按照惯例,人们采用两种截然不同的方案,通过接收反射声波的范围来获得增益的变化,以便在标准B超成象系统中补偿组织衰减。第一种技术方案采用一个可变增益放大器或具有60～70dB增益变化功能的放大器。以便在设置任何增益的情况下都能维持40dB的信号动态范围。第二种技术方案采用一次对数来压缩所接收的反射声波的全部 Traditionally, two distinct approaches have been adopted to obtain gain changes by receiving a range of reflected acoustic waves to compensate for tissue attenuation in a standard B-ultrasound imaging system. The first solution uses a variable gain amplifier or amplifier with a gain of 60-70 dB. In order to set the gain of any case can maintain 40dB signal dynamic range. The second solution uses one logarithm to compress all of the received reflected sound waves