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目的设计并实现一种便携式A/P型眼科超声生物测量系统。方法硬件结构包括10 MHz和20 MHz超声发射电路,分别用于A型和P型超声波测量。回波信号经放大后进行200 MHz、12 bits的模数转换,所获得的数字信号通过现场可编程门阵列(FPGA)实现相应的数字信号处理。使用计算机的一个通用串行总线(USB)接口所提供的5 V、500 m A作为整个硬件系统的供电。计算机软件系统包括人机界面设计、数据捕获、显示及打印等功能。结果在长105 mm、宽40 mm的PCB线路板上实现了高频超声信号的发射、采集与数字信号处理,并通过USB接口连接计算机,完成数据信息的传输与控制。结论设计的便携式眼科超声生物测量系统携带方便,系统兼容,数据可靠,完全可以满足临床应用要求。
Objective To design and implement a portable A / P type ophthalmic ultrasound biometry system. Methods The hardware architecture includes 10 MHz and 20 MHz ultrasound transmit circuits for Type A and P ultrasound measurements respectively. Echo signal after amplification 200 MHz, 12 bits of analog-digital conversion, the digital signal obtained through the field programmable gate array (FPGA) to achieve the corresponding digital signal processing. Use 5 V, 500 m A, provided by one of the computer’s Universal Serial Bus (USB) interfaces, to power the entire hardware system. Computer software system includes man-machine interface design, data capture, display and print functions. Results The transmission, acquisition and digital signal processing of high frequency ultrasonic signals were realized on a 105 mm PCB with a width of 40 mm and connected to a computer via a USB interface to complete the transmission and control of data information. Conclusion The designed portable ophthalmic ultrasound biometric system is easy to carry, system compatible and data reliable, which can fully meet the clinical application requirements.