Effects of Inherent Tissue Anisotropy on Measurements Obtained with a Clinical Ultrasonic Imaging System

Holland, Mark; Hall, Christopher S.; Lewis, S.H.; Handley, Scott M.; Finch-Johnston, Ann E.; D'Sa, Alwyn; Pérez, Julio E.; Miller, James G.

doi:10.1007/978-1-4615-5947-4_174

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“…18,20.28,30,43 These previous studies have measured both the absolute integrated backscatter in the frequency domain over a useful bandwidth' 8, 20, 28,30 and the relative measures of real-time, time-domain integrated backscatter. 16,43 Both in this study as well as in the previous studies, the backscattered power is much greater for perpendicular angles of incidence with respect to fiber orientation compared to the values for parallel incidence as confirmed with the position of the fiducial mark indicating fiber orientation on the tendon specimens.…”

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confidence: 88%

Effects of Tissue Anisotropy on the Spectral Characteristics of Ultrasonic Backscatter Measured with a Clinical Imaging System

Holland¹,

Lewis²,

Hall³

et al. 1998

Ultrason Imaging

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In this paper, we report the effects of inherent tissue anisotropy on the spectral properties of backscattered ultrasound when measured with a commercially-available imaging system. We insonified five specimens of bovine tendon immersed in a water tank and rotated in 10 degrees increments while being imaged with a Hewlett-Packard Sonos 1500 system. The backscattered RF signals corresponding to each angle of insonification were digitized and the spectral characteristics of the backscattered ultrasound were determined. The mean anisotropy, defined as the average difference between values at perpendicular and parallel insonification, for band-limited estimates of backscattered power, centroid frequency, upper-band to lower-band power ratio, and upper-band to total-band power ratio were found to be 24.6 +/- 1.1 dB, 142 +/- 27 kHz, 32 +/- 13%, and 22 +/- 5%, respectively (mean +/- SE). The magnitude of each of these backscatter spectral parameters was larger at perpendicular insonification compared with the corresponding values at parallel insonification, consistent with previous measurements of the inherent anisotropy of ultrasonic attenuation and backscatter in tissue.

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Section: Discussionsupporting

confidence: 88%