Quality improvement of acoustic-resolution photoacoustic imaging of skin vasculature based on practical synthetic-aperture focusing and bandpass filtering

Yasuyuki Tsunoi, Kenichiro Yoshimi, Ryota Watanabe, Nori Kumai, Mitsuhiro Terakawa, Shunichi Sato

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We previously developed a compact acoustic-resolution photoacoustic (PA) imaging system with optical fiber-based illumination, by which blood vessels in the rat skin were visualized in vivo. However, there were issues to be improved in the imaging characteristics: blurring in the out-of-focus region of the ultrasound sensor and degraded resolution due to low-frequency components in the PA signals. These are common limitations in acoustic-resolution PA imaging methods. In this study, we attempted to solve these problems by introducing signal processing methods based both on the synthetic-aperture focusing technique, which was applied only to signals in the detection zone of the sensor in the horizontal direction that was determined in advance in a phantom study, and on digital acoustic signal filtering with three specific frequency bands. Ex vivo and in vivo PA imaging of blood vessels in the rat skin and subcutaneous tissue showed the validity of the present signal processing methods.

Original languageEnglish
Article number127001
JournalJapanese Journal of Applied Physics
Volume57
Issue number12
DOIs
Publication statusPublished - 2018 Dec 1

Fingerprint

Synthetic apertures
synthetic apertures
Photoacoustic effect
Skin
Acoustics
blood vessels
Imaging techniques
rats
acoustics
signal processing
Blood vessels
Rats
Signal processing
blurring
sensors
Sensors
Optical resolving power
optical fibers
illumination
Imaging systems

ASJC Scopus subject areas

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

Cite this

Quality improvement of acoustic-resolution photoacoustic imaging of skin vasculature based on practical synthetic-aperture focusing and bandpass filtering. / Tsunoi, Yasuyuki; Yoshimi, Kenichiro; Watanabe, Ryota; Kumai, Nori; Terakawa, Mitsuhiro; Sato, Shunichi.

In: Japanese Journal of Applied Physics, Vol. 57, No. 12, 127001, 01.12.2018.

Research output: Contribution to journalArticle

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