Jeon Hyesu, Yoo Wook Jae, Shin Sang Hun, Kwon Guwon, Kim Mingeon, Kim Hye Jin, Song Young Beom, Jang Kyoung Won, Youn Won Sik, Lee Bongsoo
School of Biomedical Engineering, College of Biomedical & Health Science, BK21 Plus Research Institute of Biomedical Engineering, Konkuk University, 268 Chungwon-daero, Chungju-si, Chungcheongbuk-do, 380-701, Korea.
Research & Development Center, JPI Healthcare, Osongsaengmyeong 1-ro, Osong-eup, Cheongwon-gun, Chungcheongbuk-do, 363-951, Korea.
Sensors (Basel). 2015 Nov 11;15(11):28490-501. doi: 10.3390/s151128490.
We developed a multichannel all-in-one phantom dosimeter system composed of nine sensing probes, a chest phantom, an image intensifier, and a complementary metal-oxide semiconductor (CMOS) image sensor to measure the dose distribution of an X-ray beam used in radiation diagnosis. Nine sensing probes of the phantom dosimeter were fabricated identically by connecting a plastic scintillating fiber (PSF) to a plastic optical fiber (POF). To measure the planar dose distribution on a chest phantom according to exposure parameters used in clinical practice, we divided the top of the chest phantom into nine equal parts virtually and then installed the nine sensing probes at each center of the nine equal parts on the top of the chest phantom as measuring points. Each scintillation signal generated in the nine sensing probes was transmitted through the POFs and then intensified by the image intensifier because the scintillation signal normally has a very low light intensity. Real-time scintillation images (RSIs) containing the intensified scintillation signals were taken by the CMOS image sensor with a single lens optical system and displayed through a software program. Under variation of the exposure parameters, we measured RSIs containing dose information using the multichannel all-in-one phantom dosimeter and compared the results with the absorbed doses obtained by using a semiconductor dosimeter (SCD). From the experimental results of this study, the light intensities of nine regions of interest (ROI) in the RSI measured by the phantom dosimeter were similar to the dose distribution obtained using the SCD. In conclusion, we demonstrated that the planar dose distribution including the entrance surface dose (ESD) can be easily measured by using the proposed phantom dosimeter system.
我们开发了一种多通道一体化体模剂量计系统，该系统由九个传感探头、一个胸部体模、一个影像增强器和一个互补金属氧化物半导体（CMOS）图像传感器组成，用于测量放射诊断中使用的X射线束的剂量分布。体模剂量计的九个传感探头通过将塑料闪烁光纤（PSF）连接到塑料光纤（POF）以相同方式制造。为了根据临床实践中使用的曝光参数测量胸部体模上的平面剂量分布，我们虚拟地将胸部体模的顶部划分为九个相等部分，然后将九个传感探头安装在胸部体模顶部九个相等部分的每个中心处作为测量点。九个传感探头中产生的每个闪烁信号通过POF传输，然后由影像增强器增强，因为闪烁信号通常具有非常低的光强度。包含增强闪烁信号的实时闪烁图像（RSI）由CMOS图像传感器通过单镜头光学系统拍摄，并通过软件程序显示。在曝光参数变化的情况下，我们使用多通道一体化体模剂量计测量包含剂量信息的RSI，并将结果与使用半导体剂量计（SCD）获得的吸收剂量进行比较。从本研究的实验结果来看，体模剂量计测量的RSI中九个感兴趣区域（ROI）的光强度与使用SCD获得的剂量分布相似。总之，我们证明了使用所提出的体模剂量计系统可以轻松测量包括入射表面剂量（ESD）在内的平面剂量分布。
