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KMID : 0372919980190040379
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Journal of Biomedical Engineering Research
1998 Volume.19 No. 4 p.379 ~ p.384
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Measurement of the Skin Blood Flow using Cross-Correlation
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Lee Jeong-Taek
Kim Yeong-Gil
Im Chun-Seong
Ryu Jeom-Su
Lee Jong-Su
Gong Seong-Bae
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Abstract
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To measure precisely the blood velocity in the skin microcirculation, we have used time domain correlation (called Cross-Correlation) based on the processing of the backscattered RF signal obtained with a wideband echographic imaging transducer, although it is difficulties of adaptation of the pulsed wave system, because of the data processing in real time and the hardware problem. This dedicated technology based on a 20MHz echographic imaging system has been developed. We present how the experimental data, i.e. the backscattered RF signal, have to be analyzed. After RF lines realignment, stationary echo canceling procedure and correlation level control, a velocity profile has been obtained. In-vitro result show that velocity measurements as low as 0.1mm/sec attainable with a 80${\mu}m$ in axial resolution. We have also validated with in-vivo experimentation on the external ear of a rabbit using B-mode sector scanning image and M-mode image of a custom made 20MHz skin image system. The flow of the "auriculares caudales" vein, a microvessel of 600 m diameter, has been detected and studied. This technique will allow a more precise exploration of circulatory troubles in cutaneous pathologies.
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KEYWORD
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time domain cross-correlation, skin blood flow estimation, pulsed wave system, 20MHz skin image system
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