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研究生:林孟萱
研究生(外文):LIN, MENG-XUAN
論文名稱:低劑量電腦斷層用於腹部掃描品質與劑量探討
論文名稱(外文):The Discussion of Image Quality and Radiation Dose in Abdominal Low Dose Computed Tomography
指導教授:鄭凱元鄭凱元引用關係
指導教授(外文):CHENG, KAI-YUAN
口試委員:林政勳史天宇鄭凱元
口試委員(外文):LIN, ZHENG-XUNSHIH, TIAN-YUCHENG, KAI-YUAN
口試日期:2020-07-23
學位類別:碩士
校院名稱:中臺科技大學
系所名稱:醫學影像暨放射科學系暨研究所
學門:醫藥衛生學門
學類:醫學技術及檢驗學類
論文種類:學術論文
論文出版年:2020
畢業學年度:108
語文別:中文
論文頁數:71
中文關鍵詞:腹部電腦斷層掃描低劑量電腦斷層掃描暴露劑量
外文關鍵詞:abdominal computed tomographylow dose computed tomographyexposure dose
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本次研究利用成人擬人假體針對腹部電腦斷層掃描,改採低劑量電腦斷層掃描模式,評估不同掃描模式之影像訊雜比與曝露劑量。
利用假體進行不同參數掃描,設定條件參數為管電壓80 kVp、120 kVp,管電流100 mAs、200 mAs。影像分別圈選固定之感興趣區域,並比較訊雜比及其胃、脾、肝、腎、膀胱、睪丸、小腸之曝露劑量。
評估影像的訊雜比,影像整體平均訊雜比為0.734,而標準劑量120 kVp, 200 mAs平均訊雜比為1.37,若調降管電壓與管電流為80 kVp, 100 mAs,則平均訊雜比下降為0.283,且影像呈現非常粗糙;若管電壓固定為120 kVp調降管電流為100 mAs則平均訊雜比為0.753,影像訊雜比最佳;測量其曝露劑量後發現,無論管電壓調降與否,在100 mA時睪丸的曝露劑量為0.342 mGy、1.495 mGy都是最高的,而在200 mA時則胃的曝露劑量為2.598 mGy、0.955 mGy,亦為最高暴露劑量之器官。研究發現將電腦斷層掃描參數修改,可獲得比整體平均訊雜比較佳的影像,且曝露劑量最多可以下降67 %,因此使用120 kVp, 100 mAs的掃描參數將可獲的最佳之結果。

In this study, an adult anthropomorphic phantom was used for abdominal computed tomography, and low-dose computed tomography was adopted to evaluate the signal-to-noise ratio and exposure dose of different scanning modes.
Different parameters were used to scan the phantom, The parameters were 80 kVp, 120 kVp, 100 mAs, and 200 mAs. The fixed region of interest was circled in the four groups of images, and the signal-to-noise ratio and exposure doses of the stomach, spleen, liver, kidney, bladder, testis, and small intestine were compared. The average signal-to-noise ratio of the four groups of images was 0.734, and the average signal-to-noise ratio of 120 kVp and 200 mAs was 1.37. If the voltage and current were adjusted to 80 kVp and 100 mAs, then the average signal-to-noise ratio dropped to 0.283, and the image became very rough. When the tube voltage was fixed at 120 kVp and the tube current adjusted 100 mAs, the average signal-to-noise ratio was 0.753, which was the best image signal-to-noise ratio of the four groups. After measuring the exposure dose, it was found that no matter the tube voltage was reduced or not, the exposure doses of the testis were 0.342 mGy and 1.495 mGy at 100 mA, which were the highest in the four groups, while at 200 mA, the exposure doses of the stomach were 2.598 mGy and 0.955 mGy, which were also the highest exposure dose in the four groups .

中文摘要 I
ABSTRACT II
目錄 IV
圖目錄 VII
表目錄 IX
第一章 前言 1
1.1研究背景 1
1.2 研究動機 4
1.3 研究目的 5
1.4論文架構 6
第二章 文獻回顧 7
2.1電腦斷層掃儀之發展 7
2.2輻射劑量對人體的危害 9
2.3電腦斷層掃描之輻射劑量所帶來的影響 13
2.4 MOSFET輻射偵檢器 14
第三章 材料與方法 15
3.1實驗架構 15
3.2實驗流程圖 17
3.3實驗設備 18
3.4 MOSFET輻射偵檢器之導線篩選與校正 21
3.5 MOSFET輻射偵檢器之劑量校正曲線 26
3.6擬人假體 27
3.7儀器條件設定與假體器官佈點 30
3.8 訊雜比分析 32
3.9統計分析 33
3.10電腦斷層之主觀視覺評量法(Visual Grading Analysis, VGA) 34
第四章 結果 35
4.1成人假體劑量量測 35
4.2不同電腦斷層條件之曝露劑量 35
4.3影像訊雜比 40
4.4主觀視覺評量法 46
第五章 討論 49
5.1 MOSFET輻射偵檢器之穩定度 49
5.2訊雜比對影像品質的影響 52
5.3電腦斷層劑量條件的調降 53
第六章 結論 54
第七章 未來展望 56
參考文獻 57
附件一、游離腔校正報告 60


1. Hounsfield GN. Computerized transverse axial scanning (tomography): Part 1. Description of system. The British journal of radiology. 1973;46(552):1016–22.
2. Sahbaee P, Samei E, Segars WP. Patient‐based estimation of organ dose for a population of 58 adult patients across 13 protocol categories. Medical physics. 2014;41(7).

3. Naidich DP, Marshall CH, Gribbin C, Arams RS, McCauley DI. Low-dose CT of the lungs: preliminary observations. 1990;175(3):729–31.
4. Greess H, Lutze J, Nömayr A, Wolf H, Hothorn T, Kalender W. Dose reduction in subsecond multislice spiral CT examination of children by online tube current modulation. European radiology. 2004;14(6):995–9.
5. Kalra MK, Rizzo SM, Novelline RA. Reducing radiation dose in emergency computed tomography with automatic exposure control techniques. Emergency radiology. 2005;11(5):267–74.
6. Kluner C, Hein PA, Gralla O, Hein E, Hamm B, Romano V. Does ultra-low-dose CT with a radiation dose equivalent to that of KUB suffice to detect renal and ureteral calculi? Journal of computer assisted tomography. 2006;30(1):44–50.
7. Mulkens TH, Bellinck P, Baeyaert M, Ghysen D, Van Dijck X, Mussen E. Use of an automatic exposure control mechanism for dose optimization in multi–detector row CT examinations: clinical evaluation. Radiology. 2005;237(1):213–23.
8. NCPR Report No.184.
9. Huda W, Lieberman KA, Chang J, Roskopf ML. Patient size and x‐ray technique factors in head computed tomography examinations. I. Radiation doses. Medical physics. 2004;31(3):588–94.

10. Huda W, Lieberman KA, Chang J, Roskopf ML. Patient size and x‐ray technique factors in head computed tomography examinations. II. Image quality. Medical physics. 2004;31(3):595–601.
11. NCPR Report No.160.
12. Nitta N, Takahashi M, Murata K, Morita R. Ultra low-dose helical CT of the chest: evaluation in clinical cases. 1999;17(1):1–7.
13. Mori K. Detection of pulmonary nodules using helical CT. Haigan. 1995;35(2):149–56.
14. Kaasalainen T, Makela T, Kelaranta A, Kortesniemi M. The Use of Model-based Iterative Reconstruction to Optimize Chest CT Examinations for Diagnosing Lung Metastases in Patients with Sarcoma: A Phantom Study. Academic Radiology. 2019;26(1):50–61.
15. 翁寶山. 臺灣輻射防護史話. 2003.
16. 衛生福利部. 108年醫療機構現況及醫院醫療服務量統計. 2020.
17. Smith-Bindman R, Lipson J, Marcus R, Kim KP, Mahesh M, Gould R, et al. Radiation Dose Associated With Common Computed Tomography Examinations and the Associated Lifetime Attributable Risk of Cancer. 2009;169(22):2078–86.
18. 行政院原子能委員會. 108 年國民輻射劑量評估.
19. Diederich S, Lenzen H, Windmann R, Puskas Z, Yelbuz TM, Henneken S. Pulmonary nodules: experimental and clinical studies at low-dose CT. 1999;213(1):289–98.
20. Nitta N, Takahashi M, Murata K, Morita R. Ultra low-dose helical CT of the chest: evaluation in clinical cases. 1999;17(1):1–7.
21. Rusinek H, Naidich DP, McGuinness G, Leitman BS, McCauley DI, Krinsky GA. Pulmonary nodule detection: low-dose versus conventional CT. Radiology. 1998;209(1):243–9.
22. Diederich S, Lenzen H, Windmann R, Puskas Z, Yelbuz TM, Henneken S. Pulmonary nodules: experimental and clinical studies at low-dose CT. 1999;213(1):289–98.
23. McNitt-Gray MF. AAPM/RSNA physics tutorial for residents: topics in CT: radiation dose in CT. Radiographics. 2002;22(6):1541–53.
24. Brenner DJ, Hall EJ. Current concepts - Computed tomography - An increasing source of radiation exposure. The New England Journal of Medicine. 2007;357(22):2274–84.
25. de Gonzalez AB, Mahesh M, Kim KP, Bhargavan M, Lewis R, Mettler F, et al. Projected Cancer Risks From Computed Tomographic Scans Performed in the United States in 2007. 2009;169(22):2071–7.
26. 清華大學工程與系統科學系. 行政院原子能委員會 委託研究計畫研究報告-電子卡片元件老化和可靠度評估. 2009.
27. Sami A, Martin C, Marco P, Michael L, Peter M, Anatoly R. Direct and pulsed current annealing of p-MOSFET based dosimeter: the “MOSkin”. Physical & Engineering Sciences in Medicine volume. 2014;37:311–9.
28. Biasi G, Su, FY, Al Sudani T, Corde S, Petasecca M, Lerch MLE, et al. On the Combined Effect of Silicon Oxide Thickness and Boron Implantation Under the Gate in MOSFET Dosimeters. IEEE Nuclear and Plasma Sciences Society. 2020;67(3):534–40.
29. ICRP Publication 103.
30. Prasad SR, Wittram C, Shepard JA, McLoud T, Rhea J. Standard-dose and 50%-reduced-dose chest CT: Comparing the effect on image quality. American Journal of Roentgenology. 179(2):2002.
31. Nyman U, Ahl TL, Kristiansson M, Nilsson L, Wettemark S. Patient-circumference-adapted dose regulation in body computed tomography. A practical and flexible formula. Acta Radiologica. 2005;46(4):396–406.


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