Vector Doppler imaging of a spinning disc ultrasound Doppler phantom.
Vector Doppler methods are used to obtain angle independent in-plane velocity information. Velocity magnitude as well as direction are reconstructed from regular steered colour flow and from split-aperture Doppler acquisitions. Spatially resolved in-plane velocity was obtained through Doppler colour flow mode and subsequent data triangulation. A depth-invariant constant Doppler angle was achieved by using a depth expanding transmit-receive Doppler aperture. Velocities of up to 50 cm s(-1) and 360 degrees vector velocity directions were measured. This was achieved by creating a spinning solid disc phantom. Such a phantom was built to allow underwater mounting and spinning of a solid disc-shaped ultrasound phantom (maximum velocity of 50 cm s-1). Doppler triangulation was realised by steered Doppler and by a split-aperture approach. Results of both imaging methods are shown. Split-aperture results showed errors of less then 10% for velocity magnitude estimation and less then 2.5 degrees for directional information.
Kripfgans
Oliver D
OD
Department of Radiology, University of Michigan, Ann Arbor, Michigan 48109-0553, USA. greentom@umich.edu
Rubin
Jonathan M
JM
Hall
Anne L
AL
Fowlkes
J Brian
JB
D006801:Humans; D007090:Image Interpretation, Computer-Assisted; D009068:Movement; D019047:Phantoms, Imaging; D018615:Ultrasonography, Doppler, Color / Q000295:instrumentation / Q000379:methods*