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Comparison of the low-contrast detectability of two ultrasound systems using a grayscale phantom
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- Lorentsson, Robert, 1969 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för kliniska vetenskaper, Avdelningen för radiofysik,Institute of Clinical Sciences, Department of Radiation Physics
- Hosseini, N. (author)
- Johansson, J. O. (author)
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- Rosenberg, W. (author)
- Stenborg, B. (author)
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- (creator_code:org_t)
- 2016-11-08
- 2016
- English.
- In: Journal of Applied Clinical Medical Physics. - : Wiley. - 1526-9914. ; 17:6, s. 366-378
- Journal article (peer-reviewed)
Abstract
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- 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.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine (hsv//eng)
Keyword
- ultrasound
- gray scale
- phantom
- observation
- observer performance
- breast tomosynthesis
- digital mammography
- detail
- analysis
- visibility
- software
- scanners
- viewdex
- masses
- Radiology
- Nuclear Medicine & Medical Imaging
Publication and Content Type
- ref (subject category)
- art (subject category)
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