Objective To explore the diagnostic value of high-resolution magnetic resonance imaging(HRMRI)combined with intravoxel incoherent motion diffusion weighted imaging(IVIEM-DWI)on extramural vascular invasion(EMVI)of rectal cancer.Methods 82 patients with rectal cancer admitted to our hospital from May 2020 to May 2023 were selected.HRMRI combined with IVIM-DWI were performed before surgery.According to the postoperative pathological examination results,the EMVI score of patients was observed,and the patients were divided into EMVI group and non-EMVI group.The differences in IVIIM-DWI parameters[fast diffusion coefficient(D*)and perfusion fraction(f)]were compared between the two groups,and the diagnostic value of HRMRI and IVlim-DWI alone and combined application on EMVI was analyzed.Results Among 82 patients with rectal cancer,there were 19 cases(23.17％)with EMVI score of 3 points and 13 cases(15.85％)with EMVI score of 4 points.Postoperative pathological results showed that 37 cases(45.12％)of 82 patients with rectal cancer had EMVI,and the D*and f in EMVI group were higher than those in non-EMVI group(P＜0.05).There were 32 cases(39.02％)and 41 cases(50.00％)of EMVI positive patients diagnosed by HRMRI and IVIM-DWI alone,and there were 48 cases(58.54％)of EMVI positive patients diagnosed by combined application.The sensitivities of HRMRI and IVIM-DWI in the diagnosis of EMVI were 67.56％and 75.68％and the specificities were 84.44％and 71.11％respectively.The sensitivity and specificity of combined diagnosis were 91.89％and 68.88％respectively.Kappa consistency analysis showed that the kappa values of HRMRI,IVIEM-DWI alone and combined application in diagnosing EMVI were 0.526,0.463 and 0.592 respectively.Conclusion Both HRMRI and IVIEM-DWI have certain diagnostic value in the diagnosis of EMVI in patients with rectal cancer,and the combined application of the two has higher diagnostic efficiency.
关键词
直肠癌壁外血管侵犯/高分辨率磁共振成像/体素内不相干运动扩散加权成像/诊断
Key words
Extramural Vascular Invasion of Rectal Cancer/High-resolution Magnetic Resonance Imaging/Intravoxel Incoherent Motion Diffusion Weighted Imaging/Diagnosis
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