Effects of Tissue Anisotropy on the Spectral Characteristics of Ultrasonic Backscatter Measured with a Clinical Imaging System
| Autor: | Scott M. Handley, Mark R. Holland, K.D. Wallace, Ann E. Finch-Johnston, David M Prater, James G. Miller, Stephen H. Lewis, Alwyn D'Sa, Julio E. Pérez, Christopher S. Hall |
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| Rok vydání: | 1998 |
| Předmět: |
Materials science
Rotation Backscatter 01 natural sciences Ultrasonic backscatter 030218 nuclear medicine & medical imaging Tendons 03 medical and health sciences 0302 clinical medicine Optics 0103 physical sciences Perpendicular Animals Ultrasonics Radiology Nuclear Medicine and imaging Anisotropy 010301 acoustics Ultrasonography Radiological and Ultrasound Technology business.industry Ultrasound Spectral properties Centroid Signal Processing Computer-Assisted Cattle Collagen Radio frequency business |
| Zdroj: | Ultrasonic Imaging. 20:178-190 |
| ISSN: | 1096-0910 0161-7346 |
| DOI: | 10.1177/016173469802000303 |
| Popis: | 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° 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. |
| Databáze: | OpenAIRE |
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