Showing papers in "Chinese Medical Equipment Journal in 2006"

Fusion arithmetic and result analysis of CT-MRI images

Abstract: Multi-modality medical image fusion technology has become an important development along with the advancement of image equipments and various medical imaging modes,and has been used in diagnoses and therapy gradually.In this paper,the familiar CT-MRI images are fused by different arithmetic,and the result sare analyzed.

Large-scale hospital information system in clinical practice

Abstract: This paper studies the seamless integration of the core system of HIS, PACS, LIS and Pharmacy Information Sytem. Clinician workstation is established, and thus the image and text information of the patient can be accessed and captured by means of EPR and data integration is fulfilled according to DICOM and HL7.

Time-frequency analysis of ECG signals

Abstract: In this paper,a time-frequency approach is used for the recognition and analysis of ECG signals for a normal or an abnormal patient.An iterative deconvolution procedure is applied to calculate the time-frequency representations.This method can enhance the resolutions of the signals.

Research on intelligent non-destructive diagnostic instrument for coronary artery disease(CAD)

Abstract: Based on the domestic and international research in the past few decades,we present an intelligent non-destructive diagnostic instrument for coronary artery disease(CAD).This instrument analyses the multi-channel heart sounds of patients who have coronary artery disease and combines other information about CAD,then wavelet analysis,artificial neural network and pattern recognition technology are also used.The result of clinic application indicates that this instrument has certain reference value to the diagnosis of CAD and provides potential possibility of general examination.

Continuous measurement of blood pressure using pulse wave transit time

Abstract: A continuous noninvasive method for blood pressure (BP) estimation by pulse wave transit time (PWTT) is described. A constant linear relation is available between PWTT and BP, but characteristic parameter for the relation is different for different persons. According to hydrostatics, BP in some vessel changes with different body postures. In this paper, the difference, i.e. △BP, between two BP values with different body postures is gained. ECGs and surface pulse waves are also obtained, and then values of PWTT are calculated. Through the A BP and PWTT acquired above, parameter b of BP equation can be determined, and then parameter a is computerized through the measurements and one BP value. Thus a BP equation is got, which can be used to estimate BP values through continuous measurement of PWTT. Compared with the value from invasive BP measurement, the value from this method has an error rate less than 5%. The method is feasible for noninvasive continuous BP monitoring.

Pulse signal feature extraction and analysis based on wavelet transform

Abstract: Wavelet transform is applied to synchronous extraction and analyses for time -domain feature values and frequency-domain ones of pulse signals for its advantages on time-frequency localization and saltation site detection of non-stationary signal. The energy feature of the pulse on different time scales is selected as the new feature value to distinguish the pulse. With this new feature value, the recognition rate for such basic pulses as fast pulse, slow pulse, feeble pulse, hollow pulse and astringent pulse is more than 90%, and the rate for concurrent pulses is more than 82%.

Integrated denoising steps for electrocardiogram signal

Abstract: The ratio of signal-noise of the ECG(electrocardiogram) signal is low.In order to eliminate the noise in ECG,improve the performance of ECG monitors and the diagnosis efficiency of computer-aided system,various kinds of noise rejection methods have been proposed.Generally,maybe all of them are useful to the denoising in some certain,but not full.In this thesis,a series of denoising steps are introduced.As a result,a relatively original ECG waveform is detected.

Design of electro-acupuncture stimulator for hemiplegia rehabilitation

Abstract: An electro-acupuncture stimulator for hemiplegia rehabilitation is designed, which adopts 51 series of SCMs and CPLD as the control unit to fulfill parameter setup, numerical display and separated multi-channel output

An acquisition and analysis system of ECG based on LabVIEW

Abstract: A realtime system used for acquisition and analysis of ECG based on LabVIEW is presented in this paper.This realtime system can accomplish the functions such as the acquisition and display of ECG and the calculation of Instantaneous Heart Rate(IHR)and the Average Heart Rate(AHR).The system can be implemented easily.In addition,the user can modify and add functions of the system according to his needs conveniently.

Design of computer diagnosis expert system on medical laboratory

Abstract: The technology of artificial intelligence and the diagnosis of medical laboratory are combined to design a prototype of medical laboratory expert system.Adopting the present successful production rule to express the method as knowledge and using inaccurate inference engine,this prototype designs and realizes six major function module,such as "laboratory project meaning analysis",etc.It can be used as a clinical tool.

Inhomogeneous magnetic resonance image segmentation by spatial model to fuzzy clustering

Abstract: Fuzzy c-means (FCM) clustering algorithm is a popular model widely used in the segmentation of magnetic resonance image (MRI) The conventional FCM doesn't involve the spatial information of MRI and then unexpected segmentation results appear when it is applied to inhomogeneous MRI with noise and bias field Modifying the objective function of FCM and introducing a variable as the parameter to control the tight degree of neighborhood effect present a spatial model to FCM clustering algorithm The variable can reasonably use the spatial information of MRI The experiment results show that the proposed algorithm can provide a powerful segmentation than the conventional FCM and others

Fundamental study on sensitivity of medical magnetic inductive impedance imaging

Abstract: A 16-channel magnetic inductive impedance imaging system is developed. The relation between the amplitude, phase of the detected signal and the subject position is studied. High-precision techniques for amplitude discrimination and phase discrimination are applied to information acquisition. The changing rule of the amplitude and phase of the sensing signal along horizontal and vertical directions is determined, and thus the sensitivity curve is achieved. It's proved that detected signals vary regularly with different positions, and the study on regulation is useful for image reconstruction.

Measurement and clinical study of atherogenic index

Abstract: This paper describes the measuring principle and algorithm of atherogenic index with oscillometric model. The algorithm proves effective and reliable through analyses of many cases and lots of clinical tests, which has been applied to the development of Lab-VIEW-based software for clinical use. Both patients and doctors can turn to this software for the information of angiosclerosis.

Design and implementation of maintenance management system for medical equipment based on HIS

Abstract: A maintenance management system for medical equipment is developed based on HIS.The system contains some special functions(including preventive maintenance,automatic job distribution,performance assessment,etc.)which are very useful for confirming the medical equipment in proper conditions and promoting the working efficiency of the staff.The system provides a technical support for the improvement of the maintenance management level.The CS/BS combined mode is adopted so that the maintenance is exempted at the users' end,and the data operation and statistical work become convenient at the engineering department's end.Furthermore,it provides a platform for future hospital information integration.

Quality control and administration of PET-CT

Abstract: The purpose of quality control is to form a standard,scientific,and unified control system for PET-CT.The improvement of regulations is the base.The training of technicians is the key.The establishment of radiological protection rules is the assurance.So it is an important link to improve the quality control of PET-CT for better sensitivity and accuracy of PET-CT.

Requirement analysis and database design of USIS

Abstract: Based on the development and application of medical ultrasonic diagnosis information system(USIS) of Nanjing Maternity and Child Health Hospital,this article deeply expounds the requirement analysis and the database design of USIS's development.With the analyses of the distinguishing feature of ultrasonic diagnosis work flow and the design of the relational data structure of USIS,the thought and method to overcome the difficulty of data storage are proposed.

Medical image compression based on wavelet transform

Abstract: To find a wavelet-transform-based lossless compression coding method for CT and MR1 images in the store and transmission of medical image. Wavelet transform was involved in multi-resolution dissection, and then dynamic Huffman code was performed to gain expected image. Experiment results showed that this method had advantages of a high compression ratio and a high image quality.

Clinical application and trend of PET

Abstract: PET is the most advanced nuclear medical imaging equipment This paper introduces the characteristics, application and trend of PET

Signal processing in monitoring blood oxygen concentration by LMS self-adaptive arithmetic self-adaptive arithmetic

Abstract: Lives are maintained by enough oxygen.Blood oxygen saturation is one of the important parameters which reflects oxygen concentration in blood.The accurate monitoring of blood oxygen saturation is very important to both physiological research and medical application.At present,dual-wavelength method is widely adopted in noninvasive detection of blood oxygen saturation.Therefore,accurate recognition of peak-to-peak value of pulse waveform is a key process in monitoring blood oxygen saturation.In the paper,LMS self-adaptive arithmetic is applied to processing pulse waveform signal.The ratio of corrective detection is improved by the method.

Experimental investigation and numerical simulation of air distribution in the class III biosafety laboratory

Abstract: In dynamic state,the airflow and particle distribution of class Ⅲ biosafety laboratory is simulated by means of the CFDThe identical results of the simulation and the practical survey show good reliability of this experimentThe result indicates that the good unidirectional air distribution is formed in main lab and air distribution is the main factors to determine the character of particle distribution

Pulmonary Electrical Impedance Tomography System

Abstract: It is very important for pulmonary disease treatment to monitor the pulmonary function continuously. In this paper, the hardware of electrical impedance tomography (EIT) system is designed, and simulative model of human thorax is established for image reconstruction based on Landweber pre-iteration method. Compared with linear back projection, the method above results in the better image reconstruction with little trailing and increased speed of real-time reconstruction.

Application of hyaluronic acid in tissue engineering

Abstract: This paper studies the application of hyaluronic acid to artificial bone,manmade skin and restored nerve,and points out that the self-regulated releasing hyaluronic acid biomaterial will become a hot issue.

Low-power design of wireless ECG monitor

Abstract: This paper introduces the low-power design of a portable wireless ECG monitor which adopts MC35 GPRS module.At first,it presents the hardware and software system.Secondly,according to the principle of low-power design,it describes the low-power design methods from the aspects of hardware and software respectively.Finally,this paper discusses how to improve this power management system.In practice,this design efficiently reduces the power-consuming,and prolongs the working time of the monitor.

Multidetector computed tomography

Abstract: Multidetector computed tomography (CT) has transformed CT from an transaxial cross-sectional technique into a genuine 3D imaging that allows for arbitrary cut planes as well as excellent 3D displays of the volume data. Multidetector CT scanners contribute to reduced scanner time, decreased section collimation and increased scan length.

Study on automatic gain control method of pulse oxygen saturation measured

Abstract: The automatic gain control circuit is designed on the basis of MSP430F149 microcomputer with the chopper amplifier, and then continuous stepless regulation of pulse wave signal is fulfilled. Thus individual variation -induced problems are eliminated such as signal baseline drift and saturation. With this circuit, medical instruments can be portable and low-power-consumption.

Present status and trend of invasive blood pressure sensor

Abstract: This paper introduces the configuration, classification, present status and trend of invasive blood pressure sensor.

Development of detecting techniques and devices for vehicle driver fatigue

Abstract: Vehicle driver fatigue is an important factor in traffic accidents.This paper introduced three kinds of detecting techniques,namely driver's physical signals and individual characteristics,vehicle parameters,and five detecting devices.But there still are limitations of the mentioned detecting techniques and devices in the paper.The problems and developing trend are briefly analyzed.

Structure principle of blood gas analyzer and its progress

Abstract: Blood gas analyzer is very important in the diagnosis and treatment of respiratory failure,surgical operation,and emergency care.Along with the development of scientific technology,the function indexes of the analyzer also get tremendous exaltation.This text mainly comes to carry on the related study of the blood gas analyzer from following three aspects:1.The constitution of the blood gas analyzer;2.The work principle of the blood gas analyzer;3.The progress of the blood gas analyzer.