ABSTRACT
Objective: To analyze FPGA technology in diagnostic ultrasound B signal processing system in order to provide a theoretical basis for the further development of diagnostic ultrasound signal processing. Methods:Analysis of FPGA technology in diagnostic ultrasound signal processing system for the study through literature study to analyze the relevant principles. Results: FPGA to be more widely used in ultrasonic diagnostic apparatus in full. Conclusion: It comprehensively improved the reliability and flexibility of ultrasound diagnostic signal processing system, making the modular, miniature, diversification, serialization and the rapid development of digital direction.
ABSTRACT
Objective: High Intensity Focused Ultrasound (HIFU) is classified as the third category medical instruments, which means it require much more attention on its safety to patient. Methods: To achieve this goal, a safety monitor system was applied on “High Intensity Focused Ultrasound therapeutic equipment for Shallow tissue”. To design parallel port-based safety monitor method for high intensity focused ultrasound therapeutic system and make the bidirectional data flow. Results: By using parallel computation of FPGA, the safety monitor independently monitor several modules of the “Ultrasound therapeutic equipment”, and handles mal-function. A new EPP-Parallel port basic intelligent watchdog was introducing to monitor PC working state. Conclusion: The safety monitor system enhances the safety and reliability of the equipment, and provides helpful information for malfunction diagnose.
ABSTRACT
ObjectiveA general experiment platform of electrical impedance tomography(EIT) based on field programmable gate array(FPGA) was designed to meet the requirements of EIT digital measurement.A digital current source and the research on digital demodulation method was completed.MethodsFor construction of the experiment platform,DDS module,D/A and A/D interface module,digital demodulation module and RS-232 communication module were all integrated in one FPGA chip.ResultsThe source can provide multi-frequency excitation signals of 2 mA in the range of 6.1-390.6 kHz.The output impedance of the source was higher than 190 kΩ.Both the real and the virtual information of measured impedance could be extracted.ConclusionMeasurements based on bioimpedance-equivalent circuit model verified the validity of the platform.The research results of this paper provides a foundation for the construction of a practical EIT system.
ABSTRACT
ObjectiveTo design a fast fourier transform (FFT) processor to meet the needs for high-speed and real-time signal processing. MethodsA 1 024-point, 32-bit, fixed, complex FFT processor was designed based on field programmable gate array (FPGA) by using radix-2 decimation in frequency(DIF) algorithm and pipeline structure in the butterfly module and ping-pong operation in data storage unit. ResultsWhen the primary clock was 100 MHz, 1 024-point FFT calculation took about 62.95us. The processor was fast enough for processing highspeed and real-time signals. ConclusionThe results provides reference value that theoretical study of the FFT algorithm can be applied in the adaptive dynamic filter of ultrasonic diagnostic system and ultrasonic doppler flow measurement system.