TY - GEN
T1 - Displacement estimation of arterial wall from multiple directions by utilizing diverging transmit beam for synthetic aperture ultrasound imaging
AU - Hasegawa, Hideyuki
AU - Kanai, Hiroshi
PY - 2013
Y1 - 2013
N2 - Measurement of elasticity of the arterial wall is useful for diagnosis of atherosclerosis. We developed an axial displacement estimator for measurement of regional motion and deformation of the arterial wall in the arterial longitudinal section. However, this method cannot be applied to the arterial cross section because the direction of motion due to an increment of blood pressure coincides with the axial direction only at the ultrasonic beam which passes through the central axis of the artery. In the present study, a method using spherically diverging beams from virtual point sources behind an array was examined for synthetic aperture imaging and displacement vector estimation. Diverging beams were produced by sequentially activating array elements from center to edges of an aperture (composed of 96 elements). For each transmission, 61 receiving beams (RBs) were created at angular intervals of 1 degree. The transmit aperture was stepped in the lateral direction at a pitch of 0.2 mm to perform 97 transmissions sequentially. For synthetic aperture imaging, all receiving beams were used (overlapped beams were compounded), and receiving beams from -25 to 25 degrees at intervals of 5 degrees were used to estimate the displacement at a point of interest from multiple directions. In a B-mode image of a urethane phantom obtained by synthetic aperture imaging using diverging beams, echoes from interfaces are imaged in a wider region compared to conventional linear scanning. Also, displacement vectors in the cross section of the phantom could be estimated by the proposed method. Synthetic aperture imaging and estimation of the displacement from multiple directions was possible using diverging transmit beam from virtual point sources.
AB - Measurement of elasticity of the arterial wall is useful for diagnosis of atherosclerosis. We developed an axial displacement estimator for measurement of regional motion and deformation of the arterial wall in the arterial longitudinal section. However, this method cannot be applied to the arterial cross section because the direction of motion due to an increment of blood pressure coincides with the axial direction only at the ultrasonic beam which passes through the central axis of the artery. In the present study, a method using spherically diverging beams from virtual point sources behind an array was examined for synthetic aperture imaging and displacement vector estimation. Diverging beams were produced by sequentially activating array elements from center to edges of an aperture (composed of 96 elements). For each transmission, 61 receiving beams (RBs) were created at angular intervals of 1 degree. The transmit aperture was stepped in the lateral direction at a pitch of 0.2 mm to perform 97 transmissions sequentially. For synthetic aperture imaging, all receiving beams were used (overlapped beams were compounded), and receiving beams from -25 to 25 degrees at intervals of 5 degrees were used to estimate the displacement at a point of interest from multiple directions. In a B-mode image of a urethane phantom obtained by synthetic aperture imaging using diverging beams, echoes from interfaces are imaged in a wider region compared to conventional linear scanning. Also, displacement vectors in the cross section of the phantom could be estimated by the proposed method. Synthetic aperture imaging and estimation of the displacement from multiple directions was possible using diverging transmit beam from virtual point sources.
UR - http://www.scopus.com/inward/record.url?scp=84894368411&partnerID=8YFLogxK
U2 - 10.1109/ULTSYM.2013.0391
DO - 10.1109/ULTSYM.2013.0391
M3 - 会議への寄与
AN - SCOPUS:84894368411
SN - 9781467356862
T3 - IEEE International Ultrasonics Symposium, IUS
SP - 1537
EP - 1540
BT - 2013 IEEE International Ultrasonics Symposium, IUS 2013
T2 - 2013 IEEE International Ultrasonics Symposium, IUS 2013
Y2 - 21 July 2013 through 25 July 2013
ER -