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題 名 | 腦部雙能電腦斷層攝影輻射劑量評估=Radiation Doses Evaluation for Brain Examination in Dual Energy Computed Tomography |
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作 者 | 鍾昆賢; 盧玉龍; 張寶樹; 鍾相彬; 李榮輝; 林理涵; 趙世裕; | 書刊名 | 中華放射線技術學雜誌 |
卷 期 | 40:4 2016.12[民105.12] |
頁 次 | 頁199-204 |
分類號 | 414.93 |
關鍵詞 | 雙能電腦斷層; 筆形游離腔; 假體; 輻射劑量; Dual energy CT; Ion chamber; Phantom; Radiation dose; |
語 文 | 中文(Chinese) |
中文摘要 | 本文章旨在探討腦部電腦斷層檢查於雙能電腦斷層攝影(dual energy computed tomography, DECT)的假體劑量評估。利用100公厘筆形游離腔和直徑16公分、高15公分電腦斷層PMMA假體作為測量工具。DECT選擇使用同一能量之兩顆球管,用兩種不同的掃描模式來量測並評估病人進行腦部電腦斷層檢查的輻射劑量。記錄三次連續性量測數據,經公式計算後,可得知病人在Flash與Spiral兩種使用模式下的有效劑量。結果顯示傳統的Spiral mode是2.14±0.01 mSv,掃描時間需要6.58秒;新型掃描模式Flash mode是1.31±0.00 mSv,掃描時間需要1.06秒,相較之下,輻射劑量確實減少了39%。使用SPSS 18.0軟體,以成對樣本T檢定(Paired t test)來進行統計分析,設定p<0.01有顯著性差異。發現模擬成人腦部劑量分析上,在Flash 與Spiral兩種掃描模式下,劑量具顯著性差異(p<0.01)。在影像品質上,以信雜比來評估兩者的掃描模式,顯示無顯著性差異(p>0.01)。因此建議臨床上無法配合檢查的病人,在不影響影像品質下,如需要短時間的檢查又要較低輻射劑量,Flash mode是一種較佳的掃描方式。 |
英文摘要 | This study was mainly to evaluate the phantom radiation dose of dual energy computed tomography (DECT) in brain CT scan. We chose both tubes with the same energy but different scan mode in the CT scanner to simulate the radiation dose absorbed by patient during brain CT using a PMMA phantom. In this study, we used a 100 mm pencil ion chamber, diameter 16 cm × height 15 cm, to measure the radiation doses. Through three times continuous measurements, we examined the equivalent dose absorbed by patient under both Flash and Spiral scan modes, and tested statistical hypothesis by using SPSS 18.0 software and paired t test for statistical analysis. The result showed that Spiral mode was 2.14±0.01 mSv in 6.58 sec compared to Flash mode, 1.31±0.00 mSv in 1.06 sec, Flash mode did reduce the radiation dose by 39% (p>0.01) and defined as significant difference. The results showed that under both Flash and Spiral scan modes, the simulated equivalent dose, absorbed by adult patient in brain CT scan, had a significant difference (p>0.01). Therefore, the entire null hypothesis in this group was accepted. On the quality of image, using signal to noise ratio to assess both Flash and Spiral scan mode, there was no significant difference in the display (p>0.01). It was recommended that for those patients who could not fit in clinical examination and needed in a short time to scan under a lower radiation dose, in order to assume the similar quality of image, Flash mode is a preferred choice. |
本系統中英文摘要資訊取自各篇刊載內容。