医用核素活度计的设计与改进  

Design and improvement of medical radioisotope dose calibrator

作　　者：单健[1] 赵修良[1] 唐岳湘[1] 

机构地区：[1]南华大学核科学技术学院,衡阳421001

出　　处：《国际生物医学工程杂志》2009年第2期88-91,共4页International Journal of Biomedical Engineering

基　　金：南华大学校级重点项目（06207）

摘　　要：目的对基于LabVIEW的医用放射性核素活度计的系统设计方案进行了硬件部分的改进。方法应用性能优良的电压／频率转换芯片VFC32实现了硬件电路设计和性能分析。利用设计的电路对医用放射性核素活度计电离室输出的电压进行信号处理，得到的频率信号通过NI公司的USB-6009 DAQ和LabVIEW8．0开发的虚拟仪器实现进一步的处理和显示。结果实验数据的图形表明改进后的系统在中低频段具有更好的线性度。结论改进后的活度计更有利于改善医用放射性核素活度计的测量精度、测量范围、低能探测限等性能。Objective To improve the hardware of a medical radioisotope dose calibration system base on LabVIEW platform. Methods High performance voltage-frequency-converter VFC32 was applied to realize hardware circuit design of medical radioisotope dose calibrator, and the function of the circuit was analyzed. The output voltage signal from the calibrator ionization chamber was processed by the designed circuit. The output frequency signal from the circuit was obtained by USB-6009 DAQ and was then processed by virtual instrument designed using LabVIEW 8.0. Results Experimental data graphs indicated that the improved system had a better linearity in the low and medium frequency band. Condusion The redesigned radioisotope dose calibrator has advantages in improving measuring accuracy, measuring range, feeble-minded detection limit and so on.

关 键 词：医用核素活度计 电压/频率转换器 虚拟仪器 

分 类 号：TH774[机械工程—仪器科学与技术]