title: [Preoperative T staging of gastric cancer: comparison between MR including diffusion weighted imaging and contrast enhanced CT scan].
abstract: OBJECTIVE
  To compare the accuracy of CT and MR including diffusion-weighted imaging(DWI) in preoperative diagnosis and T staging of gastric cancer.
  
  
  METHODS
  Forty-one patients with gastric cancers proved by gastroscopy biopsy from November 2011 to August 2012 were prospectively enrolled. They underwent contrast enhanced CT and MR imaging (including DWI, T2 weighted and dynamic enhanced imaging) preoperatively. Two radiologists interpreted CT and MR images for detecting and staging each patient independently. With the reference of post-operative histopathological findings, T staging accuracy of CT and MR imaging was calculated and compared. Inter-observer agreement was also evaluated.
  
  
  RESULTS
  Overall T staging accuracy in MR including DWI was significantly higher than that in CT imaging(87.8% vs. 65.9%, P=0.004). MR had a better inter-observer agreement than CT(Kappa=0.813, 0.603, respectively).
  
  
  CONCLUSIONS
  MR including DWI can improve preoperative T staging accuracy of gastric cancer significantly, which deserves recommendation for clinical application.
authors.affiliation: Department of Radiology, The Affiliated Nanjing Drum Tower Hospital, Nanjing University Medical School, Nanjing 210008, China. zyzhou@nju.edu.cn.
authors.forename: Song
authors.initials: S
authors.lastname: Liu
authors.forename: Jian
authors.initials: J
authors.lastname: He
authors.forename: Wenxian
authors.initials: W
authors.lastname: Guan
authors.forename: Qiang
authors.initials: Q
authors.lastname: Li
authors.forename: Zhuping
authors.initials: Z
authors.lastname: Zhou
authors.forename: Haiping
authors.initials: H
authors.lastname: Yu
authors.forename: Shanhua
authors.initials: S
authors.lastname: Bao
authors.forename: Zhengyang
authors.initials: Z
authors.lastname: Zhou
mesh_terms: D001706:Biopsy; D003287:Contrast Media; D038524:Diffusion Magnetic Resonance Imaging; D005773:Gastroscopy; D006801:Humans; D008279:Magnetic Resonance Imaging; D009367:Neoplasm Staging; D013274:Stomach Neoplasms / Q000473:pathology*
chemical_list: D003287:Contrast Media