體表監測輔助系統用於以發泡劑為固定設備之左側乳癌病患定位效果評估

Accuracy Evaluation of Left Breast Cancer Patients were Treated in Using of Surface Guided Radiotherapy

何迦聖(Chia-Sheng Ho) ； 張智深(Chih-Sheng Chang) ； 陳妙芬(Miao-Fen Chen)

《中華放射線技術學雜誌》 45卷1期 (2021/03) Pp. 1-8

摘要

本研究的目的在了解左側乳癌病患全乳放射線治療，以Surface Guided Radiotherapy（SGRT）體表監測設備AlignRT®協助臨床放射師擺位，相較於過往未使用體表監測設備輔助下之擺位準確性。本次研究選取58位未以體表監測設備輔助之左側乳癌病患及32位以AlignRT®體表監測設備輔助擺位之左側乳癌病患的錐狀射束電腦斷層Cone Beam Computed Tomography（CBCT）數值，比對兩者分別在R/L、S/I及A/P方向的誤差。比對結果顯示在體表監測設備AlignRT®的輔助之下，R/L、S/I及A/P方向所需的邊緣餘量（margin）為0.34cm、0.46cm、0.54cm，相較於以往未使用體表監測設備輔助下，R/L、S/I及A/P的邊緣餘量（margin）1.21cm、1.07cm、0.9cm，在體表監測設備的使用下，可提升左側乳癌病患擺位的準確性。特別是對於體態肥胖的病人，因著AlignRT®的使用，空間向量變動量為同體態未使用監測設備變動量的39.5%，擺位準確度提升效果最為明顯。整體而言，使用AlignRT®協助臨床擺位工作可以降低擺位的誤差，提升治療的準確性。

關鍵字

擺位誤差 ； 乳癌 ； SGRT ； setup margin

並列摘要

The aim of the present study is to investigate whether surface guided radiotherapy (SGRT) with alignRT help improve setup accuracy for breast cancer patients underwent adjuvant RT. A total 90 left-sided breast cancer patients, who received image guide radiotherapy with cone-beam CT (IGRT) for isocenter corrections, were enrolled in the study. Among these patients, 32 patients used AlignRT for the patients setup prior to IGRT (SGRT group), and the other 58 patients only used MV‐based cone-beam CT for isocenter correction (IGRT group). Inter‐fractional position errors were analyzed retrospectively. The setup error for patients in SGRT group in the right-left (R/L), superior-inferior (S/I) and anterior-posterior (A/P) are 0.34cm, 0.46cm and 0.54 cm, respectively, as compared to 1.21cm, 1.07cm and 0.54cmin the IGRT group. The data revealed that SGRT with alignRT further improved setup accuracy for breast cancer patients receiving IGRT. Especially for the obese patients, the addition of alignRT decreased the total setup error by 39.5%. In conclusion, the use of alignRT could bring additional benefit in setup accuracy for breast cancer patients underwent IGRT.

並列關鍵字

Setup Accuracy ； Breast Cancer ； SGRT ； setup margin