Frijlink, M.E.

imaging frequency transducer ultrasound signal catheter tissue image contrast agent pressure pulse 40 mhz chapter nonlinear plaque study experiment system vessel artery intravascular vasa vasorum result 20 mhz stent element vasorum effect amplitude goertz range ivus catheter lumen layer detection distance ultrasound med biol simulation figure field level h 40 mode van der steen function attenuation resolution response blood rotation aorta propagation region angle atherosclerotic measurement acquisition ultrason depth motion hydrophone technique ratio application material steen contrast agent scatterer subharmonic power feasibility order artifact method point ivus element control prototype dual-frequency sensitivity