Combined T2?weighted and diffusion?weighted MR imaging for staging of rectal cancers
10.3760/cma.j.issn.0253?3766.2018.01.008
- VernacularTitle:T2加权成像和扩散加权成像在直肠癌分期中的应用
- Author:
Chongda ZHANG
1
;
Hongmei ZHANG
;
Yankai MENG
;
Feng YE
;
Jun JIANG
;
Han OUYANG
;
Xinming ZHAO
;
Chunwu ZHOU
Author Information
1. 100021,国家癌症中心 中国医学科学院北京协和医学院肿瘤医院影像诊断科
- Keywords:
Rectal neoplasms;
Magnetic resonance imaging;
Tumor staging;
Diffusion?weighted imaging
- From:
Chinese Journal of Oncology
2018;40(1):46-51
- CountryChina
- Language:Chinese
-
Abstract:
Objective To compare the diagnostic value of T2 weighted imaging ( T2WI) , diffusion?weighted imaging ( DWI) , and T2WI+DWI magnetic resonance imaging ( MRI) for staging of rectal cancers for improving the accuracy of tumor staging. Methods From January 2011 to December 2013, 120 cases of rectal cancers proved by colonoscopy without receiving any anti?tumor treatment were enrolled retrospectively. The MRI data for these patients were divided into three groups, ie., T2WI, DWI and T2WI+DWI, for evaluating the tumor stages. The results were compared with histopathologic findings. The sensitivity and specificity were calculated and compared with chi?square test. The nodal staging was predicted by using T2WI+DWI. Results The accuracy for prediction of tumor staging was 83. 3％, 65. 0％ and 92. 5％ for T2WI, DWI, and T2WI+DWI respectively. The specificity for evaluating T1 and T2 stage, and the sensitivity for evaluating T3 by DWI was significantly lower than those using T2WI and T2WI+DWI in rectal cancers. The sensitivity for evaluation of T2 by DWI was lower than that using T2WI+DWI ( 63. 0％ vs. 88.9％) . The sensitivity for evaluation T2 and specificity for T3 by T2WI+DWI was higher than thouse using T2WI only (88.9％ vs. 51.9％, 94.0％ vs. 72.0％). The accuracy for prediction of nodal staging by using T2WI+DWI was 62.1％ ( 72/116) . Conclusions T2WI is the key sequence for staging of rectal cancers. Although the diagnostic accuracy was not good by using DWI alone, the combination of T2WI and DWI can improve the accuracy significantly for tumor staging in rectal cancers, whereas the nodal staging was still a hard task for radiologists.
