Abstract: The clinical data of 70 patients with pelvic tumors who were diagnosed by CT and MRI from October 2018 to October 2019 were analyzed retrospectively. To investigate the diagnostic value of 1.5T MRI diffusion weighted imaging, CT and its combined use in the diagnosis of benign and malignant female pelvic tumors. There were 80 lesions in 70 patients, including 12 cases of cervical cancer, 37 cases of hysteromyoma, 11 cases of ovarian cancer, 20 cases of ovarian cysts, 23 cases of malignant tumors and 57 cases of benign tumors. 71 lesions were diagnosed accurately by MRI, the accuracy rate of diagnosis was 88.75%, the accuracy rate of diagnosis of malignant tumor was 86.96%. 68 lesions were diagnosed accurately by CT, the accuracy rate of diagnosis was 85.00%, the accuracy rate of diagnosis of malignant tumor was 86.96%. 78 cases were accurately diagnosed by combined monitoring, the accuracy rate of diagnosis was 97.50%, the accuracy rate of diagnosis of malignant tumor was 100%. There was no significant difference between CT and MRI in the accuracy rate of diagnosis of benign and malignant tumors in women's pelvis (P>0.05). The accuracy of each MRI or CT rate was significantly lower than that of combined detection (P<0.05). 1.5T-MRI combined with CT can further improve the accuracy of diagnosis of pelvic benign and malignant tumors, greatly educe the probability of missed diagnosis and misdiagnosis.

Key words: accuracy rate, malignant tumor, diffusion weighted imaging, quality of life, pelvic cavity