Takata Takeshi, Kondo Hiroshi, Yamamoto Masayoshi, Shiraishi Kenshiro, Kobayashi Takenori, Furui Shigeru, Okamoto Takahide, Oba Hiroshi, Kotoku Jun'ichi
Graduate School of Medical Care and Technology, Teikyo University, Japan.
Department of Radiology, Teikyo University School of Medicine, Japan.
Interv Radiol (Higashimatsuyama). 2020 May 29;5(2):58-66. doi: 10.22575/interventionalradiology.2019-0007. eCollection 2020 Jun 30.
For interventional radiology (IR), understanding the precise dose distribution is crucial to reduce the risks of radiation dermatitis to patients and staff. Visualization of dose distribution is expected to support radiation safety efforts immensely. This report presents techniques for perceiving the dose distribution using virtual reality (VR) technology and for estimating the air dose distribution accurately using Monte Carlo simulation for VR dose visualization. We adopted an earlier reported Monte-Carlo-based estimation system for IR and simulated the dose in a geometrical area resembling an IR room with fluoroscopic conditions. Users of our VR system experienced a simulated air dose distribution in the IR room while the irradiation angle, irradiation timing, and lead shielding were controlled. The estimated air dose was evaluated through comparison with measurements taken using a radiophotoluminescence glass dosimeter. Our dose estimation results were consistent with dosimeter readings, showing a 13.5% average mutual difference. The estimated air dose was visualized in VR: users could view a virtual IR room and walk around in it. Using our VR system, users experienced dose distribution changes dynamically with C-arm rotation. Qualitative tests were conducted to evaluate the workload and usability of our VR system. The perceived overall workload score (18.00) was lower than the scores reported in the literature for medical tasks (50.60) and computer activities (54.00). This VR visualization is expected to open new horizons for understanding dose distributions intuitively, thereby aiding the avoidance of radiation injury.
对于介入放射学（IR）而言，了解精确的剂量分布对于降低患者和工作人员发生放射性皮炎的风险至关重要。剂量分布的可视化有望极大地支持辐射安全工作。本报告介绍了使用虚拟现实（VR）技术感知剂量分布以及使用蒙特卡罗模拟进行VR剂量可视化以准确估计空气剂量分布的技术。我们采用了先前报道的基于蒙特卡罗的IR估计系统，并在类似于具有荧光透视条件的IR室的几何区域中模拟剂量。我们VR系统的用户在控制照射角度、照射时间和铅屏蔽的同时，体验了IR室中的模拟空气剂量分布。通过与使用放射性光致发光玻璃剂量计进行的测量结果进行比较，对估计的空气剂量进行了评估。我们的剂量估计结果与剂量计读数一致，平均相互差异为13.5%。估计的空气剂量在VR中可视化：用户可以查看虚拟IR室并在其中走动。使用我们的VR系统，用户可以随着C形臂旋转动态体验剂量分布的变化。进行了定性测试以评估我们VR系统的工作量和可用性。感知到的总体工作量得分（18.00）低于文献中报道的医疗任务（50.60）和计算机活动（54.00）的得分。这种VR可视化有望为直观理解剂量分布开辟新的视野，从而有助于避免辐射损伤。
