Journal of Radiation Industry (방사선산업학회지)

Korean Society of Radiation Industry (한국방사선산업학회)
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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 -

CT 장비별 관전압의 변화에 따른 노이즈, SNR 평가 - 자동노출제어방법과 수동노출제어방법 비교 -

  • Moon, Il-Bong (Department of Radiological Technology, Gwangju Health University) ;
  • Kwak, Jong-Gil (Department of Public Health and Medicine, Dongshin University Graduate School) ;
  • Sung, Ho-Jin (Department of Radiology, Chonnam National University Hospital) ;
  • Park, Sang-Won (Radiological and Medico-Oncological Sciences, University of Science and Technology) ;
  • Kim, Mi-Hyun (Department of Radiological Technology, Gwangju Health University) ;
  • Dong, Kyung-Rae (Department of Radiological Technology, Gwangju Health University)
  • 문일봉 (광주보건대학교 방사선과) ;
  • 곽종길 (동신대학교 보건의료학과) ;
  • 성호진 (전남대학교병원 영상의학과) ;
  • 박상원 (과학기술연합대학원대학교 방사선종양의과학) ;
  • 김미현 (광주보건대학교 방사선과) ;
  • 동경래 (광주보건대학교 방사선과)
  • Received : 2018.06.30
  • Accepted : 2018.08.20
  • Published : 2018.09.30

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Abstract

Advances in medical technology to evaluate the variety and frequency of the diagnostic test to learn the change of the noise value and the SNR according to the change in the tube voltage as a target in the MDCT trend to increase throughout the world for the high image acquisition and appropriate patient dose. This study in both the scan time, slice thickness, kernel value of S's and the same equipment Somatom Definition Flash Tube voltage 80, 100, 120, is changed to 140 kVp to measure the noise and SNR. Noise and SNR measurement is measured 10 times for each condition by setting the ROI in Clibration QC Phantom of the same size are shown as mean. Change in the noise in the first Care Dose 4D decreased 60.8% increase relative to 80 kVp to 100 kVp to, decreased 46.3% increase in 120 kVp, increasing to 39.8% and decreased to 140 kVp. And mA Fix (200 mA) decreased 63.1% increase in the 100 kVp based 80 kVp, decreased 48.7% increase in 120 kVp, decreased to 41.7% increase in when 140 kVp. First, the change in SNR Care Dose 4D decreased by -100% increase in 100 kVp based 80 kVp, 120 kVp to increase during -366.7% decrease, decreased to -433.3% increase in when 140 kVp and mA fix (200 mA) The 83.3% increase relative to the increase in 100 kVp, 80 kVp, increase 120 kVp increased by 250%, increased from 383.3% increase in when 140 kVp. In this study with an increase in the tube voltage was found with the Noise SNR is reduced, the noise proper to valuable diagnostic image acquisition, with the tube voltage value and the optimum SNR is believed to minimize patient dose.

Keywords

Acknowledgement

Supported by : Gwangju Health University

References

  1. Giesler T, Baum U, Ropers D, Ulzheimer S, Wenkel E, Mennicke M, Bautz W, Kalender WA, Daniel WG and Achenbach S. 2002. Noninvasive visualization of coronary arteries using contrast-enhanced multidetector CT: influence of heart rate on image quality and stenosis detection. Am. J. Roentgenol. 179(4):911-916.
  2. Ha SM, Jung SH, Chang HJ, Park EA and Shim HJ. 2015. Effects of iterative reconstruction algorithm, automatic exposure control on image quality, and radiation dose: phantom experiments with coronary CT angiography protocols. Prog. Med. Phys. 26(1):28-35. https://doi.org/10.14316/pmp.2015.26.1.28
  3. Huh JY, Bhum HN, Jung JB, Kim CG and Sun JB. 2008. A study on the reduction of radiation dose when examining coronary artery through CT tube current modulation employing 64VCT. J. Kor. Soc. Comput. Tomogr. Technol. 10(1):41-45.
  4. Klingenbeck-Regn K, Schaller S, Flohr T, Ohnesorge B, Kopp AF and Baum U. 1999. Subsecond multi-slice computed tomography: basics and applications. Eur. J. Radiol. 31(2): 1999.
  5. Lee CL, Jeon SS, Nam SR, Cho HM, Jung JY and Kim HJ. 2007. Dose measurements using phantoms for tube voltage, tube current, slice thickness in MDCT. Korean J. Med. Phys. 18(3):139-143.
  6. Lee HJ, Kim HS, Lim KB, Kang SH and Lim JS. 2014. The study on functions of Automatic and semi-Automatic in Automatic Tube Voltage Selection software. J. Kor. Soc. Comput. Tomogr. Technol. 16(2):139-150.
  7. McCollough CH and Zink FE. 1999. Performance evaluation of a multi-slice CT system. Med. Phys. 26(11):2223-2230. https://doi.org/10.1118/1.598777
  8. Moon IB, Dong KR and Kim KC. 2016. The impact of the AEC mode of tube current on the dose at CT scans. J. Radia. Ind. 10(2):49-54.
  9. Moon IB, Dong KR, Kim MH, Choi SH, Kwon DC and Goo EH. 2017. Measurement of the Noise according to the slice thickness in MDCT. J. Radia. Ind. 11(3):151-155.
  10. Moon IB, Kim CB and Dong KR. 2014. The variation of noise and radiation dose according to the tube voltage in MDCT. J. Adv. Eng. and Tech. 7(4):175-178.
  11. Moon IB, Kwak JG, Ryu YH, Sung HJ, Goo EH and Dong KR. 2017. Dose comparison according to the tube voltage, the tube current change in CT image. J. Radia. Ind. 11(4):277-281.
  12. Taguchi K and Aradate H. 1998. Algorithm for image reconstruction in multi-slice helical CT. Med. Phys. 25(4):550-561. https://doi.org/10.1118/1.598230
  13. Yoo HJ, Cheong SM and Suh DS. 2010. Radiation dose and image quality in neck angiography: comparison of dual source computed tomography and multi-detector computed tomography. J. Kor. Soc. Comput. Tomogr. Technol. 12(2): 27-32.