Product development of a condenser dosimeter using a skin-insulated USB-A-substrate with a silicon X-ray diode
Product development of a condenser dosimeter using a skin-insulated USB-A-substrate with a silicon X-ray diode
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使用带有硅 X 射线二极管的皮肤绝缘 USB-A 基板的电容式剂量计的产品开发
DOI：
10.1007/s12194-018-00493-4
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发表时间：
2019
影响因子：
1.6
通讯作者：
Eiichi Sato
中科院分区：
文献类型：
--
作者：
Satoshi Yamaguchi;Eiichi Sato
为了测量图像引导放射治疗中的积分剂量，我们开发了一种积分电容剂量计，包括一个带有0.1µF电容和硅x射线二极管（Si-XD）的一次性USB-A微型衬底，一个微型计算机（mbed）基座和一台个人计算机（PC）。Si-XD是一种高灵敏度光电二极管，用于检测x射线。将尺寸为24 × 14 mm2的USB-A基板插入微机底座，通过10-kΩ电阻器将电容器充电至3.23 V。随后使用mbed中的模数转换器（ADC）直接测量电容器充电电压。当电容器充满电时，将微型计算机基座切换到高阻抗，取出衬底。随后，衬底暴露于x射线源，电容器通过流过Si-XD的光电流放电。将基板再次插入底座，测量充电电压。基座通过迷你usb连接线连接到PC上，PC显示器上显示整体剂量。剂量与充电电压的降低成正比，校准的剂量与使用典型的可用电离室获得的剂量相对应。
To measure integral doses in image-guided radiation therapy, we developed an integral condenser dosimeter comprising a disposable USB-A mini-substrate with a 0.1-µF condenser and a silicon X-ray diode (Si-XD), a microcomputer (mbed) dock, and a personal computer (PC). The Si-XD is a high-sensitivity photodiode selected for detecting X-rays. The USB-A substrate with dimensions of 24 × 14 mm2is inserted into the microcomputer dock, and the condenser is charged to 3.23 V through a 10-kΩ resistor. The condenser charging voltage is subsequently measured directly using an analog–digital converter (ADC) in mbed. When the condenser is fully charged, the microcomputer dock is switched to high impedance, and the substrate is removed. Subsequently, the substrate is exposed to an X-ray source, and the condenser is discharged via the photocurrent flowing through the Si-XD. The substrate is inserted into the dock again, and the charging voltage is measured. The dock is connected to a PC through a mini-USB cable, and integral doses are shown on the PC monitor. The doses were proportional to decreases in the charging voltage, and the calibrated doses corresponded well to those obtained using a typically available ionization chamber.