Accurate ultrasonic measurement of surface profile using phase shift of echo and inverse filtering

被引：0
|
作者：
Arihara, Chihiro [1 ]
Hasegawa, Hideyuki [1 ]
Kanai, Hiroshi [1 ]
机构：
[1] Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan
来源：
Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers | 2006年 / 45卷 / 5 B期
关键词：
Atherosclerosis is the main cause of circulatory diseases such as myocardial infarction and cerebral infarction; and it is very important to diagnose atherosclerosis in its early stage. In the early stage of atherosclerosis; the luminal surface of an arterial wall becomes rough because of the injury of the endothelium [R. Ross: New Engl. J. Med. 340 (2004) 115]. Conventional ultrasonic diagnostic equipments cannot detect such roughness on the order of micrometer because of their low resolution of approximately 0.1 mm. In this study; for the accurate detection of surface roughness; an ultrasonic beam was scanned in the direction that is parallel to the surface of an object. When there is a gap on the surface; the phase of the echo from the surface changes because the distance between the probe and the surface changes during the scanning. Therefore; surface roughness can be assessed by estimating the phase shift of echoes obtained during the beam scanning. Furthermore; lateral resolution; which is deteriorated by a finite diameter of the ultrasound beam; was improved by an inverse filter. By using the proposed method; the surface profile of a phantom; which had surface roughness on the micrometer order; was detected; and the estimated surface profiles became more precise by applying the inverse filter. © 2006 The Japan Society of Applied Physics;
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Journal article (JA)
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页码：4727 / 4731
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