MDCT에서 관전압 변화에 따른 노이즈와 선량의 변화
The Variation of Noise and Radiation Dose according to the Tube Voltage in MDCT
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초록
This thesis purposed to know the variation of noise and radiation dose accordingto tube voltage in MDCT. This thesis are all equally scan protocol, the Somatom DefinitionFlash(Germany) by SIMENS Medical System, the voltage transferred into 80,120,140kVp andmeasured with noise and radiation dose. Measurement of the noise is represented by theaverage, sets the same size of the ROI by Calibration QC Phantom measuring 10 times,each of the conditions. The change of noise to the standard of 80-100kVp is decrease46.4%, 80-120kVp is decrease 85.1%, 80-140kVp is decrease 135.9%. The change of valueCTDIvol in change dose to the standard of 80-100kVp is increase 103.1%, 80-120kVp isincrease 206.6%, 80-140kVp is increase 383.4%. The change of value DLP another of anindex the dose measurement to the standard of 80-100kVp is increase 102.8%, 80-120kVpis increase 116.5%, 80-140kVp is increase 382.7%. From the results of this thesis, know adecrease in the noise by the increase of voltage and in order to get the images have ahigh diagnostic value, appropriate noise value must maintain. Therefore dose a patientshould be minimized by using the appropriate voltage.
Abstract
This thesis purposed to know the variation of noise and radiation dose accordingto tube voltage in MDCT. This thesis are all equally scan protocol, the Somatom DefinitionFlash(Germany) by SIMENS Medical System, the voltage transferred into 80,120,140kVp andmeasured with noise and radiation dose. Measurement of the noise is represented by theaverage, sets the same size of the ROI by Calibration QC Phantom measuring 10 times,each of the conditions. The change of noise to the standard of 80-100kVp is decrease46.4%, 80-120kVp is decrease 85.1%, 80-140kVp is decrease 135.9%. The change of valueCTDIvol in change dose to the standard of 80-100kVp is increase 103.1%, 80-120kVp isincrease 206.6%, 80-140kVp is increase 383.4%. The change of value DLP another of anindex the dose measurement to the standard of 80-100kVp is increase 102.8%, 80-120kVpis increase 116.5%, 80-140kVp is increase 382.7%. From the results of this thesis, know adecrease in the noise by the increase of voltage and in order to get the images have ahigh diagnostic value, appropriate noise value must maintain. Therefore dose a patientshould be minimized by using the appropriate voltage.
참고문헌 (6)
- The Korean Society of Medical Imaging Technology, "Textbook of computed Tomograpy" (2005)
- Lim HS, "Computed Tomograpy", pp.300~ (2009), 아카데미아
- Kim YH, "진단방사선검사에서 환자 피폭선량에 관한 연구", 방사선 기술과학, 28, pp.241~248 (2005)
- Kim MC, "컴퓨터 단층촬영시 환자 피폭선량에 관한 연구", 방사선 기술과학, 27, pp.21~27 (2004)
- "ICRP Publication 102: Managing Patient Dose in MultiDetector Computed Tomography (MDCT)", Annals of the ICRP, 37(1)
- Lee DY, "The variation of the Dose and Noise of HRCT according to Tube Voltage in MDCT", 대한전산화단층기술학회지 (2012)