Correction of ultrasonic wave aberration with a time delay and amplitude filter.

摘要: Two-dimensional simulations with propagation through two different heterogeneous human body wall models have been performed to analyze correction filters for ultrasonic wave aberration due forward propagation. The each produce most of the characteristic effects such as phase aberration, relatively strong amplitude and waveform deformation. Simulations from a point source in focus (60 mm) 20 mm transducer were performed. Center frequency pulse was 2.5 MHz. Corrections aberrations introduced by evaluated reference corrections obtained optimal filter: generalized frequency-dependent filter [Angelsen, Ultrasonic Imaging (Emantec, Norway, 2000), Vol. II]. Two applied, time delay filter, filter. Results showed that produced substantial reduction both cases. A even better cases, gave close ideal situation (no aberration). results also indicated effect very sensitive accuracy arrival fluctuations estimate, i.e.,