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Method for measuring sound velocity in bone by two-way approach method

A technology of approximation method and sound velocity, which is applied in the field of measurement, can solve the problems affecting the practicality of the measurement method and the complexity of four-element simultaneous equations, and achieve the effect of eliminating interference

Active Publication Date: 2011-01-12
宏扬(河北)医疗器械有限公司
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Problems solved by technology

But the ensuing problem is how complicated it is to solve a four-element simultaneous equation system including three trigonometric functions, even if one of the variables V S Replaced by an empirical constant, but still can not solve the complexity of its solution process, correspondingly, it also affects the practicability of this measurement method

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  • Method for measuring sound velocity in bone by two-way approach method
  • Method for measuring sound velocity in bone by two-way approach method
  • Method for measuring sound velocity in bone by two-way approach method

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Embodiment Construction

[0034] It can be seen from the background technology that when the ultrasonic waves are emitted to the bone surface, like other types of waves, a refraction phenomenon similar to light will occur when going from an acoustically thinner material to an acoustically denser material, and most of the sound waves will scatter away after being refracted by the bone surface. , only the sound wave emitted to the bone surface along a certain angle α, its refraction direction is just parallel to the bone surface, and after advancing for a certain distance on the bone surface, it is reflected from the bone surface at the same exit angle α, we can use This is the part (see figure 1 ), the incident angle α is called the critical angle. The incident angle α is also the inclination angle of the working surface of the transducer in the ultrasonic transmitter receiver. Since this beam of ultrasound travels longitudinally along the bone surface, we can calculate the sound velocity of the ultras...

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Abstract

The invention relates to a method for measuring the sound speed inside the bone in the field of measuring technology. It comprises the following steps: arranging four sending-receiving units which can send and receive the hypersonic on the outer surface of a period of bone with the order: A1, A2, B1, and B2 in side a probe casing, arranging L as the distance between A1 and A2, B1 and B2 so as to send and receive the hypersonic between A1 and A2, B1 and B2 with the time parameter: T1, T2, T3 and T1',T2',T3'. When T1=T2', the spreading speed of the hypersonic is V=L / delta T inside the bone.

Description

technical field [0001] The invention relates to a method for measuring the propagation velocity of ultrasonic waves in bones, and belongs to the field of measurement technology. Background technique [0002] Skeleton is an important part of the human body, and it plays an indispensable role in the movement, growth and development of the human body. However, due to factors such as aging, external damage, and tumors, bone mass will change. Therefore, the determination of bone mineral density is an important monitoring index in clinical medicine. [0003] Ultrasound is a sound wave with a frequency above 20KHz that is beyond the hearing of the human ear. When ultrasound propagates in different media, it has different sound velocities due to the different physical properties of the media. In other words, it has different propagation speeds in normal bones and abnormal bones, so it can distinguish osteoporosis and fracture patients. or the normal population. [0004] In 1989,...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H5/00
Inventor 王杨刘宏师磊
Owner 宏扬(河北)医疗器械有限公司
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