Changes in the echoes from ultrasonic contrast agents with imaging parameters

摘要: Current harmonic imaging scanners transmit a narrowband signal that limits spatial resolution in order to differentiate the echoes from tissue microbubbles. Because is particularly important applications, including mapping vessel density tumors, we explore use of wideband signals contrast imaging. It first demonstrated microspheres can be destroyed using one or two pulses ultrasound. Thus, temporal processing strategies change echo over time used bubbles and tissue. Echo parameters, intensity spectral shape for transmission, are then evaluated. Through these experiments, received after transmission shown at least as large larger. In each case, increases nonlinear fashion comparison with transmitted intensity. Although multiples wave center frequency larger insonation, insonation demonstrate broadband spectrum significant amplitude very wide range frequencies.