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頁籤選單縮合
題 名 | 256切小兒假體心臟電腦斷層之影像品質及輻射劑量評估=Applications of Pediatric Phantoms for Image Quality and Radiation Dose in 256-Slice Cardiac CT Examination |
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作 者 | 呂坤木; 紀卓永倫; 陳良光; 李正輝; 盧建利; 劉冠忻; 蔡裕豐; | 書刊名 | 中華放射線技術學雜誌 |
卷 期 | 40:2 2016.06[民105.06] |
頁 次 | 頁83-89 |
分類號 | 416.14 |
關鍵詞 | 小兒; 256切電腦斷層儀; 心臟電腦斷層; 輻射劑量; 影像品質; Child; 256-slice CT; Cardiac CT; Radiation dose; Image quality; |
語 文 | 中文(Chinese) |
中文摘要 | 電腦斷層目前雖已廣泛應用於成人的心臟冠狀動脈檢查,然而面對小兒這種擁有高心率且心血管結構更小的族群,電腦斷層在其心臟檢查上有其挑戰性,且輻射劑量於小兒族群身上所造成的致癌風險更是需被加以關注的。新型寛排256 切電腦斷層比起以往,有著很大的躍進,可大幅下降掃描時間,有效地降低運動假影和階梯狀假影發生機率,提升高心率小兒族群之心臟電腦斷層檢查的可診斷性。本研究使用一歲與五歲小兒人形假體及熱發光劑量計於256 切電腦斷層上,評估其在檢查中所接收到的輻射劑量和影像品質,以及比較無心電閘控掃描技術、回溯性心電閘控掃描技術與前瞻式心電閘控掃描技術於小兒心臟檢查上輻射劑量和影像品質之差異。本研究結果顯示,不論於一歲或五歲假體,劑量最高為使用回溯性心電閘控掃描技術,劑量最低為前瞻式心電閘控掃描技術;於影像品質方面,無心電閘控掃描技術與前瞻式心電閘控掃描技術的雜訊都比回溯性心電閘控掃描技術者低。根據本研究結果提出以下建議,輻射劑量的高低和影像品質的好壞取決於臨床小兒心臟診斷的需求以及掃描技術和參數,不同診斷目標即有不同的劑量結果和影像品質的需求,能在輻射劑量與影像品質間取得平衡點且達到診斷目的,才是一個有效的檢查。 |
英文摘要 | Computed tomography (CT) has been widely used in assessment of CT coronary angiography (CTCA) for adult population; however, it is still a challenge on CT underwent cardiac examinations for pediatric population. It is due to higher heart rate and smaller cardiovascular structures in children. Moreover, cancer risk induced via radiation dose on children should be worth concerned. With technical development of a 256-slice CT scanner in providing faster scanning time, motion and step-stair artifacts could effectively reduced. For these reasons, it might potentially be able to image patients with higher heart rates, especially for children. Therefore, in this study pediatric phantom and thermoluminscence dosimeters (TLDs) with application of different clinical scanning protocols on 256-slice CT were used to simulate pediatric cardiac CT examinations in evaluating the differences on radiation dose and image quality. Regardless of pediatric phantom aged one or five, our results were pointed that the dose of prospective gated axial was lower than the retrospective gated helical and the noise of non-gated and prospective gated axial were lower than retrospective gated helical imaging. According to these results, our suggestion was as the following. Factors of radiation dose and image quality were actually dependent on diagnostic requirement and scanning protocols. Therefore, it may play an important role on a trade-off between radiation dose and image quality for achieving a successful diagnosis objective. |
本系統中英文摘要資訊取自各篇刊載內容。