High-accuracy non-cross-infection wet type instrument and method for bone mineral density ultrasonic imaging

Abstract

The invention discloses a high-accuracy non-cross-infection wet type instrument for bone mineral density ultrasonic imaging, which comprises an ultrasonic energy converter, a limiter, an analogue switch, a filter, a numerical control gain amplifier, an analog-digital converter, a memorizer, a digital signal processor, a microprocessor, a signal source, a driver, a power level, a stepping motor, an X-Y two-dimension scanning module, a vacuum degassing water generator, a man-machine interaction device, a power supply device and a concave water tank for holding an ankle part to be detected. The instrument is used for measuring the digital ultrasonic quantitative parameters (QUS, Quantitative Ultrasound) of calcaneus, including BUA (Broadband Ultrasound Attenuation) and SOS (Speed of Sound), can measure real thickness of the calcaneus, eliminate influence of soft tissues on SOS, and provide degassed water for wet type measurement so as to provide high-accuracy bone mineral density value; by using a thin sock which is10 micrometers thick and made of silica gel and the like, cross infection can be eradicated; and the digitalized image of the calcaneus can be obtained by X-Y two-dimension scanning, and the imaging area of the calcaneus is 60*60 mm.

Description

technical field [0001] The invention relates to a portable ultrasonic bone densitometer, in particular to a wet-type ultrasonic imaging bone densitometer with high precision, no cross-infection and capable of providing degassed water required by itself. Background technique [0002] Osteoporosis is a disease that seriously endangers human beings. In the United States, this disease causes 1.5 million fractures every year, costing up to 10 billion U.S. dollars; in China, it is estimated that there are more than 90 million people with osteoporosis. With the development of China's economy, the average life expectancy increases, and the aging trend of the population worsens, the incidence of osteoporosis is bound to increase rapidly, which seriously threatens the health of the elderly and causes a substantial increase in social medical costs. [0003] Osteoporosis is known as the silent killer because at the beginning of the disease, patients cannot feel the bone loss is slowly ...

AI Technical Summary

Problems solved by technology

[0006] The wet ultrasonic bone densitometer needs to immerse the heel of the subject in the water of the concave sink, which is characterized by high measurement accuracy (compared to the dry type), can control the water temperature, and measure at a constant temperature; but at the same time it brings two main Disadvantages: First, there is a great possibility of cross-infection of skin diseases such as beriberi; second, to overcome one of the shortcomings, the wet ultrasonic bone densitometer has a built-in water exchange system

Compared with the wet system, the dry ultrasonic bone densitometer has the following disadvantages: (1) The short-term accuracy of the dry and wet measurements is good, but the long-term accuracy of the dry measurement is lower than that of the wet measurement

The reasons are: water is the best coupling medium, and the bubbles in the specific ultrasonic glue will affect the accuracy of the measurement; dry measurement cannot control the temperature of the ultrasonic glue as the couplant, and the transmission speed of the ultrasonic wave in the couplant is affected by Effect of temperature

(2) The correlation between dry measurement parameters and bone density is lower than that of wet measurement. For example, the T value provided by dry measurement is one standard deviation more than that of wet measurement.

(4) Dry measurement does not provide digital images of the calcaneus. It is a fixed-point measurement and cannot provide the status of the entire calcaneus.

[0008] In addition, many existing commercialized wet and dry ultrasonic bone densitometers assume that the heel soft tissue covers less and ignores the thickness of the soft tissue, which will inevitably lead to measurement errors, because the speed of ultrasound in the calcaneus and soft tissue SOS is different

[0009] Therefore, how to integrate the advantages of wet and dry ultrasonic bone densitometers and overcome their shortcomings, especially to eradicate cross-infection of skin diseases such as beriberi, is a great challenge

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