Publication: Research - peer-review › Article in proceedings – Annual report year: 2012
The echo from planar surfaces with rms roughness, Rq, in the range from 0-155 μm was measured with a clinical linear array transducer at different angles of incidence at 6 MHz and 12 MHz. The echo-pulse from the surfaces was isolated with an equal sized window and the power of the echo-pulse was calculated. The power of the echo from the smooth surface (Rq = 0) is highly angle-dependent due to a high degree of specular reflection. Within the angular range considered here, -10° to 10°, the variation spans a range of 18 dB at both 6 MHz and 12 MHz. When roughness increases, the angle-dependence decreases, as the echo process gradually changes from pure reflection to being predominantly governed by backscattering. The power of the echoes from the two roughest surfaces (Rq = 115 μm and 155 μm) are largely independent of angle at both 6 MHz and 12 MHz with a variation of 2 dB in the angular range from -10° to 10°. The least rough surfaces (Rq = 32 μm and 89 μm) have responses in between with a higher degree of angle-dependence at 6 MHz than at 12 MHz.
|Title of host publication||Proceedings of the International Congress on Ultrasonics|
|Publisher||American Institute of Physics|
|Conference||International Congress on Ultrasonics|
|Period||05/09/11 → 08/09/11|
|Name||AIP Conference Proceedings|
|Citations||Web of Science® Times Cited: 0|
- Ultrasound, Linear array transducer, Surface roughness, Obligue interface
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