Elaine Y. L. Lui, MSc, Aaron H. Steinman, PhD, Richard S. C

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Presentation transcript:

Human factors as a source of error in peak Doppler velocity measurement Elaine Y.L. Lui, MSc, Aaron H. Steinman, PhD, Richard S.C. Cobbold, PhD, K. Wayne Johnston, MD Journal of Vascular Surgery Volume 42, Issue 5, Pages 972.e1-972.e10 (November 2005) DOI: 10.1016/j.jvs.2005.07.014 Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 1 Example of a control experiment display (fixed probe, ideal gain, expanded waveform size) as presented to the technologists for measurements from the unstenosed tube. Journal of Vascular Surgery 2005 42, 972.e1-972.e10DOI: (10.1016/j.jvs.2005.07.014) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 2 Sample experimental average flow waveform as measured by a transit-time flowmeter (Model T108 and 10C302, Transonics System Inc, Ithica, NY) for the unstenosed tube. A similar waveform was obtained for the stenosed tube. Journal of Vascular Surgery 2005 42, 972.e1-972.e10DOI: (10.1016/j.jvs.2005.07.014) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 3 Control measurements made by the technologists (A, B, C, D) using the probe holder with a fixed ideal Doppler gain and an expanded waveform display (N = 10). a, Average (■) and range (×) in percent error from the true peak velocity. The error bars represent one standard deviation of the average percent error. b, Coefficient of variation. Journal of Vascular Surgery 2005 42, 972.e1-972.e10DOI: (10.1016/j.jvs.2005.07.014) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 4 Averaged peak velocity results when the probe was adjusted by hand (N = 10). a, Average (■) and range (×) in percent error from the true peak velocity. The error bars represent one standard deviation of the average percent error. b, Coefficient of variation. For comparison, the average error was between 9% and 14% and the coefficients of variation were between 1% and 2% for the control measurements. A, B, C, and D designate the technologists. Journal of Vascular Surgery 2005 42, 972.e1-972.e10DOI: (10.1016/j.jvs.2005.07.014) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 5 Doppler recording made while adjusting the continuous Doppler gain control from minimum to maximum. The velocity is given on the y-axis and time along the x-axis. Journal of Vascular Surgery 2005 42, 972.e1-972.e10DOI: (10.1016/j.jvs.2005.07.014) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 6 Average percent error of measurements (N = 10) made from the unstenosed vessel at three different Doppler gain settings: low (♦), ideal (■), and saturation onset (▴). a, Shows the dependence of the measurement error on the gain. b, Shows the coefficient of variation. Shown in (a) is the range in percent error (×) for each measurement, and the error bars represent one standard deviation of the average percent error. Journal of Vascular Surgery 2005 42, 972.e1-972.e10DOI: (10.1016/j.jvs.2005.07.014) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig 7 Measurements (N = 10) made using the compressed waveform display. a, Average (■) and range (×) in percent error from the true peak velocity. The error bars represent one standard deviation of the average percent error. b, Coefficient of variation. For comparison, the average error was between 9% and 14%, and the coefficients of variation were between 1% and 2% for the control measurements. Journal of Vascular Surgery 2005 42, 972.e1-972.e10DOI: (10.1016/j.jvs.2005.07.014) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig A (online only) Comparison of peak velocity measured by technologists vs the built-in automatic velocity-tracking algorithm (Auto Doppler function on the Acuson Aspen). Data were collected from full carotid studies on 19 patients giving a total of 219 measurements from different sites in the left and right internal carotid artery, common carotid artery, and external carotid artery. Journal of Vascular Surgery 2005 42, 972.e1-972.e10DOI: (10.1016/j.jvs.2005.07.014) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig B1 (online only) Measured peak velocity values for the unstenosed vessel (N=10). The dashed line is the true value calculated using computational fluid dynamics, the solid line is the mean measured value, and the dotted lines show one standard deviation from the mean. Journal of Vascular Surgery 2005 42, 972.e1-972.e10DOI: (10.1016/j.jvs.2005.07.014) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions

Fig B2 (online only) Measured peak velocity values for the 61% stenosed vessel (N=10). The dashed line is the true value, the solid line is the mean measured value, and the dotted lines show one standard deviation from the mean. Journal of Vascular Surgery 2005 42, 972.e1-972.e10DOI: (10.1016/j.jvs.2005.07.014) Copyright © 2005 The Society for Vascular Surgery Terms and Conditions