Estimation of Entrance Skin Dose from Fluoroscopy for Tracking Fiducial Markers during Real-time Tumor-tracking Radiotherapy-Simulation with a Sine Wave Respiration Model-

Kawakubo Masateru, Yasui Kenichiro, Kanzaki Ryuji, Oishi Yona, Sanada Taizo

doi:10.6009/jjrt.65.456

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Other Title

動体追跡照射における体内マーカ追跡用透視Ｘ線による皮膚入射線量の推定‐正弦波呼吸モデルによるシミュレーション‐
臨床技術動体追跡照射における体内マーカ追跡用透視X線による皮膚入射線量の推定--正弦波呼吸モデルによるシミュレーション
リンショウギジュツドウタイツイセキショウシャニオケルタイナイマーカツイセキヨウトウシ Xセンニヨルヒフニュウシャセンリョウノスイテイセイゲンハコキュウモデルニヨルシミュレーション

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Description

The real-time tumor-tracking radiotherapy system includes two sets of fluoroscopes that detect the fiducial markers in or near the tumor constantly during radiotherapy. The treatment beam is irradiated to the tumor only when fiducial markers are located in the target position. Treatment time is extended in case of large respiratory tumor motion. A high-power fluoroscopic X-ray is required in the case of fiducial markers in parenchymal organs with heavy X-ray attenuation. It was a concern that radiodermatitis was caused by an increasing entrance skin dose from the fluoroscopic X-ray. In order to estimate the entrance skin dose from the fluoroscopic X-ray, we measured the entrance skin dose rate through the use of a method recommended by the Japanese Society of Radiological Technology. We applied sine wave simulation to resemble the respiratory motion of the tumor. In conclusion, we confirm that entrance skin dose from fluoroscopy during RTRT is lower than the threshold dose for radiodermatitis.

Journal

Japanese Journal of Radiological Technology

Japanese Journal of Radiological Technology 65 (4), 456-461, 2009

Japanese Society of Radiological Technology

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