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頁籤選單縮合
題名 | 使用ArcCHECK評估碳纖維治療床對高能光子射束衰減的影響=The Evaluation of the MV Photon Beam Attenuated by a Carbon Fiber Couch through the ArcCHECK |
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作 者 | 康誠麟; 蔡正祥; 王瑞祝; 許順能; 張力允; 藍仁鴻; 廖宗義; 阮國榮; | 書刊名 | 中華放射線技術學雜誌 |
卷期 | 39:4 2015.12[民104.12] |
頁次 | 頁203-208 |
分類號 | 416.36 |
關鍵詞 | 強度調控放射治療; 治療計劃系統; 治療床模版; Intensity-modulated radiation therapy; Treatment planning system; Couch model; |
語文 | 中文(Chinese) |
中文摘要 | 本研究的目的是利用一種二極體劑量計ArcCHECK,並評估它在強度調控放射治療(intensity-modulated radiation therapy, IMRT)中的品質保證(quality assurance, QA)的使用結果。本研究主要分成二部份:第一部份為利用經校正後的游離腔(ion chamber)來測量治療床所造成劑量的衰減,並且找出其與測量角度、能量及照野大小之間的依存性。同時依照實際治療床的尺寸及密度,在Pinnacle3治療計畫系統(treatment planning system, TPS)中建立一臨床碳纖維治療床模版(couch model),並將實際測量結果和治療計畫系統(使用創建的治療床模版)計算結果進行比較分析。本研究目標希望能探討兩者的差異性(驗證治療床模版劑量修正的準確性)。第二部份將驗證後的碳纖維治療床的模版導入臨床患者治療計畫,重新再行運算,並將該計畫再運算結果複製到ArcCHECK中。複製至ArcCHECK時,完全依照治療計畫計算時的所有射束照野及採用實際治療角度位置來執行照射及測量,再將劑量測量值與計算值相互比較。最後分析治療計畫有無治療床模版在IMRTQA的量測結果。第一階段使用所設計的治療床模版驗證臨床劑量,發現在能量6 MV時不同射束角度造成衰減的差異性在-2.6%~1.9%。而能量10 MV則在-0.2%~2.5%。兩者的差異性均在±3%以內。電腦治療計劃在沒有治療床模版條件修正下,通過率測試結果(Γ值≤1)在92.6%〜 97.1%間。而在有加入治療床模版條件下,通過率測試結果(Γ值≤1)在93.9%〜98.2%間。再以配對t檢驗(paired t-test)對通過率結果進行統計分析,發現二者在統計學上具有顯著差異(p< 0.05)。顯示出有加入治療床模版條件下能有較佳及較能符合實際劑量的驗證結果。在本研究中已經將治療床模版成功加入TPS並加以驗證。總體而言,我們建議治療射束若有後斜位的方向時,必須要在治療計劃將治療床模版計算。另外,由我們比較的測量結果顯示ArcCHECK,可以適用於臨床IMRT QA的驗證。 |
英文摘要 | The goal of this study was to evaluate the ArcCHECK device with a diode detector and use it in the routine quality assurance (QA) of intensity-modulated radiation therapy (IMRT). This study includes two steps. First, we measured the couch attenuation with an ion chamber with different setups of gantry angle, energy and field size. At the same time we established a couch model into Pinnacle3treatment planning system (TPS) according to the size and density of the actual treatment couch. After that, the measured dose and treatment planning calculated dose (including couch model) were compared and analyzed. Second, the validated couch model was introduced into the TPS and all the plans were recalculated. Then all the setups of the recalculated plan were introduced into a phantom for the IMRT QA which was performed by a new device. The ArcCHECK measured dose and the planned dose were also compared. The IMRT QA results between with couch model and without couch model in TPS were analyzed. Then the paired t-test between the gamma passing rates with or without couch model built in the TPS was also performed. For the validation of couch model in TPS, the attenuation differences are between -2.6% and 1.9% for 6 MV photon beam. For 10 MV photon beam, the differences are between -0.2% and 2.5%. All differences were within 3%. The results of the second step demonstrated that the gamma passing rates were located between 92.6% and 97.1% without couch model built in the TPS. The gamma passing rate is higher and located between 93.9% and 98.2% when the couch model was built in the TPS. That the p-value of the t-test is less than 0.05 standing for statistically significant shows that the couch model built in the TPS does have better results. In summary, the couch model included in the treatment planning is recommended for all treatments, and the ArcCHECK is demonstrated to be suitable for clinical QA verification of IMRT. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。