中山醫大新設立多元智能刀裝機運轉之環境劑量

新的Radixact設施由ACCURAY開發。它具有一個具有360°旋轉功能的線性加速器，用於TomoDirect或TomoHelical，並結合獨特的二元多葉準直儀，以確保劑量有效地應用於腫瘤目標區域，並將對其他重要器官的輻射降至最低。Radixact系統還提供快速獲取高品質電腦斷層影像的功能，提高了定位精度。新的Radixact線性加速器於2023年4月21日至6月8日安裝，總共49天。共進行了38例模擬治療，其中大部分使用TomoHelical進行，安裝期間進行了35例。在安裝期間，使用敏感且準確的熱發光劑量計（TLD）方法對設施進行了環境輻射劑量。治療室內的最高環境劑量為465±72 cGy，位於距離加速器頭60 cm處，最低點位於滑動門旁，為5.51±2.22 cGy。治療室內的輻射劑量差異顯著，且隨著距離加速器頭的增加而減少。此外，還有評估半值層和TLD的最小可測劑量。這些結果與已發表的文獻進行了比較。除治療室外，未檢測到顯著的環境加馬輻射貢獻。

The new Radixact facility, developed by ACCURAY. It features a linear gas pedal with 360° rotation for TomoDirect or TomoHelical, and combines unique Binary Multi leaf Collimator to ensure those doses are effectively applied to the tumor target area and to minimize extra radiations to other critical organs. The Radixact system also provides fast access to high-quality CT images, improved positional accuracy.The NEW Radixact linac was installed from April 21 to June 8, 2023 for a total of 49 days. A total of 38 cases were performed, most of which were treated with TomoHelical, with 35 cases during installation.Radiation doses survey of the facility were employed using the sensitive and accurate thermoluminescent dosimeter (TLD) method during installation. The highest environmental dose in the treatment room was 465 ± 72 cGy at 60 cm above the Gantry head, and the lowest point was 5.51 ± 2.22 cGy next to the sliding door. The radiation doses varied significantly among treatment room and decreased as the distance from the gantry head increased. The half value layer (HVL) and minimum detectable dose of TLD were also determined. These results were compared with published. No significant contributions of environmental gamma radiations were detected except in the treatment room.