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題名 | 利用硫酸亞鐵劑量膠及快速自旋迴音磁振影像量測輻射吸收劑量=Using Ferrous Sulphate Gel and Fast Spin-Echo MR Images to Measure Radiation Dose Absorption |
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作者 | 吳孟珈; 朱唯勤; 郭萬祐; 鍾文裕; 潘宏基; | 書刊名 | 中華醫學工程學刊 |
卷期 | 18:1 1998.03[民87.03] |
頁次 | 頁29-37 |
分類號 | 410.1644 |
關鍵詞 | 輻射劑量學; 硫酸亞鐵劑量膠; 磁振造影; Radiation dosimetry; Fricke-agarose dosemeter gel; Magnetic resonance imaging; |
語文 | 中文(Chinese) |
中文摘要 | 利用硫酸亞鐵劑量膠以及磁振造影的方法來測量輻射吸收劑量,已被證實可行。 然而,過去的研究均根據輻射照射前後 RI 參數( Proton Spin-lattice Relaxation Rate )的改變來計算,不但需要較長的磁振造影時間與繁雜的影像處理計算程序,在計算時尚且 需要做指數回歸,使得整個劑量偵測程序變得相當冗長且容易產生錯誤。我們從磁振影像訊 號強度的基本公式, 即( Bloch euqations ), 推導出直接以磁振影像的強度值取代 RI 參數的比對標準。經由實驗的驗證,證實可以得到同樣良好的迴歸關係。利用磁振影像訊號 強度來計算輻射吸收劑量簡單易行,除了可大量節省磁振造影的時間之外,並且也免除在計 算 T1 參數時可能產生的誤差。 |
英文摘要 | Early studies have shown that radiation dose absorption can be quantified by calulation the change of RI rate of a ferrous sulphate gel before and after irradiation. However, to do so, it requires a relatively long MR imaging time and complex T1 curve fitting procedures which make it very time consuming and prone to error. In this paper, we show that from the basic MR theory, i.e., Bloch equations, MR image intensity change can be used directly to quantify dose absorption instead of the R1 rate. Since only two images are needed for the calculation, our method requires much less MR scan time and virtually no post-processing time and completely avoids any potential error which may be introduced when performing T1 curve fitting. |
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