title: [Value of diffusion-weighted MRI in the diagnosis of T staging for rectal cancer].
abstract: OBJECTIVE
  To investigate the value of diffusion-weighted imaging (DWI) in the diagnosis of T staging for rectal cancer.
  
  
  METHODS
  Clinicopathologic data and MR images of 46 patients with rectal cancer in our hospital from July 2013 to September 2014 were retrospectively analyzed. The diagnostic sensitivity, specificity and accuracy of T2WI were compared with those of T2WI plus DWI in T staging for rectal cancer. The relationship of mean apparent diffusion coefficient (ADC) value with different T stages of rectal cancer was analyzed.
  
  
  RESULTS
  There were no significant differences in the diagnostic sensitivity, specificity and accuracy between T2WI and T2WI plus DWI (all P>0.05). The mean ADC value of DWI performed in pathologic T2, T3a, T3b, T3c and T4 stage was (1.110 ± 0.117) × 10⁻³ mm²/s, (1.035 ± 0.121) × 10⁻³ mm²/s, (0.948 ± 0.109) × 10⁻³ mm²/s, (0.932 ± 0.122) × 10⁻³ mm²/s and (0.843 ± 0.050) × 10⁻³ mm²/s, respectively (F=6.972, P=0.000).
  
  
  CONCLUSIONS
  DWI can serve as a complement for T2WI in the diagnosis of T stage patients with rectal cancer, and its ADC value presents a downward trend with the advance of T stage.
authors: Department of Radiology, Changshu Hospital Affiliated to Soochow University, Suzhou 215500, China. luzhihua79@163.com.
authors: Zhihua
authors: Z
authors: Lu
authors: Weixin
authors: W
authors: Qian
authors: Wenhong
authors: W
authors: Cao
authors: Honghuan
authors: H
authors: Yao
authors: Xiaowei
authors: X
authors: Zhou
authors: Yan
authors: Y
authors: Cao
mesh_terms: D038524:Diffusion Magnetic Resonance Imaging; D006801:Humans; D009367:Neoplasm Staging; D012004:Rectal Neoplasms; D012189:Retrospective Studies