High frame rate photoacoustic computed tomography using coded excitation

Masataka Azuma, Haichong K. Zhang, Kengo Kondo, Takeshi Namita, Makoto Yamakawa, Tsuyoshi Shiina

研究成果: Conference contribution

1 被引用数 (Scopus)


Photoacoustic Computed Tomography (PACT) records signals from a wide range of angles to achieve uniform, highresolution images. A high-power laser is generally used for PACT, but the long acquisition time with a single probe is a problem due to the low pulse-repetition frequency (PRF). For PACT, this degrades image resolution and contrast because it is hard to scan with a small step interval. Moreover, in vivo measurement requires a fast image acquisition system to avoid motion artifacts. The problem can be resolved by using a high PRF laser, which provides only weak energy. Averaging measured signals many times can mitigate the low signal-to-noise issue, but the PRF is restricted by the acoustic time of flight, so this is a new source of measurement time increase. Here, we present the coded-excitation approach, which we previously proposed for linear scanning, to increase the PACT frame rate. Coded excitation irradiates temporally encoded pulses and enhances the signal amplitude through decoding. The PRF is thus not restricted to acoustic time of flight. Consequently, acquisition time can be shortened by increasing PRF, and the SNR increases for the same measurement time. To validate the proposed idea, we conducted experiments using a high PRF laser with a revolving motor and compared the performance of coded excitation to that of averaging. Results demonstrated that the contamination of a signal acquired from different angles was negligible, and that the scanning pitch was remarkably improved because the start point of decoding can be set in any code in the periodic sequence.

ホスト出版物のタイトルPhotons Plus Ultrasound
ホスト出版物のサブタイトルImaging and Sensing 2015
編集者Alexander A. Oraevsky, Lihong V. Wang
出版ステータスPublished - 2015
イベントPhotons Plus Ultrasound: Imaging and Sensing 2015 - San Francisco, United States
継続期間: 2015 2月 82015 2月 10


名前Progress in Biomedical Optics and Imaging - Proceedings of SPIE


ConferencePhotons Plus Ultrasound: Imaging and Sensing 2015
国/地域United States
CitySan Francisco

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 生体材料
  • 原子分子物理学および光学
  • 放射線学、核医学およびイメージング


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