title: A simulation study of sample volume sensitivity for oblique pulsed finite beam insonation of Doppler ultrasound flow phantom cylindrical vessels.
abstract: Our previous analysis of the lumen pressure in Doppler ultrasound flow phantoms subject to continuous wave, infinite beam excitation is extended here to consider the pressure and Doppler sample volume complex sensitivity within a range of solid absorbent tubes typical of those used in Doppler ultrasound flow phantoms insonated with a focussed pulsed ultrasound beam. The beam may be incident on the cylindrical shell from any angle and with any offset from the shell axis. The examples considered are of a 5 MHz beam with a 6 dB lateral fullwidth of 1 mm at the focus and a transducer surface acceleration pulse with standard deviation of 1 micros propagating through 10 mm outer diameter, 8 mm inner diameter, Cflex, low-density polyethylene (LDPE), high-density polyethylene (HDPE), and polymethylmethacrylate (PMMA) shells surrounded by water at various beam-vessel angles. Our results confirm earlier analyses suggesting that PMMA, being less well matched to the surrounding media, causes much greater distortion of the sample volume sensitivity than Cflex.
authors.affiliation: School of Informatics, University of North Wales, Bangor, LL57 1UT, UK. robin@informatics.bangor.ac.uk
authors.forename: Robin
authors.initials: R
authors.lastname: Steel
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Fish
mesh_terms: D001783:Blood Flow Velocity; D001794:Blood Pressure; D001808:Blood Vessels / Q000000981:diagnostic imaging*; D003198:Computer Simulation; D004548:Elasticity; D005583:Fourier Analysis; D006439:Hemodynamics; D008955:Models, Cardiovascular; D019047:Phantoms, Imaging; D010969:Plastics; D020959:Polyethylene; D019904:Polymethyl Methacrylate; D012680:Sensitivity and Specificity; D018617:Ultrasonography, Doppler, Pulsed / Q000295:instrumentation* / Q000379:methods*; D014867:Water
chemical_list: D010969:Plastics; D014867:Water; D020959:Polyethylene; D019904:Polymethyl Methacrylate