Is grey level a suitable alternative to low-contrast penetration as a serial measure of sensitivity in computerised ultrasound quality assurance?
Gibson, Nicholas M
Gibson, Nicholas M
Abstract
The aim of this study was to test the hypothesis that grey levels are a suitable alternative measure of sensitivity in ultrasound imaging quality assurance, as there are several caveats in the use of penetration depth. In a primary cohort of nine probes, where measurements had been made for 6 to 34 mo, both penetration depth and mean grey level fell below tolerance for six probes; both penetration depth and mean grey level remained within tolerance for three probes. In a secondary cohort where a measurement programme had been in place for a shorter period, grey level and/or penetration depth fell below tolerance in 15 of 66 probes; the sensitivity and specificity of at least 10% loss of grey level in predicting >5% loss in penetration depth were 91% and 93%, respectively. A loss of grey level accompanies a loss of penetration and provides a suitable alternative measure of sensitivity. Crown Copyright © 2016. Published by Elsevier Inc. All rights reserved.
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Date
2017
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Dudley, N.J. and Gibson, N.M. (2017) 'Is Grey Level a Suitable Alternative to Low-Contrast Penetration as a Serial Measure of Sensitivity in Computerised Ultrasound Quality Assurance?', Ultrasound in medicine & biology, 43(2), pp. 541-545. doi: https://dx.doi.org/10.1016/j.ultrasmedbio.2016.09.023