查詢結果分析
相關文獻
- 放射治療錐狀射束電腦斷層之輻射劑量--影像品質權衡評估
- 經由減少錐狀射束電腦斷層掃描之旋轉弧度來檢測上顎第一臼齒的第二近心頰側根管
- 頭部電腦斷層掃描劑量評估
- 探討兒童心臟電腦斷層攝影掃描程序對輻射劑量與影像品質之影響
- 三維自適應統計疊代重建法用於腹部骨盆電腦斷層輻射劑量與影像品質評估
- 不同轉換因子k-factor於小兒心臟電腦斷層之輻射劑量評估
- 64切與128切低劑量多切面電腦斷層胸部結節檢查之差異性
- 256切小兒假體心臟電腦斷層之影像品質及輻射劑量評估
- 64及256切小兒心臟電腦斷層於不同造影模式之影像品質與輻射劑量的探討
- 冠狀動脈電腦斷層檢查使用自動曝光系統在320列電腦斷層儀輻射劑量及影像品質的評估
頁籤選單縮合
題名 | 放射治療錐狀射束電腦斷層之輻射劑量--影像品質權衡評估=Trade-off Evaluation between Radiation Dose and Image Quality of Cone-beam Computed Tomography in Radiotherapy |
---|---|
作者 | 張智深; 許筑翔; 陳妙芬; 陳文政; 何志偉; 賴家玄; 陳信雄; | 書刊名 | 中華放射線技術學雜誌 |
卷期 | 40:3 2016.09[民105.09] |
頁次 | 頁140-146 |
分類號 | 416.36 |
關鍵詞 | 錐狀射束電腦斷層; 輻射劑量; 影像品質; 權衡評估; Cone beam computed tomography; Radiation dose; Image quality; Trade-off evaluation; |
語文 | 中文(Chinese) |
中文摘要 | 錐狀射束電腦斷層(cone beam computed tomography, CBCT)已被廣泛的應用於臨床醫療之上,以提供病患高精確的放射治療,然而,每次治療前的定位CBCT 掃描將為病患帶來不可忽視的輻射風險,因此,本研究進行CBCT 輻射劑量-影像品質權衡評估以幫助減少病人之輻射劑量並維持影像品質。本研究使用擬人假體搭配底片,量測CBCT 在不同參數設定掃描下於肺中及體表之輻射劑量,並於掃描產生之影像評估其品質,最後結合劑量與影像品質之結果計算品質參考因子(quality reference factor)。結果顯示,減半管電流條件最能有效減少輻射劑量,相較於標準掃描條件,左、右肺分別可減少55.9%及58.4%的劑量,而使用外加濾器則可同時減少輻射劑量並改善影像中的條狀假影(streak artifacts),此外,適當使用縮限視野(field of view)可避免重要器官直接受到照射,進而降低其輻射劑量;而在影像品質上,減半管電流條件、使用外加濾器條件在肺臟區域中的SNR 相較於標準條件分別減少5.7%與0.9%。我們認為,適當的調整掃描參數將可有效的降低病患於CBCT 掃描中所接受的輻射風險並保持影像之品質。 |
英文摘要 | Cone beam computed tomography (CBCT) has been widely applied in clinical radiation therapy to improve the accuracy of dose irradiation. However, the pre-treatment CBCT scan yields significant radiation risk to patients. In this study, the trade-off evaluation between radiation dose and quality of CBCT image was performed to reduce dose to patient as well as maintain the image quality. An anthropomorphic phantom coupled with Gafchromic films was used to measure the lung and skin dose from CBCT scans with different parameter sets. The simultaneously acquired CT images were employed to evaluate the image quality. At last, a quality reference factor was calculated by combining the results of dose measurement and image quality evaluation. The results showed that halving tube current can significantly reduce radiation dose. Comparing to the standard scanning parameter set, the doses to left and right lung can be reduced by 55.9% and 58.4%, respectively. By using an additional filter to remove low energy photons, the radiation dose can be lowered and the streak artifacts can be reduced. In addition, limited field of view (FOV) can avoid the exposure to critical organs, thereby minimized the absorbed dose. Comparing to the standard scanning parameters, CT scans using the halve tube current and additional filter slightly reduced the SNR in lung regions by 5.7% and 0.9%, respectively. In conclusion, we thought that properly adjusting the scanning parameter could usefully reduce the radiation risk to patients during CBCT scans. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。