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Comparison of the low-contrast detectability of two ultrasound systems using a grayscale phantom

Journal article
Authors Robert Lorentsson
N. Hosseini
J. O. Johansson
W. Rosenberg
B. Stenborg
Lars Gunnar Månsson
Magnus Båth
Published in Journal of Applied Clinical Medical Physics
Volume 17
Issue 6
Pages 366-378
ISSN 1526-9914
Publication year 2016
Published at Institute of Clinical Sciences, Department of Radiation Physics
Pages 366-378
Language en
Links dx.doi.org/10.1120/jacmp.v17i6.6246
Keywords ultrasound, gray scale, phantom, observation, observer performance, breast tomosynthesis, digital mammography, detail, analysis, visibility, software, scanners, viewdex, masses, Radiology, Nuclear Medicine & Medical Imaging
Subject categories Clinical Medicine

Abstract

The purpose of the present study was to use a commercially available grayscale phantom to compare two ultrasound systems regarding their ability to reproduce clinically relevant low-contrast objects at different sizes and depths, taking into account human observer variability and other methodological issues related to observer performance studies. One high-end and one general ultrasound scanner from the same manufacturer using the same probe were included. The study was intended to simulate the clinical situation where small low-contrast objects are embedded in relatively homogeneous organs. Images containing 4 and 6.4 mm objects of four different contrasts were acquired from the grayscale phantom at different depths. Six observers participated in a 4-alternative forced-choice study based on 960 images. Case sample and human observer variabilities were taken into account using bootstrapping. At four of sixteen depth/size/contrast combinations, the visual performance of the high-end scanner was significantly higher. Thus, it was possible to use a grayscale phantom to discriminate between the two evaluated ultrasound systems in terms of their ability to reproduce clinically relevant low-contrast objects. However, the number of images and number of observers were larger than those usually used for constancy control.

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