1.Innovative ultrasound transducers-purewave crystal technology and its applications.
Shao-ping CAO ; Hong-qing GU ; Guo-jun SUN ; Jia-yi FENG
Chinese Journal of Medical Instrumentation 2005;29(5):360-367
This article is to introduce the dramatic improvements in efficiency, sensitivity and bandwidth of the ultrasound transducers--PureWave Crystal Technology.
Signal Processing, Computer-Assisted
;
Transducers
;
Ultrasonics
;
instrumentation
2.Study and compare of the bidirectional filtering technique for anti-baseline drift.
Lingfeng KONG ; Daxue WEI ; Yunpeng LIAO
Chinese Journal of Medical Instrumentation 2010;34(4):263-265
Several digital filtering techniques for correcting baseline drift from ECG signals are presented. A bidirectional filter is introduced, which can cantain baseline drift their filtering performance and realization methods are compared.
Electrocardiography
;
instrumentation
;
methods
;
Filtration
;
instrumentation
;
Signal Processing, Computer-Assisted
;
instrumentation
3.Research on metrological verification and the development of the verification equipment for digital electrocardiographs.
Cheng-hua DUAN ; Jian-ge JIA ; Ying-xue LI ; Xin-an DUAN ; Shu-wang ZHANG
Chinese Journal of Medical Instrumentation 2005;29(5):349-351
In order to guarantee that digital electrocardiographs with an adequate accuracy and reliabity are available for measurements in clinical practice, it is very important to determine the metrological characteristics, methods and to develop the equipments for verification. This paper elaborates the basic functions, specification, schematic drawing and key techniques of calibration equipments as well as test items for digital electrocardiographs.
Electrocardiography
;
instrumentation
;
methods
;
Equipment Design
;
Signal Processing, Computer-Assisted
;
instrumentation
4.An ultra-low power, wearable, long-term ECG monitoring system with mass storage.
Na LIU ; Yingmin CHEN ; Wenzan ZHANG ; Zhangyuan LUO ; Xun JIN ; Weihai YING
Chinese Journal of Medical Instrumentation 2012;36(1):28-31
In this paper, we described an ultra-low power, wearable ECG system capable of long term monitoring and mass storage. This system is based on micro-chip PIC18F27J13 with consideration of its high level of integration and low power consumption. The communication with the micro-SD card is achieved through SPI bus. Through the USB, it can be connected to the computer for replay and disease diagnosis. Given its low power cost, lithium cells are used to support continuous ECG acquiring and storage for up to 15 days. Meanwhile, the wearable electrodes avoid the pains and possible risks in implanting. Besides, the mini size of the system makes long wearing possible for patients and meets the needs of long-term dynamic monitoring and mass storage requirements.
Electrocardiography, Ambulatory
;
instrumentation
;
Signal Processing, Computer-Assisted
;
instrumentation
5.Development of a transmitting and echo receiving system for high frequency ultrasonic imaging.
Si-Yuan TANG ; Yue-Jie LI ; Jun YANG ; Jian-Jun JI
Chinese Journal of Medical Instrumentation 2008;32(1):26-28
A transmitting and receiving system used in high frequency ultrasound imaging is introduced and has been used for image collection of 10MHz, 20MHz and 50MHz HF ultrasonic imaging equipment. Its experimental results show that this transmitting and receiving system is capable of obtaining a better quality of medical images.
Equipment Design
;
Signal Processing, Computer-Assisted
;
instrumentation
;
Ultrasonography
;
instrumentation
;
methods
6.Image processing system of visual prostheses based on digital signal processor DM642.
Chengcheng XIE ; Yanyu LU ; Yun GU ; Jing WANG ; Xinyu CHAI
Chinese Journal of Medical Instrumentation 2011;35(5):330-334
This paper employed a DSP platform to create the real-time and portable image processing system, and introduced a series of commonly used algorithms for visual prostheses. The results of performance evaluation revealed that this platform could afford image processing algorithms to be executed in real time.
Algorithms
;
Image Processing, Computer-Assisted
;
instrumentation
;
methods
;
Signal Processing, Computer-Assisted
;
instrumentation
;
Visual Prosthesis
7.Study for portable dynamic ECG monitor and recorder.
Pengcheng YANG ; Yongqin LI ; Bihua CHEN
Chinese Journal of Medical Instrumentation 2012;36(5):329-332
This Paper presents a portable dynamic ECG monitor system based on MSP430F149 microcontroller. The electrocardiogram detecting system consists of ECG detecting circuit, man-machine interaction module, MSP430F149 and upper computer software. The ECG detecting circuit including a preamplifier, second-order Butterworth low-pass filter, high-pass filter, and 50Hz trap circuit to detects electrocardiogram and depresses various kinds of interference effectively. A microcontroller is used to collect three channel analog signals which can be displayed on TFT LCD. A SD card is used to record real-time data continuously and implement the FTA16 file system. In the end, a host computer system interface is also designed to analyze the ECG signal and the analysis results can provide diagnosis references to clinical doctors.
Electrocardiography, Ambulatory
;
Equipment Design
;
Signal Processing, Computer-Assisted
;
instrumentation
8.Portable ECG measuring system with non-contact electrode.
Xudong ZHANG ; Chen LIU ; Qiangqiang CUI
Chinese Journal of Medical Instrumentation 2014;38(3):168-185
Heart disease is the major disease that threaten human health. ECG is an important tool for the diagnosis of cardiac disease. As traditional ECG measurement devices have many disadvantages, a non-contact ECG measurement system was designed. With the non-contact electrode based on capacitive coupling, the signals were collected and then they were amplified and filtered. The conditioned analog signal was converted to digital data which was sent to the mobile terminal through bluetooth. Finally, the ECG data was analyzed to extract the key ECG parameters. The results showed that the precise ECG signals can be got with the non-contact electrode and the key ECG parameters can be acquired accurately.
Electrocardiography, Ambulatory
;
instrumentation
;
Electrodes
;
Equipment Design
;
Signal Processing, Computer-Assisted
9.Research of adaptive notch filter based on QRD-LS algorithm for power line interference in ECG.
Shuyan WANG ; Jian DONG ; Xin GUAN
Journal of Biomedical Engineering 2008;25(5):1044-1047
In this paper, an adaptive notch filter based on QRD-LS algorithm for power line interference in ECG is researched. It can automatically eliminate the power line interference in order to improve the signal-to-interference ratio. Furthermore, QLD-LS algorithm, which is recursive least-squares minimization using systolic arrays, is employed to adjust the weight vector. Compared with the adaptive notch filter based on LMS (least mean square) algorithm, it has good robustness. Simulation examples confirm the results. QRD-LS adaptive notch filter has better performance in comparison with LMS method.
Algorithms
;
Artifacts
;
Electrocardiography
;
methods
;
Humans
;
Signal Processing, Computer-Assisted
;
instrumentation
10.Application of the mixed programming with Labview and Matlab in biomedical signal analysis.
Lu YU ; Yongde ZHANG ; Xianzheng SHA
Chinese Journal of Medical Instrumentation 2011;35(1):15-18
This paper introduces the method of mixed programming with Labview and Matlab, and applies this method in a pulse wave pre-processing and feature detecting system. The method has been proved suitable, efficient and accurate, which has provided a new kind of approach for biomedical signal analysis.
Heart Rate
;
Signal Processing, Computer-Assisted
;
instrumentation
;
Software