Effects of CT Contrast Medium on the Relaxation Rate of MR Contrast Medium

CT 조영제가 MR 조영제의 이완율에 미치는 영향

  • Kwon, Soon-Yong (Department of Radiology, Konkuk University Medical Center) ;
  • Kang, Chung-Hwan (Department of Radiology, Konkuk University Medical Center) ;
  • Jeong, Hyeon Keum (Department of Medical Imaging Engineering, Korea University) ;
  • Park, Jin Seo (Department of Radiology, Konkuk University Medical Center) ;
  • Kim, Seong-Ho (Department of Radiology, Konkuk University Medical Center)
  • 권순용 (건국대학교병원 영상의학과) ;
  • 강충환 (건국대학교병원 영상의학과) ;
  • 정현근 (고려대학교대학원 의료영상공학과) ;
  • 박진서 (건국대학교병원 영상의학과) ;
  • 김성호 (건국대학교병원 영상의학과)
  • Received : 2017.10.16
  • Accepted : 2018.04.14
  • Published : 2018.04.30


In MR, the iodine CT contrast medium reduces the T1 and T2 relaxation times of the substance, resulting in a change in signal intensity. This study aimed to measure the relaxation rate of MR contrast medium with or without diluting CT contrast medium and analyzed the effect of CT contrast medium. Undiluted Gadoteridol solution was diluted with saline to prepare MR contrast medium phantoms with various levels of Gadoteridol concentrations. Moreover, undiluted Iomeprol was mixed with the prepared MR contrast medium phantoms at 1:1 ratio to make MR contrast medium phantoms with containing CT contrast medium for the experiment. T1 and T2 mappings were conducted to quantitatively evaluate the relaxation time and relaxation rate of these phantoms. The results showed that the T1 and T2 relaxation time and relaxation rate of MR contrast medium diluted with CT contrast medium were significantly (p<0.05) shorter than those of MR contrast medium not diluted with CT contrast medium. The results of this study imply that, when MR contrast medium shall be used after injecting CT contrast medium, CT contrast medium should be discharged enough. Moreover, it would be desirable to conduct CT test after taking MRI test in order to reduce the effects of CT contrast medium on MR contrast medium.


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