Medical air system is widely used in hospitals. Parameters such as terminal pressure, terminal pressure drop, terminal flow, water content, and particle concentration can directly decide the quality of medical air system. At present, there is no relevant calibration specification,or method for medical air system in China. This article presents a novel calibration method for medical air system by determining corresponding environmental conditions, calibration standards, location of standards and calculation equations. The calibration results show that the calibration method is scientific and practical for metrological performance evaluation of medical air system.
This article studies the key technical parameters such as “short wavelength boundary,” “energy density,” “energy output uniformity,” and “pulse duration” of xenon light source equipment for therapeutic use, determines the measurement standard, and presents an applicable metrological performance evaluation method for the equipment. The evaluation procedure presented in this article has been performed on several typical types of xenon light source equipment for therapeutic use widely used in China, and the experimental results show that the evaluation method presented in this article is scientific and effective, and can be adopted for the periodic calibration of the equipment, in order to establish the metrological traceability system of the equipment.
Infant phototherapy incubator is widely used in medical institutions to reduce the concentration of bilirubin in the body of infant while maintaining the body temperature of the infant. This article presents a novel design of calibration procedure to measure the instruments’ metrological parameters such as "error of total irradiance for bilirubin after pre-ageing", "relative local distribution of total irradiance for bilirubin after pre-ageing", "uniformity of incubator temperature", "accuracy of skin temperature sensor", "relative humidity indication error" and "accuracy of oxygen sensor" in order to ensure the accuracy and reliability of infant phototherapy incubator. The experimental results show that the calibration procedure presented in this article can ensure the metrological traceability of infant phototherapy incubators in daily use.
This article presents a novel design of reference optical simulator and physical calibration method for optical performance evaluation of real-time fluorescent quantitative PCR analyzer in order to substitute for traditional chemical method. The optical simulator is designed according to the working principle, and technical characteristics such as fluorescence peak height consistency among channels, linear sensitivity factor, fluorescence intensity repeatability, and linear correlation coefficient of fluorescence of real-time fluorescent quantitative PCR analyzer.The calibration results of 5 typical types of real-time fluorescent quantitative PCR analyzers show that the reference optical simulator presented in this article can well simulate different fluorescent dyes. The reference optical simulator can meet the requirements of fluorescent intensity calibration for real-time fluorescent quantitative PCR analyzers with the advantages of good applicability, high convenience and accurate and reliable measurement results.
This article presents a novel design of reference light source and physical calibration method for optical performance evaluation of micro-plate chemiluminescence analyzers in order to substitute for traditional biological and biochemical methods. The reference light source is designed according to the working principle, and technical characteristics such as repeatability, stability, interference among wells, differences among channels and linearity of micro-plate chemiluminescence analyzers. The calibration results of 4 typical types of micro-plate chemiluminescence analyzers show that the reference light source and physical calibration method presented in this article can well simulate different chemiluminescence reagents and meet the requirements of luminous intensity calibration for chemiluminescence analyzers with the advantages of simple structure, good applicability, low cost and accurate and reliable measurement results.
Ophthalmic ultrasonic B-mode diagnostic device is widely used in medical institutions. “penetration depth”, “resolution”, “dead zone” and “geometric position accuracy” are the key technical parameters to evaluate the metrological performance of the device. However, until now no national or local metrological specifications applicable to ophthalmic ultrasonic B-mode diagnostic device has been issued in China, and the corresponding traceability system of the device has not been established either. The novel calibration procedure presented in this article has been performed on several typical types of ophthalmic ultrasonic B-mode diagnostic devices widely used in China, and the experimental results show that the calibration method presented in this article can be adopted for the periodic calibration of ophthalmic ultrasonic B-mode diagnostic device, in order to establish the metrological traceability system of the device.
3D ultrasonic diagnostic equipment is widely used in medical institutions. “volume reconstruction” and “slice thickness” are the key technical parameters to evaluate the metrological performance of the equipment. However, until now no national or local metrological specifications applicable to 3D ultrasonic diagnostic equipment have been issued in China, and the corresponding traceability system of the equipment has not been established either. The novel calibration procedure presented in this article has been performed on several typical types of 3D ultrasonic diagnostic equipment widely used in China. The experimental results show that the calibration method presented in this article can be adopted for the periodic calibration of 3D ultrasonic diagnostic equipment, in order to establish the metrological traceability system of the equipment.
Radio frequency ablation instrument is a kind of surgical equipment widely used in medical institutions, and output power is one of the most important technical parameters of this instrument. However, until now, there is no corresponding verification regulation or calibration specification for the validation of metrological traceability and performance reliability of such instruments. By analyzing the measurement principle of quality analyzer for electrosurgical generator and the output power range of radio frequency ablation instrument, this article presents a solution, which is to test the output power of radio frequency ablation instrument according to JJF 1217-2009 Calibration Specification for Electrosurgical Generator, and the feasibility of the design is evaluated as well bycomparing the test results with the data acquired by following measurement procedure recommended by industry standards to confirm the feasibility of the novel design.
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