Patent ID: 8951196
Filing Date: 2015-02-10
Classification: A61B

Abstract:
1. An ultrasonic diagnostic apparatus which has a single B mode and a complex scan mode, comprising: a probe configured to transmit an ultrasonic beam having a transmission pulse and receive a reflection wave of the ultrasonic beam reflected from a tissue of a biological body; a pulser configured to generate the transmission pulse; a drive amplifier configured to amplify the transmission pulse to produce an output amplitude; and a low-pass filter configured to filter the reflection wave, wherein the drive amplifier amplifies each transmission pulse in the complex scan mode so that the output amplitude of the each transmission pulse of the complex scan is the same, and the output amplitude of the each transmission pulse of the complex scan is different from the output amplitude of the transmission pulse in the single B mode, and a filter characteristic of the low-pass filter varies depending on the output amplitude of the transmission pulse of the ultrasonic beam as follows: if the output amplitude of the ultrasonic beam is greater than a threshold value, the filter characteristic of the low-pass filter is switched to a first low-pass characteristic; if the output amplitude of the ultrasonic beam is equal to or smaller than the threshold value, the filter characteristic of the low-pass filter is switched to a second low-pass characteristic; and a cutoff frequency of the second low-pass characteristic is lower than a cutoff frequency of the first low-pass characteristic.