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Design of a 3D afterloading brachytherapy simulation system based on CT images.

Hui YU ; Hai-Rong XU ; Shu-Xu ZHANG ; Yu-Sheng SHI ; Jian-Yang QIAN

Chinese Journal of Medical Instrumentation.2008;32(2):93-107.

OBJECTIVETo design a new afterloading brachytherapy simulation system based on CT images.

METHODSThis paper mainly focuses on the anthropomorphic pelvic phantom spiled by three pipelines and the nasopharyngeal carcinoma spiled by two pipelines. Microsoft Visual C++ was used to parse CT images for some information, then to reconstruct pipelines in the body of phantom or the patient and to give the three-dimensional coordinate of dwelling points. The dose distribution displayed on CT images was processed by the dose distribution calculation methods near single afterloading source and the dose optimization methods. VTK technology was used in the 3D display in the system.

RESULTSAccording to the reference points applied by doctors, the system can calculate reversely the dwelling time of dwelling points in pipelines and get satisfying dose distribution on CT images. Besides, it can reflect the 3D relationship between the dose volume and the normal tissues.

CONCLUSIONSThis system overcomes some deficiencies of 2D afterloading brachytherapy simulation system based on X-ray films which are used widely in China. It supplies 3D display of dose distribution for clinical doctors. At present, the system is being tested in clinics.

Brachytherapy ; methods ; Computer Simulation ; Imaging, Three-Dimensional ; Software ; Tomography, X-Ray Computed

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A genetic optimization designing method for microorganism detection genechip probe based on genetic algorithm.

Guo-Chuan LIU ; Zhi-Jun BAI ; Wen-Jie SHU ; Xiao-Chen BO ; Sheng-Qi WANG ; Lin LU ; Jia-Yong WANG

Chinese Journal of Medical Instrumentation.2008;32(2):89-92.

A new automatic selection approach of microorganism specific fragment combination is presented in this paper. Genetic algorithm is used to search optimal solution on the basis of classification ability of SNP combination, which is evaluated by the rough set theory. Other related experimental parameters are also been incorporated. Experimental results show that the method can find the best SNP combination pattern efficiently and accurately, which implies that it is a reliable approach to the genechip probe design.
Algorithms ; Microbiological Techniques ; methods ; Models, Genetic ; Oligonucleotide Array Sequence Analysis ; methods

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Interactive guided breathing technology.

Zheng-Bo ZHANG ; Wei-Dong WANG ; Kai-Yuan LI ; Bu-Qing WANG ; Qing ANG

Chinese Journal of Medical Instrumentation.2008;32(2):86-119.

OBJECTScientific guided breathing technology is to be studied based on the cardiopulmonary interaction.

METHODSHeart rate variability was used as the target function to study the smoothly respiratory relaxation procedure in order to acquire the common pattern of regular and slow breathing.

RESULTSMusic based on the acquired common pattern was created and a musical pattern temporally-related to the breathing movement monitored by a sensor could be chosen to guide the breathing interactively.

Breathing Exercises ; Heart Rate ; physiology ; Humans ; Respiration

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Semantic network technology in computer-based patient records.

Xue-Min MAO ; Lei DA

Chinese Journal of Medical Instrumentation.2008;32(2):83-85.

Based on pathological lung cancer cases and semantic network technology, and in combination with UMLS, the article discusses the applications of semantic network technology in electron medical records, and its actualization of pathological case semantic network expression with sequence characteristics.
Health Records, Personal ; Semantics ; Unified Medical Language System

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A denoising method of epicardial potential mapping signals based on ICA.

Yu ZHOU ; Cui-Wei YANG ; Zu-Xiang FANG

Chinese Journal of Medical Instrumentation.2008;32(2):79-82.

A new denoising method is presented in the paper, based on the independent component analysis(ICA) and the noise independent component selection measurement which is the dispersivity of the independent component's projection coefficients to each electrode. The results indicate that the method can denoise EPM signals with giving prominence to electrodes' true depolarization signals. So it' s fit well for the EPM system.
Electrodes ; Epicardial Mapping ; methods ; Membrane Potentials ; Pericardium ; physiology

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Applications of the hospital statistics management system.

Hong ZHAI ; Yong REN ; Jing LIU ; You-Zhang LI ; Xiao-Long MA ; Tao-Tao JIAO

Chinese Journal of Medical Instrumentation.2008;32(1):64-69.

The Hospital Statistics Management System is built on an Office Automation Platform of Shandong provincial hospital system. Its workflow, role and popedom technologies are used to standardize and optimize the management program of statistics in the total quality control of hospital statistics. The system's applications have combined the office automation platform with the statistics management in a hospital and this provides a practical example of a modern hospital statistics management model.
Hospital Administration ; Hospital Information Systems ; Office Automation ; Statistics as Topic

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Design and implementation of the hospital information system with high usability.

Wen JIANG ; Shun-Fu HU

Chinese Journal of Medical Instrumentation.2008;32(1):62-67.

This paper introduces the design and implementation of the Hospital Information Systerm (HIS) with higher usability, balanced load and better safety, through a scientific construction of servers and databases, based on the application practice in Zhejiang 1st Hospital.
Databases, Factual ; Hospital Information Systems ; organization & administration ; Software Design

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Optimization of the database of the hospital information system and improvement of its performance.

Yan XUE

Chinese Journal of Medical Instrumentation.2008;32(1):58-61.

Optimization of the hospital information system (HIS) and its improvement method have been discussed in this paper. Our method is to divide the whole database into two separate sub-databases, one is for daily operation, and another is for query. We keep the daily-operation-database in a fixed size by deleting the historical data within a fixed time. So the hospital information system can run quickly, having a higher efficiency and a better safety.
Databases, Factual ; Hospital Information Systems ; organization & administration

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A comparative study on dual-magnetic circuit beads and scattering nephelometry coagulometers in coagulational evaluation of blood-contact medical devices.

Tun YUAN ; Jie LIANG ; Jing SAN ; Li-Ping ZHENG ; Wei-Jing ZHU

Chinese Journal of Medical Instrumentation.2008;32(1):54-57.

Dual-magnetic circuit beads and scattering nephelometry dual channel semiautomatic coagulometers are used for the coagulational evaluation of the 5 blood contact medical devices which consist of metals and polymers. The partial thromboplastin time(PTT) and prothrombin time(PT) tests are made based on the GB/T 16886.4-2003 standard. The results indicate that the coefficient of variation in the two groups is in the identical order of magnitude. In the PTT tests, they give the similar evaluational results. With the smaller numerical values of the PT tests, the different coagulometers give the high consilience results. So, both of dual-magnetic circuit beads and scattering nephelometry coagulometers are acceptable in the medical devices' coagulational evaluations. But the interpretation and analysis of the results of the small numerical value tests, PT tests for example, should be noticed.
Blood Coagulation Tests ; instrumentation ; methods ; Magnetics ; instrumentation ; Nephelometry and Turbidimetry ; instrumentation

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Determination of the cations concentrations in the dialysis fluid by an atom absorption spectrometer.

Bo FAN ; Yuan LI ; Xi JIANG ; Chun-Bao MA ; Rui-zhi FU ; Peng ZHANG

Chinese Journal of Medical Instrumentation.2008;32(1):50-53.

The atom absorption spectrometer is introduced to determine the cation concentrations such as potassium, sodium, calcium and magnesium in the dialysis fluid. They are accurately determined by proper preparation and correct dilution ratio under the optimized measuring conditions. Compared with the current arbitrate methods (EDTA titration determination of calcium and magnesium), it supplements the methods of international and industrial standards for determination of cations.
Calcium ; analysis ; Cations ; analysis ; Dialysis Solutions ; analysis ; chemistry ; Magnesium ; analysis ; Potassium ; analysis ; Sodium ; analysis ; Spectrophotometry, Atomic ; methods

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