title: On the spectral properties of Doppler thread phantoms.
abstract: It is shown that some of the threads used in Doppler phantoms have a repetitive structure which leads to peaks in the angular distribution of the backscattered power at beam axis-to-flow angles of theta = 90 degrees and approximately theta = 70 degrees. This nonuniform scattering does not significantly interfere with modelling the Doppler spectrum peak as a function of velocity and beam-to-thread angle, but makes it impossible to model the spectral width as a function of these parameters. A new plaited structure is described which has a periodicity too small to lead to subsidiary reflection peaks, and which has a more uniform backscattering profile than the other threads studied.
authors: Inserm, Unité 281, Lyon, France.
authors: D
authors: D
authors: Cathignol
authors: K
authors: K
authors: Dickerson
authors: V L
authors: VL
authors: Newhouse
authors: P
authors: P
authors: Faure
authors: J Y
authors: JY
authors: Chapelon
mesh_terms: D001783:Blood Flow Velocity; D004301:Doppler Effect; D008961:Models, Structural; D014465:Ultrasonics