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Usefulness of High-B-value Diffusion - Weighted MR Imaging for the Pre-operative Detection of Rectal Cancers

B-values 변환 자기공명영상: 국소 직장암 수술 전 검출을 위한 적합한 b-value 유용성

  • 이재승 (한동대학교 선린의료원 종양학과) ;
  • 구은회 (서울대학교병원 영상의학과 자기공명영상실) ;
  • 이선엽 (한림성심대학 방사선과) ;
  • 박철수 (한림성심대학 방사선과) ;
  • 최지원 (전주대학교 방사선학과)
  • Published : 2009.12.28

Abstract

The purpose of this study is to evaluate the usefulness of high-b-values diffusion weighted magnetic resonance imaging for the preoperative detection of focal rectum cancers. 60patients with diffusion weighted imaging were evaluated for the presence of rectal cancers. Forty were male and twenty were female, and their ages ranged from 38 to 71 (mean, 56) years. Used equipment was 1.5Tesla MRI((GE, General Electric Medical System, Excite HD). Examination protocols were used the fast spin echo T2, T1 weighted imaging. All examination protocols were performed by the same location with diffusion weighted imaging for accuracy detection. The b-values used in DWI were 250, 500, 750, 1000. 1500, 2000$(s/mm^2)$. The rectum, bladder to tumor contrast-to-noise ratio (CNR) of MR images were quantitativlely analyzed using GE software Functool tool, four experienced radiologists and three radiotechnologists qualitatively evaluated image quality in terms of image artifacts, lesion conspicuity and rectal wall. These data were analysed by using ANOVA and Freedman test with each b-value(p<0.05). Contrast to noise ratio of rectum, bladder and tumor in b-value 1000 were 27.21, 24.44, respectively(p<0.05) and aADC value was $0.73\times10^{-3}$. As a qualitative analysis, the conspicuity and discrimination from the rectal wall of lesions were high results as $4.0\pm0.14$, $4.4\pm0.16$ on b-value 1000(p<0.05), image artifacts were high results as $4.8\pm0.25$ on b-value 2000(p<0.05). In conclusion, DWI was provided useful information with depicting the pre-operative detection of rectal cancers, High-b-value 1000 image was the most excellent DWI value.

Keywords

Fast Spin Echo;Rectal Cancer;Diffusion Weighted Image;Apparent Diffusion Coefficient

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