Decorrelation of intravascular echo signals: Potentials for blood velocity estimation

摘要: When blood particles travel through an intravascular ultrasound imaging plane, the received echo signals decorrelate at a rate that is related to flow velocity. In this paper, feasibility of extracting velocity from decorrelation function radio frequency was investigated theoretical analysis and computer simulation. A model based on impulse response method developed generate field 30-MHz transducer. The due scatterer displacement as well other nonmotion sources were studied. simulations show linearly lateral displacement. monotonic relationship between correlation provides possibilities estimate with measurements. Because complexity beam profile in near field, assessment local velocities requires detailed knowledge each axial position. Sources signal than may cause bias For localized estimation, measurement variations small range windows present major challenge. An approach multiple measurements should be adopted order reduce variations. conclusion, results study suggest it feasible measure by quantifying blood.