ULTRASONIC DIAGNOSTIC APPARATUS

• Main Author: WATANABE GENICHI
• Format: Patent
• Language: English
• Published: 30.01.1996
• Edition: 6
• Subjects: DIAGNOSIS; HUMAN NECESSITIES; HYGIENE; IDENTIFICATION; MEDICAL OR VETERINARY SCIENCE; SURGERY

PURPOSE:To finely and automatically perform adjustment of brightness by comparing the output signal at each depth with a specified comparative value in an image data in each transmitting and receiving wave direction output from an echo amplification part and controlling the gain of the echo amplification part based on the result of comparison. CONSTITUTION:An addition and subtraction controlling signal generating part 8 generates an addition and subtraction controlling signal and a difference value signal based on output signals of a satd. level comparing part 5, an image level comparing part 6 and a noise level comparing part 7 and inputs them into an addition and subtraction ratio generating part 9. The addition and subtraction ratio generating part 9 inputs the addition and subtraction signal and the difference ratio value signal into an addition and subtraction operating part 10 based on the output signals from this addition and subtraction signal, the difference signal and the echo amplification part 4. The addition and subtraction operating part 10 performs addition and subtraction to an STC signal based on this difference ratio value signal and an STC signal value from the time gain controlling signal generating part 12 to store automatically gain data in the gain memory part 11. The time gain controlling signal generating part 12 generates the STC signal based on automatic gain data to change the gain an echo-amplification part 4 with time.