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題 名 | 氟18試劑的幾何變異度對劑量校正儀活度測量之影響=Effect of Geometric Variation of F-18 Agent on the Radioactivity Determination using a Dose Calibrator |
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作 者 | 楊宛甄; 劉貝珊; 李靖慧; 林俊良; | 書刊名 | 臺灣應用輻射與同位素雜誌 |
卷 期 | 4:4 2008.12[民97.12] |
頁 次 | 頁543-547 |
分類號 | 418.346 |
關鍵詞 | 劑量校正儀; 氟18; 幾何變異; Dose calibrator; Fluorine-18; Geometric variation; |
語 文 | 中文(Chinese) |
中文摘要 | 氟18標誌之去氧葡萄糖是目前臨床上使用最爲廣泛之正子藥物,活度之量測主要是利用劑量校正儀,但樣品本身的體積與盛裝容器不同所造成之幾何變異可能影響活度的量測值。本研究首先準備固定體積的10mCi F-18試劑經自然衰變至低於1mCi,衰變期間每隔數分鐘計算剩餘活度並使用劑量校正儀取得測量值,進行線性測試。然後使用20ml玻璃瓶、5ml及3ml塑膠針筒分別裝填相同體積與活度濃度的F-18試劑,再利用劑量校正儀測量活度的變化。另外,亦將上述容器各加入定量小體積之F-18試劑後並以生理鹽水稀釋成不同體積,再以劑量校正儀測量各稀釋後之試劑活度變化。結果顯示,本研究所使用之劑量校正儀可以準確測量寬範圍活度(<1-10mCi)的18F試劑。定量體積及活度濃度的P-18試劑裝填在20ml玻璃瓶、5ml與3ml塑膠針筒之容器中所測量之平均活度分別爲3.42、3.49與3.47mCi,前者之平均值較低但差異不明顯。在相同材質的容器中發現18F試劑被稀釋後,體積越大所測得之活度平均值較低,其中20ml玻璃瓶、5ml與3ml塑膠針筒裝填小體積試齊至最大稀釋體積所測得的活度差異分別爲0.6%、1.2%及2.2%。劑量校正儀之測量值的確會受到樣品的幾何變異之影響但差異不大,對於一般造影檢查影響有限,但對於定量分析之應用則有必要對各稀釋體積及各材質之容器作進一步校正,並取得各校正因數。 |
英文摘要 | Fluorine-18 FDG is the common positron emitting reagent used in nuclear medicine. The radioactivity of the reagent is obtained by a dose calibrator. But sample in its geometric variation of volume or container may affect the measurement of activity. This research prepared first the fixed volume of 10 mCi F-18 reagent which decreased activity to lower than 1 mCi by nature decay. During this decay, the remnant activity was measured by a dose calibrator every several minutes to perform linearity curves of measurement. Another experiment was individually adding equal volume and activity concentration of F-18 reagents to 20ml glass vials, 5ml and 3ml plastic syringes. Then, the dose calibrator measured every reagent container to observe the variation of measurements. Additionally, we also used above-mentioned containers to load individually small volume of F-18 reagent, then diluted by the normal saline to increase the reagents volume continually. During the dilution continued, every diluted reagent was measured the activity by the dose calibrator. The results showed the dose calibrator had a great behavior of linearity in wide activity (<1-10mCi) measurement on F-18 reagent. Fixed volume and ac1ivity concentration of F-18 reagents added into 20ml glass vials, 5ml and 3ml plastic syringes were obtained individual mean activity of 3.42、3.49 and 3.47mCi. The former's mean value was relatively low but no obvious difference. In the identical containers loaded fixed quantity of F-18 reagent, the more diluted volume the lower activity measured by the dose calibrator. The variation of measurement from small to the highest diluted volume in 20ml glass vials, 5ml and 3ml plastic syringes were 0.6%, l.2% and 2.2% individually. The geometric variation of the sample is indeed influlence on measurement of the dose calibrator. For general imaging studies, the variation effects in the images are fairly low. But for quantitative analysis studies, the every used container and different volume of F-18 reagent must be calibrated and ca1culated correction factors. |
本系統中英文摘要資訊取自各篇刊載內容。