대한방사선기술학회지:방사선기술과학 (Journal of radiological science and technology)

  • 제46권2호
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  • Pages.99-106
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  • 2023
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  • 2288-3509(pISSN)
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  • 2384-1168(eISSN)
대한방사선과학회 (Korean Society of Radiological Science)
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두부 CT 검사 시 테이블 높이에 따른 선량과 화질에 관한 연구

A Study on Radiation Dose and Image Quality according to CT Table Height in Brain CT

  • 김기원 (한전의료재단 한일병원 영상의학과) ;
  • 오주영 (연세암병원 방사선종양학과) ;
  • 민정환 (신구대학교 방사선학과) ;
  • 이상선 (한전의료재단 한일병원 영상의학과) ;
  • 이영봉 (한전의료재단 한일병원 영상의학과) ;
  • 임경환 (한전의료재단 한일병원 영상의학과) ;
  • 이윤 (고려대학교 의료영상공학과)
  • Ki-Won Kim (Department of Radiology, Han-il General Hospital) ;
  • Joo-Young Oh (Department of Radiation Oncology, Yeonsei Cancer Center) ;
  • Jung-Whan Min (Department of Radiological Science, Shin-gu University) ;
  • Sang-Sun Lee (Department of Radiology, Han-il General Hospital) ;
  • Young-Bong Lee (Department of Radiology, Han-il General Hospital) ;
  • Kyung-Hwan Lim (Department of Radiology, Han-il General Hospital) ;
  • Yun Yi (Department of Medical Imaging Engineering, Korea University)
  • 투고 : 2023.02.27
  • 심사 : 2023.03.17
  • 발행 : 2023.04.30
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초록

The height of the table should be considered important during computed tomography (CT) examination, but according to previous studies, not all radiology technologists set the table at the patient's center at the examination, which affects the exposure dose and image quality received by the patient. Therefore, this study intends to study the image quality exposure dose according to the height of the table to realize the optimal image quality and dose during the brain CT scan. The head phantom images were acquired using Philips Brilliance iCT 256. When the image was acquired, the table height was adjusted to 815, 865, 915, 965, 1015, and 1030 mm, respectively, and each scan was performed 3 times for each height. For the exposure dose measurement, optically stimulated luminescence dosimeter (OSLD) was attached to the front, side, eye, and thyroid gland of the head phantom. In the signal to noise ratio (SNR) measurement result, The SNR values for each table height were all lower than 915 mm. As a result of exposure dose, the exposure dose on each area increased as the table height decreased. The height of the table has a close relationship with the patient's radiation exposure dose in the CT scan.

키워드

참고문헌

  1. Kim DW, Kim HS, Park SO, Park JS, You BH, Lee KS, et al. Textbook of computed tomography. Dae-hak Publishing Co.; 2010.
  2. You IC. A study on the image quality and dose in sequence mode and spiral mode in brain CT [master's thesis]. Sejong: Korea University; 2022.
  3. Kubo T, Ohno Y, Kauczor HU, Hatabu H. Radiation dose reduction in chest CT-review of available options. Eur J Radiol. 2014;83(10):1953-61. https://doi.org/10.1016/j.ejrad.2014.06.033
  4. Dalrymple GV, Goulden ME, Kollmorgen GM, Vogel H. Medical radiation biology. Philadelphia: WB Saunders Company; 1973:235.
  5. Nishizawa K, Maruyama T, Takayama M, Okada M, Hachiya J, Furuya Y. Determinations of organ doses and effective dose equivalents from computed tomographic Examination. Br J Radiol. 1991;64(757): 20-8. https://doi.org/10.1259/0007-1285-64-757-20
  6. Rothenberg LN, Pentlow KS. Radiation dose in CT. Radiographics. 1992;12(6):1225-43. https://doi.org/10.1148/radiographics.12.6.1439023
  7. Kim HJ. Usefulness evaluation of application of metallic algorithm reducing for beam hardening artifact occur in typical brain CT image. J. Korean Soc. Radiol. 2017;11(1):389-95.
  8. Kim MC. The latest CT imaging technology studies theory QC. Chung-ku Publishing Co.; 2007.
  9. Kwon SM, Kim JS. The evaluation of eye dose and image quality according to the new tube current modulation and shielding techniques in brain CT. J. Korean Soc. Radiol. 2015;9(5):279-85. https://doi.org/10.7742/jksr.2015.9.5.279
  10. Hong DH. Research of protocols for optimization of exposure dose in abdominopelvic CT. J. Radiol. Sci. Technol. 2017;40(2):245-51. https://doi.org/10.17946/JRST.2017.40.2.09
  11. Moon IB, Kwak JG, Sung HJ, Park SW, Kim MH, Dong KR. Evaluation of noise and SNR according to change of tube voltage by CT equipment-comparison of automatic exposure control method and manual exposure control method-. Journal of Radiation Industry. 2018;12(3):233-7.
  12. Lee JW, Jung HM. Evaluation of radiation dose and image quality according to CT table height. J. Korean Soc. Radiol. 2017;11(6):453-8.
  13. Li J, Udayasankar UK, Toth TL, Seamans J, Small WC, Kalra MK. Automatic patient centering for MDCT: Effect on radiation dose. AJR Am J Roentgenol. 2007;188(2):547-52. https://doi.org/10.2214/AJR.06.0370
  14. Toth T, Ge Z, Daly MP. The influence of patient centering on CT dose and image noise. Med Phys. 2007;34(7):3093-101. https://doi.org/10.1118/1.2748113
  15. Habibzadeh MA, Ay MR, Kamali Asl AR, Ghadiri H, Zaidi H. Impact of miscentering on patient dose and image noise in X-ray CT imaging: Phantom and clinical studies. Phys Med. 2012;28(3):191-9. https://doi.org/10.1016/j.ejmp.2011.06.002
  16. Kaasalainen T, Palmu K, Lampinen A. Effect of vertical positioning on organ dose, image noise and contrast in pediatric chest CT-phantom Study. Pediatr Radiol. 2013;43(6):673-84. https://doi.org/10.1007/s00247-012-2611-z
  17. Kaasalainen T, Palmu K, Reijonen V. Effect of patient centering on patient dose and image noise in chest CT. AJR Am J Roentgenol. 2014;203(1): 123-30. https://doi.org/10.2214/AJR.13.12028
  18. Marsh RM, Silosky MS. The effects of patient positioning when interpreting CT dose metrics: A phantom study. Med Phys. 2017;44(4):1514-24. https://doi.org/10.1002/mp.12137
  19. Akin-Akintayo OO, Alexander LF, Neill R, Krupinksi EA, Tang X, Mittal PK, et al. Prevalence and severity of off-centering during diagnostic CT: Observations from 57,621 CT scans of the chest, abdomen, and/or pelvis. Curr Probl Diagn Radiol. 2019;48(3):229-34. https://doi.org/10.1067/j.cpradiol.2018.02.007
  20. Barreto I, Lamoreux R, Olguin C, Quails N, Correa N, Rill L, et al. Impact of patient centering in CT on organ dose and the effect of using a positioning compensation system: Evidence from OSLD measurements in postmortem subjects. J Appl Clin Med Phys. 2019;20(6):141-51. https://doi.org/10.1002/acm2.12594
  21. Penny W, Friston K, Ashburner J, Kiebel S, Nichols T. Statistical Parametric Mapping: The Analysis of Function Brain Images. Elsevier; 2006.
  22. Wolf I, Vetter M, Wegner I, Bottger T, Nolden M, Schobinger M, et al. The medical imaging interaction toolkit. Medical Image Analysis. 2005;9(6): 594-604. https://doi.org/10.1016/j.media.2005.04.005
  23. Kim KW, Kwon YR, Seo SW, Kwon KT, Oh JY, Son SY, et al. Comparison of exposure dose by using AEC mode of abdomen AP study in radiography. J. Radiol. Sci. Technol. 2015;38(3):205-11. https://doi.org/10.17946/JRST.2015.38.3.03
  24. Son SY, Choi KW, Min JW, Son JH, Kim KW, Jung JH, et al. Evaluation of quantitative on T-spine exhalation technique and T-spine breathing technique of natural breathing. Journal of the Korea Academia-Industrial Cooperation Society. 2013;14(9):4429-36. https://doi.org/10.5762/KAIS.2013.14.9.4429
  25. Kim KW, Min JW, Lyu KY, Kim JM, Jeong HW, Lee JA, et al. Comparison study on CNR and SNR of thoracic spine lateral radiography. J. Radiol. Sci. Technol. 2013;36(4):273-80.
  26. You BG, Lee JS, Jang KJ, Jeon SH, Kim YS, Kweon DC. Comparison radiation dose of Z-axis automatic tube current modulation technique with fixed tube current multi-detector row CT scanning of lower extremity venography. J. Radiat. Prot. Res. 2007;32(3):123-33.
  27. Lee DH, Kim JG, Dae CM, Min KH, Kim SR, Cho PK. The influence of radiation dose and image quality in accordance with bowtie filter size and miscentering of X-axis direction. Journal of Korean Society of Computed Tomographic Technology. 2011;13(2):93-104.
  28. Miyati T, Fujita H, Kasuga T, et al. Measurements of MTF and SNR(f) using a subtraction method im MRI. Physics in Medicine and Biology. 2002;47: 2961-72. https://doi.org/10.1088/0031-9155/47/16/311
  29. Jeong HW, Min JW, Kim JM, et al. Performance Characteristic of a CsI(Tl) Flat Panel Detector Radiography System. Journal of Radiological Science and Technology. 2012;35(2):109-17.
  30. Kim KW, Jeong HW, Min JW, et al. Measurement of Image Quality According to the Time of Computed Radiography System. Journal of Radiological Science and Technology. 2015;38(4):365-74. https://doi.org/10.17946/JRST.2015.38.4.05
  31. Kim KW, Jeong HW, Min JW, et al. Evaluation of the Modulation Transfer Function for Computed Tomography by Using American Association Physics Medicine Phantom. Journal of Radiological Science and Technology. 2016;39(2):193-8. https://doi.org/10.17946/JRST.2016.39.2.09