Hardware System Design Of Portable Ultrasonic Diagnosis Equipment

The medical ultrasonic diagnosis technology is safe, convenient, hurtles, and inexpensive, but conventional medical ultrasonic equipment's defect consists in large size and high power consumption. The new generation portable digital ultrasonic equipment based on embedded ARM9 & FPGA hardware plat form and embedded LINUX operating system. This equipment can cost less, burn less power and achieve significantly higher performance than conventional equipments. It can carry on nimble ultrasonic data processing, thus causes further enhances the imaging quality. And all of these build the foundation of battlefield salvation and long-distance medical service, so it will develop rapidly in the future.This thesis obtains from the medical ultrasonic diagnosis principle and the design of digital ultrasonic equipment; describes the ultrasonic data processing sub-modules emphatically; makes simple introduction of the unique feature of programmable logical component, the design principle and the design flow. Next it introduces the distributed algorithm, the median filtering algorithm and time-recursive algorithm, and then describes the detailed method of realizing in FPGA and application in digital ultrasonic equipment's signal processing sub-module.On this foundation, this thesis detailedly introduced an imaging hardware system in portable digital ultrasonic equipment, this system comprises a FPGA subsystem which had the function of real-time video capture and image pre-processing and an embedded system based on ARM. The FPGA subsystem used Altera Corporation's FPGA as the central processor. It was composed of digital ultrasonic imaging beam former, dynamic FIR filters, image frame storing control module, image low-level processing module, DMA way and FPGA configuration circuit. The embedded subsystem is developed based on 32bit high performance ARM Processor S3C2440 and embedded operating system LINUX, with some general Interface (such as Ethernet, USB, RS232) expanded. Finally, it introduced an application in VGA/LCD display based on Multimedia Companion Chip SM501.This imaging system makes full use of the high performance, low power and low cost of FPGA and ARM microprocessor and the advantage of LINUX, providing an economical and practical solution for the design of portable digital ultrasonic equipment.