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다중시기 조영증강 액체감쇠역전회복 자기공명영상은 작은 뇌전이의 발견에 도움이 되는가?

Does Multiphasic Contrast Enhanced Fluid Attenuated Inversion Recovery Magnetic Resonance Imaging Enhance the Detectability of Small Intracerebral Metastases?

  • 김정환 (충북대학교병원 영상의학과) ;
  • 이경식 (충북대학교병원 영상의학과) ;
  • 최치훈 (충북대학교병원 영상의학과) ;
  • 우승태 (바이엘 코리아 영상의학사업부) ;
  • 차상훈 (충북대학교병원 영상의학과)
  • Kim, Jung Hwan (Department of Radiology, Chungbuk National University Hospital) ;
  • Yi, Kyung Sik (Department of Radiology, Chungbuk National University Hospital) ;
  • Choi, Chi-Hoon (Department of Radiology, Chungbuk National University Hospital) ;
  • Woo, Seung Tae (Radiology, Bayer Healthcare Medical Care) ;
  • Cha, Sang-Hoon (Department of Radiology, Chungbuk National University Hospital)
  • 투고 : 2017.07.06
  • 심사 : 2017.09.07
  • 발행 : 2018.03.01

초록

목적: 다중시기 조영증강 액체감쇠역전회복(fluid attenuated inversion recovery; 이하 FLAIR) 자기공명영상을 이용하여 5 mm 이하의 작은 뇌전이를 발견하는 데 가장 적절한 영상 획득 시기를 규명하고 부가적인 가치가 있는지 평가하고자 하였다. 대상과 방법: 조영증강 T1강조영상과 더불어 이중시기 혹은 삼중시기 조영증강 FLAIR영상을 시행한 환자 중 5 mm 이하의 뇌전이가 발견된 29명의 환자에게서 발견된 총 131개의 병변을 대상으로 뇌전이의 발견율, 명암비와 조영증강비를 구하여 각 영상 검사별 차이를 분석하였다. 결과: 조영증강 T1강조영상만을 단독으로 시행했을 때보다 조영증강 FLAIR영상을 추가로 시행했을 때 뇌실질 전이 발견의 민감도, 특이도, 정확도가 증가하는 경향을 보였으나 조영증강 FLAIR영상의 획득 시기별 차이는 없었다. Receiver operating characteristic 커브의 커브아래면적도 조영증강 FLAIR영상을 추가로 시행했을 때 그 값이 유의하게 증가하였다(p < 0.05). 뇌전이 병변의 명암비는 조영 후 FLAIR영상에서 유의하게 높았고(p < 0.001), 조영증강비는 조영증강 T1 강조영상에서 유의하게 높았으나(p < 0.001) 조영증강 FLAIR영상의 획득 시기별 병변의 명암비와 조영증강비에는 차이가 없었다. 결론: 조영증강 FLAIR영상은 작은 뇌전이 발견에 부가적인 가치가 있지만 다중시기 조영증강 FLAIR영상별 차이는 없었다.

Purpose: To determine adequate timing of acquisition of contrast-enhanced fluid attenuated inversion recovery (FLAIR) by using multiphasic contrast-enhanced FLAIR magnetic resonance imaging (MRI) and to evaluate added value in detecting small intracerebral metastases 5 mm or less. Materials and Methods: Twenty-nine patients, that underwent multiphasic contrast-enhanced FLAIR MRI and contrast-enhanced T1 weighted image (T1WI) were included and total number of small intracerebral metastases was 131. Sensitivity, specificity and accuracy of lesion detection were evaluated. Contrast ratio (CR) and enhancement ratio of each lesion were compared and analyzed among each imaging sequence. Results: Sensitivity, specificity and accuracy of lesion detection were increased when contrast-enhanced FLAIR was added to contrast-enhanced T1WI. Area of under receiver operating characteristic curve significantly increased by addition of contrast-enhanced FLAIR than using contrast-enhanced T1WI alone (p < 0.05). CR was significantly higher in contrast-enhanced T1WI than FLAIR (p < 0.001). All of the above results were not different according to time of acquisition of contrastenhanced FLAIR. Conclusion: There was advantage of conducting contrast-enhanced FLAIR MRI, but multiphasic contrast-enhanced FLAIR did not provide additional information for detection of small intracerebral metastases compared with single-phase FLAIR MRI.

키워드

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