TY - GEN
T1 - Plane-Wave Phase Coherence Imaging with Singular Value Decomposition
AU - Hasegawa, Hideyuki
AU - Nagaoka, Ryo
N1 - Publisher Copyright:
© 2018 IEEE.
PY - 2018/12/17
Y1 - 2018/12/17
N2 - Recently, various adaptive imaging methods have been studied extensively for the improvement of ultrasound image quality. Some of those methods utilize the coherence among ultrasonic echo signals received by individual transducer elements in an ultrasonic probe. Such methods would be of value also for high frame-rate ultrasonic imaging because image quality is degraded due to unfocused transmit beams, such as plane and diverging transmit beams. In the present study, effects of sub-aperture delay-and-sum (DAS)beamforming and singular value decomposition (SVD)on the coherence-based imaging methods, i. e., coherence factor (CF)and phase coherence factor (PCF), were examined in high frame-rate plane-wave imaging. The performance of the proposed method was examined by phantom experiments in terms of the spatial resolution and image contrast. Sub-aperture beamforming improved the lateral spatial resolution and image contrast in PCF imaging but degraded that in CF imaging slightly. However, the visibilities of speckle echoes from diffuse scattering medium relative to echoes from strong scatterers were improved by sub-aperture beamforming in both imaging methods. SVD improved the spatial resolution significantly in both imaging methods, while it did not change image contrast so much. The performances of the coherence-based imaging methods could be controlled by combination of sub-aperture beamforming and SVD. Such characteristics of the proposed method would be beneficial for the improvement of image quality in high frame-rate plane-wave imaging.
AB - Recently, various adaptive imaging methods have been studied extensively for the improvement of ultrasound image quality. Some of those methods utilize the coherence among ultrasonic echo signals received by individual transducer elements in an ultrasonic probe. Such methods would be of value also for high frame-rate ultrasonic imaging because image quality is degraded due to unfocused transmit beams, such as plane and diverging transmit beams. In the present study, effects of sub-aperture delay-and-sum (DAS)beamforming and singular value decomposition (SVD)on the coherence-based imaging methods, i. e., coherence factor (CF)and phase coherence factor (PCF), were examined in high frame-rate plane-wave imaging. The performance of the proposed method was examined by phantom experiments in terms of the spatial resolution and image contrast. Sub-aperture beamforming improved the lateral spatial resolution and image contrast in PCF imaging but degraded that in CF imaging slightly. However, the visibilities of speckle echoes from diffuse scattering medium relative to echoes from strong scatterers were improved by sub-aperture beamforming in both imaging methods. SVD improved the spatial resolution significantly in both imaging methods, while it did not change image contrast so much. The performances of the coherence-based imaging methods could be controlled by combination of sub-aperture beamforming and SVD. Such characteristics of the proposed method would be beneficial for the improvement of image quality in high frame-rate plane-wave imaging.
UR - http://www.scopus.com/inward/record.url?scp=85060639644&partnerID=8YFLogxK
U2 - 10.1109/ULTSYM.2018.8579969
DO - 10.1109/ULTSYM.2018.8579969
M3 - 会議への寄与
AN - SCOPUS:85060639644
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 -