| 摘要 |
<p>In an ultrasonic diagnostic apparatus, the center frequency of the spectrum of the received echo signal is decreased, depending upon the penetration depth of the patient. This phenomenon is noticeable when the frequency of the excited ultrasonic waves is selected to a higher range. The ultrasonic diagnostic apparatus (100) employs an STC circuit (19), a gain of which is varied in accordance with the penetration depth of the patient. i</p> |
