
Magnus Båth
Published in IFMBE Proceedings. 16th Nordic-Baltic Conference on Biomedical Engineering. October 14-16, 2014, Gothenburg, Sweden
Volume 48
Pages 82-85
ISSN 1680-0737
Publication year 2015
Published at Institute of Clinical Sciences, Department of Radiation Physics
Pages 82-85
Language en
Links dx.doi.org/10.1007/978-3-319-12967-...
Keywords 4-AFC , Detection , Phantom observation , Ultrasound
Subject categories Radiology, Radiological physics, Medical technology

Abstract

© Springer International Publishing Switzerland 2015. Two ultrasound machines, one high-end and one ordinary, were compared in terms of their ability to reproduce low-contrast objects using the same probe. Images containing 4 mm objects of four different contrasts were collected from a greyscale phantom at 35-42 mm depth. Six observers participated in a 4-alternative forced choice study based on 120 images. At this certain depth and object size the proportion of correct responses was higher (statistically significant) for the high-end machine at three of four contrast levels, indicating the possibility to discriminate between ultrasound machines using a limited number of images of a greyscale phantom. However, the number of images and number of observers needed are larger than usually used for constancy control.

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