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

Chihiro Arihara, Hideyuki Hasegawa, Hiroshi Kanai

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)4727-4731
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume45
Issue number5 B
DOIs
Publication statusPublished - 2006 May 25

Keywords

  • Atherosclerosis
  • Inverse filter
  • Phase shift
  • Point spread function
  • Roughness
  • Surface profile

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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