- Volume 37 Issue 2
DOI QR Code
Radiation Dose and Image Quality of Low-dose Protocol in Chest CT: Comparison of Standard-dose Protocol
흉부 CT촬영에서 저선량 프로토콜의 선량과 화질: 표준선량 프로토콜과 비교
- Lee, Won-Jeong (Occupational Lung Diseases Institute, KCOMWEL) ;
- Ahn, Bong-Seon (Department of Radiological Technology, Daejeon Health Science College) ;
- Park, Young-Sun (Department of Radiological Technology, Daejeon Health Science College)
- Received : 2012.03.16
- Accepted : 2012.06.05
- Published : 2012.06.30
The purpose of this study was to compare radiation dose and image quality between low-dose (LDP) and standard-dose protocol (SDP). LDP (120 kVp, 30 mAs, 2-mm thickness) and SDP (120 kVp, 180 mAs, 1.2-mm thickness) images obtained from 61 subjects were retrospectively evaluated at level of carina bifurcation, using multi-detector CT (Brilliance 16, Philips Medical Systems). Signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were calculated at ascending aorta and infraspinatus muscle, from CT number and back-ground noise. Radiation dose from two protocols measured at 5-point using acrylic-phantom, and CT number and noise measured at 4-point using water-phantom. All statistical analysis were performed using SPSS 19.0 program. LDP images showed significantly more noise and a significantly lower SNR and CNR than did SDP images at ascending aorta and infraspinatus muscle. Noise, SNR and CNR were significantly correlated with body mass index (p<0.001). Radiation dose, SNR and CNR from phantom were significant differences between two protocols. LDP showed a significant reduction of radiation dose with a significant change in SNR and CNR compared with SDP. Therefore, exposure dose on LDP in clinical applications needs resetting highly more considering image quality.
- 건강보험심사평가원. CT촬영비용 및 장비설치현황. http://stat.kosis.kr/nsieu/index.jsp?hOrg=354.
- International Commission on Radiological Protection. Managing patient dose in computed tomography. ICRPPublication 87. Oxford; Pegamon Press. 2000.
- Rydberg J, Buckwalter KA, Caldemeyer KS, Phillips MD, Conces DJ Jr, Aisen AM, Persohn SA, Kopecky KK. Multisection CT: scanning techniques and clinical applications. Radiographics. 2000;20(6):1787-1806. https://doi.org/10.1148/radiographics.20.6.g00nv071787
- Tzedakis A, Damilakis J, Perisinakis K, Stratakis J, Gourtsoyiannis N. The effect of z overscanning on patient effective dose from multidetector helical computed tomography examinations. Med. Phys. 2005;32(6):1621-1629. https://doi.org/10.1118/1.1924309
- McCollough CH, Bruesewitz MR, Kofler(Jr) JM. CT dose reduction and dose management tools: Overview of available options. Radiographics. 2006;26(2):503-512. https://doi.org/10.1148/rg.262055138
- Heyer CM, Mohr PS, Lemburg SP, Peters SA, Nicolas V. Image quality and radiation exposure at pulmonary CT angiography with 100- or 120-kVp protocol: Prospective raddomized study. Radiology. 2007;245(2):577-583. https://doi.org/10.1148/radiol.2452061919
- Goo HW. CT radiation dose optimization and estimation: an update for radiologists. Korean. J. Radiol. 2012;13(1):1-11. https://doi.org/10.3348/kjr.2012.13.1.1
- Naidich DP, Marshall CH, Gribbin C, Arams RS, McCauley DI. Low-dose CT of the lungs: preliminary observations. Radiology. 1990:175(3):729-731. https://doi.org/10.1148/radiology.175.3.2343122
- Johkoh T, Honda O, Yamamoto S, Tomiyama N, Koyama M, Kozuka T, Mihara N, Hamada S, Narumi Y, Nakamura H, Kudo M. Evaluation of image quality and spatial resolution of low-dose high-pitch multidetector-row helical high-resolution CT in 11 autopsy lungs and a wire phantom. Radiat. Med. 2001;19(6):279-284.
- Fasola G, Belvedere O, Aita M, Zanin T, Follador A, Cassetti P, Meduri S, De Pangher V, Pignata G, Rosolen V, Barbone F, Grossi F. Low-dose computed tomography screening for lung cancer and pleural mesothelioma in an asbestos-exposed population: baseline results of a prospective, nonrandomized feasibility trial--an Alpe-adria Thoracic Oncology Multidisciplinary Group Study (ATOM 002). Oncologist. 2007;12(10):1215-1224. https://doi.org/10.1634/theoncologist.12-10-1215
- Stolzmann P, Leschka S, Betschart T, Desbiolles L, Flohr TG, Marincek B, Alkadhi H. Radiation dose values for various coronary calcium scoring protocols in dual-source CT. Int. J. Cardiovasc. Imaging. 2009;25(4):443-451. https://doi.org/10.1007/s10554-008-9397-y
- Prakash P, Kalra MK, Gilman MD, Shepard JAO, Digumarthy SR. Is weight-based adjustment of automatic exposure control necessary for the reduction of chest CT radiation dose? Korean. J. Radiol. 2010;11(1):46-53. https://doi.org/10.3348/kjr.2010.11.1.46
- Kubo T, Lin PJ, Stiller W, Takahashi M, Kauczor HU, Ohno Y, Hatabu H. Radiation dose reduction in chest CT: a review. AJR. Am. J. Roentgenol. 2008;190(2):335-343. https://doi.org/10.2214/AJR.07.2556
- Itoh S, Ikeda M, Arahata S Kodaira T, Isomura T, Kato T, Yamakawa K, Maruyama K, Ishigaki T. Lung cancer screening: minimum tube current required for helical CT. Radiology. 2000;215(1): 175-183. https://doi.org/10.1148/radiology.215.1.r00ap16175
- 한국의료영상품질관리원. 전산화단층촬영장치 품질관리 검사. http://www.ikiami.or.kr/info/KMI417QD.aspx
- Huda W, Ogden KM, Khorasani MR. Converting dose-length product to effective dose at CT. Radiology. 2008;248(3):995-1003. https://doi.org/10.1148/radiol.2483071964
- Qi W, Li J, Du X. Method for automatic tube current selection for obtaining a consistent image quality and dose optimization in a cardiac multidetector CT. Korean J Radiol. 2009;10(6):568-574. https://doi.org/10.3348/kjr.2009.10.6.568
- Park EA, Lee W, Kang JH, Yin YH, Chung JW, Park JH. The Image Quality and Radiation Dose of 100-kVp versus 120-kVp ECG-Gated 16-Slice CT Coronary Angiography. Korean. J. Radiol. 2009;10(3): 235-243. https://doi.org/10.3348/kjr.2009.10.3.235
- Takahashi M, Maguire WM, Ashtari M, Khan A, Papp Z, Alberico R, Campbell W, Eacobacci T, Herman PG. Low-dose spiral computed tomography of the thorax comparison with the standard-dose technique. Invest. Radiol. 1998; 33(2):68-73. https://doi.org/10.1097/00004424-199802000-00002
- Prasad SR, Wittram C, Shepard JA, McLoud T, Rhea J. Standard-dose and 50%-reduced-dose chest CT: comparing the effect on image quality. AJR. Am. J. Roentgenol. 2002;179(2):461-465. https://doi.org/10.2214/ajr.179.2.1790461
- A Study of The Correlation of The Area Dose with Residual CT Contrast Media and MRI Contrast Media during The Use of General Imaging Automatic Exposure Control System vol.10, pp.8, 2016, https://doi.org/10.7742/jksr.2016.10.8.619
- Development and Characterization of a Dosimeter Using Tissue-Equivalent Scintillator by Photon-Counting Method vol.23, pp.1, 2014, https://doi.org/10.5369/JSST.2014.23.1.29