| 摘要 |
PROBLEM TO BE SOLVED: To plot the blood flow information of a weaker and finer blood vessel by reducing the influence of a signal processing means provided with a narrow dynamic range such as an A/D converter or the like in a color flow ultrasonic diagnostic device. SOLUTION: In this ultrasonic diagnostic device for processing ultrasonic wave signals from the inside of a living body, demodulating the modulation of ultrasonic waves by a flood flow, A/D converting the demodulation signals, operating a blood flow speed, distribution and power, etc., and plotting the blood flow information inside the body, a means 25 for compressing signals is provided in the prestage of a means 21 for demodulating the signals or an A/D conversion means 22. Also, a means 26 for expanding the signals after conversion is provided which expands the signals before sending them to an arithmetic part 24 and after the compressed signals are A/D converted. By using the signals after expansion from which unrequired fixed part signals are removed in an MTI filter 23, the arithmetic part 24 operates the blood flow information and color-displays the arithmetic result. |
