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P2.6 Artery Distension Measured With Standard B-Mode Image Echo-Tracking Has Similar Absolute Values And Precision As Measured with Radio-Frequency Phase-Tracking

Abstract

Objectives

Artery distension, the difference between diastolic and systolic diameter, is an important measure in stiffness evaluation. Distension can be extracted with high precision and accuracy from radio-frequency ultrasound (US) measurements at a high frame-rate using phase-tracking. However, in daily practice processed B-mode images are collected with a lower framerate, but higher line density, and distension may only be assessed using echo-tracking. Therefore, the aim of this study is to evaluate the accuracy and precision of echo-tracking distension as compared to that of phase-tracking distension.

Methods

Longitudinal B-mode (40mm, 37fps) US-measurements (video clips 3–6 heartbeats) of the left common carotid artery were performed with a Philips IU22 scanner on 21 patients (age 45–88y) with a recent cerebrovascular accident. In addition, unprocessed radio-frequency US-measurements were performed with a Mylab70 scanner operating in Fast B-mode (31 lines covering 29mm, 300fps, 3–6 heartbeats). To extract the diameter waveform, semi-automatic wall echo-tracking and phase-tracking methods were applied to B-mode and Fast B-mode measurements respectively.

Results

One patient was excluded due to large out of plane motion. Although phase-tracking diameter waveforms showed more detail, both methods exhibit similar intra-subject precision (SD = 34μm and SD = 33μm, F-test: p-value = 0.4). Echo-tracking and phase-tracking systolic-diastolic distension were similar (bias is 25±90μm, paired t-test: p-value = 0.18).

Conclusion

Clinical scanners operating in B-mode can be used to measure distension with reasonable precision and accuracy in a relevant stroke population, although waveform details may be masked at lower frame-rates. This research was supported by the Center for Translational Molecular Medicine and the Dutch Heart Foundation.

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This is an open access article distributed under the CC BY-NC license http://creativecommons.org/licenses/by/4.0/.

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Steinbuch, J., Hermeling, E., Schreuder, F. et al. P2.6 Artery Distension Measured With Standard B-Mode Image Echo-Tracking Has Similar Absolute Values And Precision As Measured with Radio-Frequency Phase-Tracking. Artery Res 8, 134 (2014). https://doi.org/10.1016/j.artres.2014.09.102

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  • DOI: https://doi.org/10.1016/j.artres.2014.09.102