2026-05-25 東北大学
図1. 手技の配置図の一例 FPD：Flat Panel Detector（平面検出器, X線受像部）
＜関連情報＞
- https://www.tohoku.ac.jp/japanese/2026/05/press20260525-02-lens.html
- https://www.sciencedirect.com/science/article/pii/S0969806X26004305
インターベンショナルラジオロジーにおける術者の眼レンズへの放射線被曝量のリアルタイム評価：防護シールドの位置とX線ビーム角度の影響 Real-time evaluation of operator eye lens radiation dose in interventional radiology: Effects of protective shield position and X-ray beam angle
Kodai Sagehashi, Masaki Fujisawa, Yoshihiro Haga, Toshiki Kato, Saki Takahira, Masahiro Sota, Yuji Kaga, Takeshi Arai, Norio Tada, Koichi Chida
Radiation Physics and Chemistry Available online: 7 May 2026
DOI:https://doi.org/10.1016/j.radphyschem.2026.114020
Highlights
- Real-time lens dose measured during biplane cardiovascular interventions.
- Horizontal shield displacement strongly affects physician dose rate.
- Posterior shield position significantly increases lens exposure.
- Vertical displacement shows limited impact within typical use range.
- Image-based analysis enables practical optimization of shield positioning.
Abstract
This study investigated the relationship between physician eye-lens dose rate and the positioning of a ceiling-suspended protective shield during cardiovascular interventions using a biplane imaging system. A real-time dosimeter measured dose rate near the operator’s eye at 1-s intervals, and procedural videos were analyzed to evaluate the geometric relationship between the physician’s head and the protective shield. Dose rate differed significantly by beam angulation (p < 0.001), with higher values observed in caudal (CAU) projections. Horizontal displacement of the protective shield showed a strong negative correlation with dose rate during fluoroscopy (R = −0.656 to −0.829, p < 0.01) and cine acquisition (R = −0.538, p < 0.01). When the shield was positioned posterior to the physician’s head, the dose rate increased significantly, with large effect sizes. In contrast, vertical displacement showed weak or no correlation with dose rate, with low explanatory power, indicating a limited effect on lens exposure within the typical range of shield use. These findings suggest that horizontal misalignment of the protective shield, influenced by beam angle changes and operator posture, is a key determinant of physician exposure. Ensuring appropriate anterior positioning of the shield, particularly during CAU projections and after angle changes, may help reduce occupational lens dose. The combined use of real-time dosimetry and image-based positional analysis provides a practical approach for optimizing radiation protection during interventional procedures.
