Abstract：Objective: To investigate the diagnostic value of high resolution 3.0T MRI conventional scan, DWI and DCE MR imaging in TNM staging of rectal cancer. Methods: Twenty-six male and thirty female patients(49~78 years old) with pathologically confirmed rectal cancer were enrolled between January 2013 to May 2016. The imaging sequences included plain sagittal T2WI, axial T2WI, T1WI, DWI, coronary T2WI, fat-suppressed axial and coronal T2WI, axial, sagittal and coronal sequences of T1WI were dynamically enhanced. The image quality of each sequence is evaluated. The results of preoperative MRI staging were compared with the results of postoperative pathological staging. Results: High-resolution MRI in 50 of 56 cases of rectal cancer showed correct T stage. Among the rest 6 cases, two cases of pathologically T1 and T3 were preoperatively misdiagnosed to be T2 respectively. Two cases of T2 were preopreatively misdiagnosed T1. The total coincidence rate was 89.2%(50/56). The coincidence rate of T1 stage was 75%(6/8). The coincidence rate of T2 stage was 91%(20/22). The coincidence rate of T3 stage was 91%(20/22). The coincidence rate of T4 stage was 100%(4/4). The accuracy of MRI in the diagnosis of total T stage were 89.2%(50/56), and the sensitivity and accuracy of combining each sequence in the diagnosis of rectal cancer were superior to that of routine sequence. The time-signal intensity curve of rectal cancer showed an outflow pattern. Dynamic contrast-enhanced scan was superior to other sequences in the detection of rectal cancer and invasion of the surrounding wall. Conclusion: The ideal combination of 3.0T MRI imaging sequences for rectal cancer consists of sagittal T2WI, axial T2WI, T1WI, DWI(b value of 1 000 s/mm2), coronary T2WI and axial, sagittal and coronary enhanced scan, which can be used for preoperative staging of rectal cancer.
宇文谦1，常 红2，李海玲1，石玉铸1，王春立1，王 余3，韩德昌3，李香春3，马梦华3. 高分辨3.0T MRI扫描对直肠癌术前分期的临床应用[J]. 中国临床医学影像杂志, 2017, 28(7): 504-506.
YU Wen-qian1, CHANG Hong2, LI Hai-ling1, SHI Yu-zhu1, WANG Chun-li1,. Clinical application of high-resolution 3.0T MRI in preoperative staging of rectal cancer. JOURNAL OF CHINA MEDICAL IMAGING, 2017, 28(7): 504-506.
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