北京生物医学工程

便携式超声背向散射骨密度仪设计

Design of portable ultrasound bone densitometer using backscatter signal

作者：付思东唐国扬俞政涛刘晓宙何爱军

单位：南京大学电子科学与工程学院生物医学工程研究所（南京 210023）南京澳思泰生物科技有限公司（南京 210028）南京大学声学研究所近代声学教育部重点实验室（南京 210093）

关键词：背向散射; 密度仪; 现场可编程门阵列; 便携式设备; 超声

分类号：R318.6

出版年·卷·期（页码）：2018·37·2（188-192）

摘要：

目的设计基于背向散射信号来评判骨密度情况的便携式超声骨密度仪, 为实现超声骨密度仪的低成本和便携性提供一种解决方案。方法使用现场可编程门阵列 (field programmable gate array, FPGA) 作为主控以控制整个系统正常工作, 配合信号调理、高速模数转换器 (analog-to-digital converter, ADC) 和USB传输电路, 来实现高压脉冲控制模块、增益控制模块、信号采集、数据传输。最后对系统噪声和采集到的背向散射信号进行测试, 并用松质骨样本进行骨密度测量的测试。结果系统整体尺寸为15 cm×10 cm×3 cm, 数据传输速率可达60 MB/s, 噪声水平低。结论设计了一种USB接口的便携式背向散射超声骨密度仪, 在USB接口供电时, 可以有效地获取背向散射信号。

Objective Portable ultrasonic bone densitometer, using backscatter technology, was designed to provide a solution to realize the portable and the low cost for the bone densitometer. Methods The system, using field programmable gate array (FPGA) as control IC to make the system work well, worked with high-speed analog to digital converter (ADC) and high-speed USB to implement high-voltage control module, gain control module, data acquisition and data transmission. Finally, measurements for noise, backscatter signals, and bone density with cancellous bones were performed. Results The size of the whole system was 15 cm×10 cm×3 cm, the speed of data transmission was up to 60 MB/s, the noise was low. Conclusions A kind of portable ultrasound bone densitometer with a USB port was designed. When supplied by USB port, the system could acquire the backscatter signal effectively.

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