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서조 영
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6 : 1.,,,,, X-ray beam penetration (density) (contrast) patch coating, precipitation, flaking centering Esophagus, cardia, fundus, body, angle, antrum, proximal duodenum, distal duodenum compression, mucosal relief, double contrast, prone mucosal coating (grayness), (area gastricae), (mucosal folds) : 1.,,,,,, X-ray beam penetration (density) (contrast) patch coating, precipitation, flaking centering overhead projection overhead,, mucosal coating (white barium line), (grayness), (innominate groove)

7 (n=41) (n=26) (n=70) (n=20) (n=22) (n=40) (n=52) (n=54) (n=22) (n=17) (%) 02% (1/41) 15% (6/40) 00% (0/26) 12% (6/52) (n=44) 27% (12) 48% (21) 03% (2/70) 20% (11/54) (n=29) 55% (16) 34% (10) 10% (2/20) 27% (6/22) (n=4) 25% (1) 25% (1) 05% (1/22) 18% (3/17) (n=77) 23% (29) 42% (32) 03% (6/179) 17% (32/185) 323

8 ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) X- ( ) ( ),,, ( ) ( ) (3 ) (6 ) (6 ) (6 ) CT number (6 ) (6 ) (1 ) (1 ) Scout localization view( ) (1 ) (1 ) (1 ) 324

9 CT 0 10 HU. 8 HU. 4 HU. 1.0 mm. 10 mm. (5 mm 10 mm ) 1 mm mm. [ 3]. 325

10 : 1 Scanogram. 2 (image number, scan time ). (Scaler).. kvp mas. 1 (,, ). ( ) (iliac crest) % (?) %. (50% 3 ). CT 10mm mm. [ 3]. 326

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12 1.,, 2 2.,,., (30 ) + (70 ) = , 2 60.,, 1 MR 2 TR/TE/ (scout) 2 scaler :. 10 : layout 80%,. :. 1 :.. : T2 10 : T2 : T2. : T2. : T1. :. : Menisci. Cruciate ligaments. Collateral ligaments. : 5 mm 2 mm. 10 : 1.2 mm. : 5 mm. : 4 mm. : 1.5 mm : 1 mm. : 4 mm. 4 mm. 1 mm. 1 mm. 328

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14 16.,, ;49(5): X-., , , In , 2001, (CT),., In , 2001, MRI, 22.,,... In.,, 2003, American college of radiology. ACR Mammography quality control 4.. manual. American college of radiology, 1998., In 5..., 1999., , , 2001, MRI., American college of radiology. ACR Barium enema quality control 9..., 2002 manual. American college of radiology, , ,,,, (MRI)..,, 2002, X Och JG, Clarke GD, Sobol WT, Rosen CW, Mun SK. Acceptance, 2002 testing of magnetic resonance imaging systems: report of AAPM 13.. X-. Nuclear Magnetic Resonance Task Group No. 6. Med Phys 1992;, (1): X. 29. Price RR, Axel L, Morgan T, et al. Quality assurance methods and, 2003 phantoms for magnetic resonance imaging: report of the AAPM 15.. X. Nuclear Magnetic Resonance Task Group No. 1. Med Phys, ;17(2):

15 Quality Control of Medical Imaging 1 Joon-Il Choi, M.D., Dong Gyu Na, M.D., Hak Hee Kim, M.D. 2, Yong Moon Shin, M.D. 2, Kook Jin Ahn, M.D. 3, Jae Young Lee, M.D. 1 Department of Radiology, Seoul National University, College of Medicine, and the Institute of Radiation Medicine 2 Department of Diagnostic Radiology, Asan Medical Center, University of Ulsan, College of Medicine 3 Department of Diagnostic Radiology, St. Mary s Hospital, The Catholic University of Korea Medical imaging is the one of the most important diagnostic tools of modern medical science and quality control of the medical imaging is already systemized in the advanced countries. However, in Korea, quality control of medical imaging has not been properly performed until now and low quality examinations have been done without any regulation. The Korean Radiological Society, as society of supervision of medical imaging, has emphasized the importance of quality control and in 2003, the law for the quality control of medical imaging was made. In conformity of the law, the regulation of the quality control of medical imaging will commence, but this is just the beginning and there are still many tasks left for settling down and expanding the range of the quality control of the medical imaging. We reviewed the history of the quality control of medical imaging in Korea and explained the particulars of mammography, fluoroscopy, computed tomography and magnetic resonance imaging. We also looked into future prospect and tasks of the quality control of medical imaging. Index words : Breast radiography, quality assurance Fluoroscopy, quality assurance Computed tomography (CT), quality assurance Magnetic resonance (MR), quality assurance Address reprint requests to : Dong Gyu Na, M.D., Department of Radiology, Seoul National University Hospital, 28 Yongon-dong, Chongno-gu, Seoul , Korea. Tel Fax dgna@radiol.snu.ac.kr 331

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47-55ÀÌÁ¤ÈÖ 47 Fig. 2. Sagittal localizer image of ACR phantom. Table 1. ACR Pulse Sequence Acquisition Parameters Image TR(ms) TE(ms) Matrix FOV(cm) Slice Thickness(mm) Gap(mm) NEX Sagittal Localizer 0200 20 256256