TY - JOUR
T1 - Estimation of speed of sound using coherence factor and signal-to-noise ratio for improvement of performance of ultrasonic beamformer
AU - Sannou, Fumitada
AU - Nagaoka, Ryo
AU - Hasegawa, Hideyuki
N1 - Publisher Copyright:
© 2020 The Japan Society of Applied Physics.
PY - 2020/7/1
Y1 - 2020/7/1
N2 - Ultrasound beamforming is an indispensable process to obtain an ultrasound image. In the conventional ultrasonography, the speed of sound (SoS) in tissue is assumed to be constant to calculate the distance from the scattering point to each ultrasonic transducer element. However, the spatial distribution of the SoS in tissue is inhomogeneous. In this study, we developed a method to estimate the distribution of the SoS. In addition, the accuracy of the proposed method was investigated using a homogeneous phantom with a known SoS distribution. Furthermore, another experiment using a wire phantom was conducted to investigate whether the spatial resolution in a resultant ultrasound image was improved with the SoS distribution estimated by the proposed method. The best spatial resolution was achieved when the size of the transmit aperture was 6.4 mm (32 elements) when both the coherence factor and signal-to-noise ratio factor were evaluated with a 7.5 MHz linear array probe.
AB - Ultrasound beamforming is an indispensable process to obtain an ultrasound image. In the conventional ultrasonography, the speed of sound (SoS) in tissue is assumed to be constant to calculate the distance from the scattering point to each ultrasonic transducer element. However, the spatial distribution of the SoS in tissue is inhomogeneous. In this study, we developed a method to estimate the distribution of the SoS. In addition, the accuracy of the proposed method was investigated using a homogeneous phantom with a known SoS distribution. Furthermore, another experiment using a wire phantom was conducted to investigate whether the spatial resolution in a resultant ultrasound image was improved with the SoS distribution estimated by the proposed method. The best spatial resolution was achieved when the size of the transmit aperture was 6.4 mm (32 elements) when both the coherence factor and signal-to-noise ratio factor were evaluated with a 7.5 MHz linear array probe.
UR - http://www.scopus.com/inward/record.url?scp=85084486788&partnerID=8YFLogxK
U2 - 10.35848/1347-4065/ab7fe7
DO - 10.35848/1347-4065/ab7fe7
M3 - 学術論文
AN - SCOPUS:85084486788
SN - 0021-4922
VL - 59
JO - Japanese Journal of Applied Physics
JF - Japanese Journal of Applied Physics
M1 - SKKE14
ER -