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Proceedings Paper

Photoacoustic imaging system for peripheral small-vessel imaging based on clinical ultrasound technology
Author(s): Kaku Irisawa; Kazuhiro Hirota; Atsushi Hashimoto; Dai Murakoshi; Hiroyasu Ishii; Takuji Tada; Takatsugu Wada; Toshiro Hayakawa; Ryuichi Azuma; Naoki Otani; Kenji Itoh; Miya Ishihara
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Paper Abstract

One of the features of photoacoustic (PA) imaging is small-vessel visualization realized without injection of a contrast agent or exposure to X-rays. For carrying out clinical studies in this field, a prototype PA imaging system has been developed. The PA imaging system utilizes a technological platform of FUJIFILM’s clinical ultrasound (US) imaging system mounting many-core MPU for enhancing the image quality of US B-mode and US Doppler mode, which can be superposed onto PA images. By evaluating the PA and US Doppler images of the prototyped system, the applicability of the prototype system to small-vessel visualization has been discussed. The light source for PA imaging was on a compact cart of a US unit and emitted 750 nm wavelength laser pulses. The laser light was transferred to illumination optics in a handheld US transducer, which was connected to the US unit. Obtained PA rf data is reconstructed into PA images in the US unit. 3D images were obtained by scanning a mechanical stage, which the transducer is attached to. Several peripheral parts such as fingers, palms and wrists were observed by PA and US Doppler imaging. As for small arteries, US Doppler images were able to visualize the bow-shaped artery in the tip of the finger. Though PA images cannot distinguish arteries and veins, it could visualize smaller vessels and showed good resolution and vascular connectivity, resulting in a complementary image for the US Doppler images. Therefore, superposed images of the PA, US B-mode and US Doppler can visualize from large to small vessels without a contrast agent, which should be a differentiating feature of US/PA combined technology from other clinical vascular imaging modalities.

Paper Details

Date Published: 15 March 2016
PDF: 10 pages
Proc. SPIE 9708, Photons Plus Ultrasound: Imaging and Sensing 2016, 970807 (15 March 2016); doi: 10.1117/12.2211352
Show Author Affiliations
Kaku Irisawa, FUJIFILM Corp. (Japan)
Kazuhiro Hirota, FUJIFILM Corp. (Japan)
Atsushi Hashimoto, FUJIFILM Corp. (Japan)
Dai Murakoshi, FUJIFILM Corp. (Japan)
Hiroyasu Ishii, FUJIFILM Corp. (Japan)
Takuji Tada, FUJIFILM Corp. (Japan)
Takatsugu Wada, FUJIFILM Corp. (Japan)
Toshiro Hayakawa, FUJIFILM Corp. (Japan)
Ryuichi Azuma, National Defense Medical College (Japan)
Naoki Otani, National Defense Medical College (Japan)
Kenji Itoh, National Defense Medical College (Japan)
Miya Ishihara, National Defense Medical College (Japan)

Published in SPIE Proceedings Vol. 9708:
Photons Plus Ultrasound: Imaging and Sensing 2016
Alexander A. Oraevsky; Lihong V. Wang, Editor(s)

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