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目的探讨高分辨T2WI在直肠癌局部侵犯术前评价的应用价值。方法 49例临床确诊为直肠癌且未接受放化疗并拟手术切除的患者术前行包括横断位高分辨T2WI和常规T2WI的MRI检查,由两位医师依据横断位高分辨T2WI和常规T2WI对肿瘤局部侵犯进行术前评价,其中37例手术切除患者入选本研究。以手术病理分期为标准,评价高分辨T2WI和常规T2WI对直肠癌局部分期判断的准确性。结果依据高分辨T2WI和常规T2WI读片医师1对直肠癌局部分期术前正确指示率分别为89.2%和62.2%,读片医师2为83.8%和59.5%。两位医师读片结果差异均有统计学意义(P值分别为0.03和0.01)。两位读片医师依据高分辨T2WI和常规T2WI对直肠癌局部侵犯评价一致性检验结果分别为0.77和0.60。结论与常规T2WI比较,高分辨T2WI能提高MRI对直肠癌局部分期术前评价的准确性,应作为直肠癌MRI检查的常规扫描序列。
Objective To investigate the value of high resolution T2WI in the preoperative evaluation of local invasion of rectal cancer. Methods Forty-nine patients with rectal cancer who underwent radiochemotherapy and resection were included in this study. MRI was performed on both high resolution T2WI and conventional T2WI before surgery. The two tumors were examined by high-resolution T2WI and conventional T2WI. Local invasion of preoperative evaluation, including 37 cases of surgical resection were enrolled in this study. The pathological staging was used as the standard to evaluate the accuracy of high-resolution T2WI and conventional T2WI in local staging of rectal cancer. Results According to the results of preoperative staging, the correct preoperative rates of 89.2% and 62.2% for preoperative rectal cancer were 83.8% and 59.5% respectively for high resolution T2WI and conventional T2WI readers. The difference between the two physicians’ reading results was statistically significant (P = 0.03 and 0.01 respectively). Two readers based on high-resolution T2WI T2WI and conventional evaluation of local invasion of rectal cancer assessment consistency test results were 0.77 and 0.60. Conclusion Compared with conventional T2WI, high-resolution T2WI can improve the accuracy of preoperative MRI for local staging of rectal cancer and should be used as a routine scan sequence for MRI of rectal cancer.