Development of Testing and Controlling Circuit for Timing and Exposure Measurement of X-ray Machine
Jian Feng Huang · Chinese Medical Equipment Journal · 2012
Objective To design and produce a testing and controlling electronic circuit for timing and total exposure measurement so as to improve the accuracy of power frequency X-ray machine and to provide an exposure measuring instrument for the maintenance engineers.Methods The capacitor was charged by using the precision op amp as the adjustable constant current source circuit,the voltage across the capacitor was used as timing or total exposure analog, which was sent to the display circuit or control circuit after treatment to complete the timing and total exposure measurement testing and controlling.Results By using the circuit,the error range of X-ray amount produced by X-ray machine was reduced from±(10%~15%) to less than±2%.Conclusion This circuit can easily replace the timing circuitry of the original machine,which increases the total exposure measurement function to the machine,and improves greatly the exposure control accuracy of the original machine.