System Calibration Method for Broadband Ultrasonic Attenuation Measuring Instrument

Abstract

The invention discloses a system calibrating method of a broadband ultrasonic attenuation measurement apparatus. The system calibrating method is characterized in that the broadband ultrasonic attenuation measurement apparatus detects frequency characteristics of a signal crossing through a bone mineral density standard sample and frequency characteristics of a signal crossing through a bone mineral density detected sample; and then calculates and obtains a bone tissue ultrasonic attenuation coefficient of the bone mineral density detected sample in relative to the bone mineral density standard sample; at last, by combining with the bone tissue ultrasonic attenuation coefficient of the bone mineral density standard sample, the bone tissue ultrasonic attenuation coefficient of the bone mineral density detected sample is obtained. According to the system calibrating method of the broadband ultrasonic attenuation measurement apparatus, an ultrasound bone mineral density standard measurement module is used for calibrating; thus the method can effectively avoid influence of water and fatty on measurement, reduce the amplifier frequency characteristic bias caused by inconsistent dynamic scale, and simplify an amplifier circuit.

Description

technical field [0001] The invention belongs to the field of medical ultrasound applications, and more specifically aims at the problems existing in the system calibration in the existing ultrasound bone density measurement, and proposes a new system calibration method to improve the measurement precision of the ultrasound bone density. Background technique [0002] Ultrasound bone densitometry is to use the change of the acoustic parameter of Broadband Ultrasound Attenuation (BUA) in the propagation of bone media to measure the density of bone minerals and further judge the osteoporosis status of the examinee. This method has the advantages of no radiation and low cost. [0003] The BUA measurement method is not complicated. Usually two ultrasonic probes are used, one is the ultrasonic transmitting probe and the other is the ultrasonic receiving probe. During the measurement process, the ultrasonic transmitting probe, the measuring sample, and the ultrasonic receiving pro...

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Problems solved by technology

[0005] However, there are two defects in this calibration method: First, the influence of water or fat on the signal is not considered effectively, so the system calibration cannot offset the influence of fat in human tissue on the measurement; second, because the ultrasonic signal enters the measurement circuit with almost no attenuation , may make the measurement amplifier enter a saturated state and cannot effectively amplify the signal, resulting in signal distortion

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