ABSTRACT
Objective To improve the hardware of a medical radioisotope dose calibration system base on LabVIEW platform.Methods Hiish performance voltage-frequency-converter VFC32 was applied to realize hardware circuit design of medical radioisotope dose calibrator,and the function of the circuit wag 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.Conclusion The redesigned radioisotope dose calibrator has advantages in improving measuring accuracy,measuring range,feeble-minded detection limit and so on.
ABSTRACT
A computerized fetal ECG(FECG)system is presented,w hi ch is composed of two components.One is the data collection device with a PIC m icrocomputer as the main hardware,which has low power consumption and gets power supply through serial port.The other is a software platform based on PC,which i s built through LabView6.1,a graphic programming language.Plenty of modules prov ided by LabView6.1utilized,it is efficient to develop the software platform.In particular,the implementation of the matched filtering algorithms is introduced ,which is the core of the software platform.A new method of updating templates o f matched filter is described.