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題名 | 不同轉換因子k-factor於小兒心臟電腦斷層之輻射劑量評估=Assessment of Radiation Dose in Pediatric Heart CT Scan by Different Conversion K-factors |
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作者 | 曾明宗; 呂坤木; 喻仲春; 詹明儒; 李正輝; 陳良光; 蔡裕豐; | 書刊名 | 臺灣應用輻射與同位素雜誌 |
卷期 | 12:2 2016.06[民105.06] |
頁次 | 頁1289-1297 |
分類號 | 416.14 |
關鍵詞 | 256切電腦斷層儀; 心臟電腦斷層; 輻射劑量; 影像品質; 256-slice CT; Cardiac CT; Radiation dose; Image quality; |
語文 | 中文(Chinese) |
中文摘要 | 隨著醫療儀器的快速發展,臨床上電腦斷層攝影(computed tomography, CT)目前已經是主要被用來診斷成人心臟疾病的工具,同樣的技術也逐漸被應用於小兒心臟疾病的診斷。然而,CT 的缺點即是其所產生之輻射劑量問題,且由於小兒的生命週期較長,相對於成人,其接受到輻射劑量後產生癌症的風險相對提高許多,因此在小兒心臟CT 檢查所產生輻射劑量之議題一直是被加以關注的。本研究使用64 切與256 切心臟電腦斷層於無心電閘控(non-gating)掃描技術、回溯性心電閘控(retrospective gated helical, RGH)掃描技術與前瞻式心電閘控掃描技術(prospective gated axial, PGA)掃描技術,配合特定年齡小兒人形假體及熱發光劑量計(thermoluminescence dosimeter, TLD),量測其在檢查中所接受到之輻射劑量。本研究亦使用不同劑量轉換因子,計算掃描時所產生之輻射劑量,並將量測結果與計算結果以及目前已發表之文獻進行比較。研究結果顯示不論於量測結果或使用何種劑量轉換因子計算,256 切PGA 技術相較於其他掃描技術,皆擁有最低之輻射劑量。與其他文獻之劑量比較,與本研究之結果略有差異,其原因為輻射劑量的高低取決於臨床小兒心臟診斷的需求,且與掃描技術及參數有關,因此能兼顧 輻射劑量與影像品質且達到診斷的目的,才是一個理想的檢查。 |
英文摘要 | Recently, computed tomography (CT) is considered to be very useful modality, because the modern CT was able to provide high resolution 3D volume data for evaluation of the chamber, coronary artery and great vessel connection in congenital heart disease. However, radiation is the major inherent limitation of CT. Moreover, cancer risk induced via radiation dose may cause more severe influence on children compared to adults, thus an issue with respect to radiation dose on children should be worth concerned. Our study aimed to investigate the image radiation dose resulting with different radiation conversion factors from various pediatric cardiac CT techniques, including non-gated, retrospectively gated helical (RGH) and prospectively gated axial (PGA) protocols, performed with 64-slice and 256-slice CT for 1-year-old and 5-year-old infant. And we also used pediatric phantom and thermoluminscence dosimeters (TLDs) to measure radiation dose. Results were pointed that factors of radiation does were actually dependent on diagnostic requirement and scanning protocols, and 256-slice CT PGA technique had the lowest radiation dose. Therefore, it may play an important role on a trade-off between radiation dose and image quality for achieving a successful diagnosis objective. |
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