[Preoperative T staging of gastric cancer: comparison between MR including diffusion weighted imaging and contrast enhanced CT scan]. OBJECTIVE
 To compare the accuracy of CT and MR including diffusion-weighted imaging(DWI) in preoperative diagnosis and T staging of gastric cancer.


 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.  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).



CT
[Preoperative T staging of gastric cancer: comparison between MR including diffusion weighted imaging and contrast enhanced CT scan]. To compare the accuracy of CT and MR including diffusion-weighted imaging(DWI) in preoperative diagnosis and T staging of gastric cancer.


 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.  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).


 MR including DWI can improve preoperative T staging accuracy of gastric cancer significantly, which deserves recommendation for clinical application.
MR
To compare the accuracy of CT and MR including diffusion-weighted imaging(DWI) in preoperative diagnosis and T staging of gastric cancer.


 They underwent contrast enhanced CT and MR imaging (including DWI, T2 weighted and dynamic enhanced imaging) preoperatively.  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 including DWI can improve preoperative T staging accuracy of gastric cancer significantly, which deserves recommendation for clinical application.
DWI
[Preoperative T staging of gastric cancer: comparison between MR including diffusion weighted imaging and contrast enhanced CT scan].
CT scan
[Preoperative T staging of gastric cancer: comparison between MR including diffusion weighted imaging and contrast enhanced CT scan]. To compare the accuracy of CT and MR including diffusion-weighted imaging(DWI) in preoperative diagnosis and T staging of gastric cancer.


 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.  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 including DWI can improve preoperative T staging accuracy of gastric cancer significantly, which deserves recommendation for clinical application.
MRI