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題名 | 電腦斷層模擬攝影機影像解析度及雜訊的量測=Computed Tomography Simulation Image Quality and Noise Measurement |
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作 者 | 趙敏; 趙良曉; 劉雪君; 李玉麟; 顏上惠; 陳光耀; | 書刊名 | 放射治療與腫瘤學 |
卷期 | 5:3 1998.09[民87.09] |
頁次 | 頁187-191 |
分類號 | 416.14 |
關鍵詞 | 電腦斷層模擬攝影機; 空間解析度; 對比解析度; 雜訊程度; Computed tomography simulation; Spatial resolution; Contrast resolution; Noise; |
語文 | 中文(Chinese) |
中文摘要 | 目的:為確保電腦斷層模擬攝影機影像的空間解析度,對比解析度及雜訊程度,以 達到精確放射治療的標準。 材料與方法:使用Elscint HeliCAT II電腦斷層模擬攝影機、標準頭部及身體假體來做電腦 斷層影像解析度及雜訊的量測。空間解析度使用標準頭部假體多層針狀層中七列不同半徑的 橫排孔洞,及經過機器掃描後得出的影像參數與標準值作比較。對比解析度使用頭部假體多 層針狀層中五個不同材質量測電腦斷層掃描值與準標值作比較。雜訊乃是使用頭部及身體假 體,利用電腦斷層掃描儀上的功能鍵測出標準偏差,經過運算得到之值,是否落於標準範圍 內。 結果:空間解析度的誤差在0.8 mm以內,對比解析度誤差除鐵氟龍以外CT誤差值在18以內, 而雜訊的量測經過計算所得之CT值在3%以內。 結論:根據量測所得數據,顯示此部電腦斷層掃描儀的空間解析度、對比解析度及雜訊在標準 值之內並合於精準放射治療之用。若要保證此部機器的品質需要定期的測試與校正。 |
英文摘要 | Purpose: To measure and evaluate the spatial resolution, contrast resolution and noise of computed tomography simulation image in order to meet the requirement of precision radiation therapy. Materials and methods: Elscint HeliCAT II CT scanner head and body phantom were used to measure and evaluate the image quality of computed tomography simulator. We used the head phantom includes seven rows of different diameter perspex layer (multipin layer) to do the spatial resolution comparisons, and another five different material layer of this head phantom were also used to do the contrast resolution comparisons. The noise was used the head and body phantom through the "ROI" function key to find its percentage errors in order to meet the requirement of precision radiation therapy. Results: The error of spatial resolution was within ± 0.8 mm. The Contrast resolution error was within ± 18 CT number except Teflon. The range of noise was within 3%. Conclusions: The quality assurance procedure of this computed tomography simulation imaging system had been setup before formally using. It all met the requirement of precision radiation therapy. To assure the image quality, it also needs measurement periodically. |
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