TY - GEN
T1 - Simultaneous Photoacoustic and Ultrasound Imaging Using a Hemispherical Sensor Array
AU - Takaoka, Shunto
AU - Kondo, Kengo
AU - Namita, Takeshi
AU - Yamakawa, Makoto
AU - Shiina, Tsuyoshi
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/12/17
Y1 - 2018/12/17
N2 - A hemispherical sensor array enables photoacoustic (PA) imaging with more spatially isotropic and finer vasculature than those of a planar sensor array. Combining ultrasound (US) and PA images can clarify structural relations of tissues and vessels. Although a piezoelectric element of the hemispherical sensor array can perform pulse-echo, the array is sparse because of the few channels on data acquisition systems. Therefore, beamforming cannot be applied properly: adequate US image quality is obtainable. For this study, we used mechanical scanning to increase the number of virtual elements. We also used synthetic aperture (SA) imaging to improve US image quality. They enable simultaneous PA and US measurements using a hemispherical sensor array. Measurements taken using PA and US signals from a tissue-mimicking agar phantom demonstrate that scanning sensors improved the US image contrast and the field of view compared to results obtained when a sensor is not scanned. Moreover, a PA image visualized only optical absorbers. Furthermore, combining PA and US images facilitates identification of where optical absorbers are located.
AB - A hemispherical sensor array enables photoacoustic (PA) imaging with more spatially isotropic and finer vasculature than those of a planar sensor array. Combining ultrasound (US) and PA images can clarify structural relations of tissues and vessels. Although a piezoelectric element of the hemispherical sensor array can perform pulse-echo, the array is sparse because of the few channels on data acquisition systems. Therefore, beamforming cannot be applied properly: adequate US image quality is obtainable. For this study, we used mechanical scanning to increase the number of virtual elements. We also used synthetic aperture (SA) imaging to improve US image quality. They enable simultaneous PA and US measurements using a hemispherical sensor array. Measurements taken using PA and US signals from a tissue-mimicking agar phantom demonstrate that scanning sensors improved the US image contrast and the field of view compared to results obtained when a sensor is not scanned. Moreover, a PA image visualized only optical absorbers. Furthermore, combining PA and US images facilitates identification of where optical absorbers are located.
KW - hemispherical sensor array
KW - photoacoustic imaging
KW - synthetic aperture imaging
UR - http://www.scopus.com/inward/record.url?scp=85060598782&partnerID=8YFLogxK
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U2 - 10.1109/ULTSYM.2018.8580127
DO - 10.1109/ULTSYM.2018.8580127
M3 - Conference contribution
AN - SCOPUS:85060598782
T3 - IEEE International Ultrasonics Symposium, IUS
BT - 2018 IEEE International Ultrasonics Symposium, IUS 2018
PB - IEEE Computer Society
T2 - 2018 IEEE International Ultrasonics Symposium, IUS 2018
Y2 - 22 October 2018 through 25 October 2018
ER -