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頁籤選單縮合
題名 | 評估電腦斷層影像中人工髖關節造成的金屬假影在治療劑量計算的影響=The Dosimetric Impact from Metal Artifact of Hip Prosthesis on CT Images |
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作者 | 黃安潔; 林煒柔; 胡志忠; 黃國明; 吳簡坤; 成佳憲; Huang, An-jie; Lin, Wei-jou; Hu, Chih-chung; Huang, Guo-ming; Wu, Jian-kuen; Cheng, Chia-hsien; |
期刊 | 臺灣應用輻射與同位素雜誌 |
出版日期 | 20110900 |
卷期 | 7:3 2011.09[民100.09] |
頁次 | 頁129-136 |
分類號 | 416.36 |
語文 | chi |
關鍵詞 | 人工髖關節; 金屬假影; 仟伏特電腦斷層影像; 百萬伏特電腦斷層影像; Hip prosthesis; Metal artifact; kVCT; MVCT; |
中文摘要 | 隨著人口老化,接受人工髖關節置換術的患者比例升高;攝護腺癌病人在接受放射治療時,金屬人工髖關節於治療計劃仟伏特電腦斷層kVCT影像(kilo-Voltage Computed Tomography Images)上造成假影,使其周圍之軟組織影像模糊,且假影可能造成劑量計算產生潛在性的誤差。本實驗利用人工髖關節常用的鈦金屬為植入物,置入實驗假體cheese phantom中以模擬經施行人工髖關節置換之骨盆腔放射治療的病患,取得電腦斷層掃描機的kVCT影像和螺旋刀治療機的百萬伏特電腦斷層MVCT影像(Mega-Voltage Computed Tomography Images)為兩相對照組,在不同照射能量及角度與金屬植入物大小、數量等不同實驗條件分組下,比較金屬於kVCT及MVCT影像中造成治療計劃劑量計算之差異。由實驗結果得知,雖金屬植入物越大、數量越多,造成金屬假影愈趨明顯,但劑量計算誤差的原因主要來自於kVCT影像上金屬物質密度之錯估,故在kVCT影像引起劑量計算誤差的情況下,可利用MVCT影像較無金屬假影及合適的金屬密度估計值來輔助劑量計算的修正。 |
英文摘要 | While the population is aging gradually, the proportion of patient receiving the replacement technique with metal prosthesis increases. When these patients have prostate cancer and receive radiotherapy, the implant of hip prosthesis causes the artifact on kVCT (kilo-Voltage Computed Tomography) images for treatment planning calculation. These metal artifacts not only lead to obscure the surrounding soft tissue but also cause potential inaccurate dose calculation. In this study, we used the cheese phantom and metal rods made by titanium to simulate the structure of pelvis with the implant of prosthesis in clinical situation. We used the CT scanner and helical tomotherapy to acquire the kVCT and MCVT (Mega-Voltage Computed Tomography) images, respectively. We compared the dose calculation results on these two different images, and analyzed the difference with different energies, number of rods, size of rods, and beam settings. With these comparisons, we can understand the impact of metal prosthesis on dose calculation in treatment plan. The results showed that the bigger metal rod and the increased number of metal rods caused more obvious metal artifacts on images. However, the misestimate of physical density causes more dose calculation inaccuracy than metal artifact itself on kVCT images. Therefore, we may use the MVCT images without metal artifacts and appropriate estimation of metal density to correct the inaccurate results of dose calculation on kVCT images. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。