光耦功率放大技术在CT超低剂量扫描的研究

Development of Light-coupler Power Amplifier Technique in Low Dose CT Scan

目的将全新的光电耦合高电压强电流放大处理技术用于CT机的前置放大处理中,隔离噪声和高电压大电流放大图像信号,实现超低剂量扫描,高清晰成像。方法将光电耦合放大器制作成射线剂量仪,并用CT机等超低剂量120KV、3-6mA…对其曝光,并与标准射线剂量仪校准,使其输出值不仅为射线剂量值,更能显示为高电压和大电流的优质图像信噪比。结果超小电流扫描经探测和光耦放大后最大值为87.5V和0.96A,而噪声电压为0.13μV、电流仅为0.02μA,给超低剂量扫描和传输处理时的功耗及高电压的宽动态范围显示留了很大空间。结论 CT超低剂量扫描时光耦放大器可在源头彻底隔离各种噪声并超高倍放大、高电压大电流输出图像信号,可保证高清晰高分辨率成像。

objective Photoelectric coupling high voltage strong current amplification process technology in CT machine preamplifier processing applications.Isolate the noise and high voltage large current amplification image signal,realize low dose scanning,high-definition imaging.Methods Using photoelectricity coupling amplifiers make rays dosimeter,and with 120Kv,3-6mA ultra low dose CT machine exposure,and with standard rays dosimeter calibration,make its output value not only for radiation dose value,more can show for high voltage and high current high-quality image SNR.Results By detecting and optical coupling amplification exceed small current scanning maximum is 87.5 V 0.96A,and noise voltage for 0.13 μV,current is only 0.02 μA It gives low dose scanning,transmission in processing power consumption and high voltage wide dynamic range shows that there is a lot of space.Conclusion When conducting a low dose CT scan,because light-coupler to isolate all noises,ultra amplifier amplification times,high voltage large current output image signal,so can ensure high resolution imaging.