Test-retest reliability of real-time elastography using an external reference material: preliminary results

Schneebeli, Alessandro and Cescon, Corrado and Del Grande, Filippo and Vincenzo, Gabriele and Biordi, Fulvio and Barbero, Marco (2014) Test-retest reliability of real-time elastography using an external reference material: preliminary results. In: Proceedings of the XX Congress of the International Society of Electrophysiology and Kinesiology, 14-18 July 2014, Rome, Italy.

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Abstract

AIM: The aim of this study was to examine test-retest reliability of real-time elastography (RTE) using an external reference material. METHODS: Six healthy subjects were recruited. Longitudinal RTE ultrasound (MyLab™ ClassC) images of the left and right Achilles tendon area were acquired in a test-retest session. An external reference material (Zerdine®, CIRS, Inc., Norfolk), with known elastic properties (first layer 93 kPa, second layer 10.5 kPa), was placed on the subject’s Achilles tendon and included in the b-mode scans. The reference material was used to normalize color scale among subjects. Different region of interest (ROI), including different human tissue (skin, Achilles tendon, Kager fat pad), were drawn in the images. The range between soft and hard (from red to blue) was divided in 256 steps (0-255), according to the ultrasound image color depth. The median and interquartile range of colors was computed. Test-retest reliability were calculated for the different tissues using Bland Altman plots mean difference and 95% Confidence Intervals (CI). RESULTS: Bland Altman plots show a mean difference of 4.58(95%CI: -12.3 to 21.5) for the reference 93kPa, 9.17(95%CI: -12.8 to 31.1) for the skin, -3.75(95%CI: -24.5 to 17) for the tendon and -5.42(95%CI: -42 to 31.1) for the Kager fat pad. CONCLUSION: Preliminary results shows good reliability of RTE using an external reference material especially on Achilles tendon

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