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Objective To explore the application of diffusion-weighted imaging (DWI) and apparent diffusion coefficient (ADC) value in the diagnosis and differential diagnosis of prostatic cancer. Methods Diffusion-weighted echo-planar imaging (EPI) sequences were performed in 46 patients, including 21 cases of benign prostatic hyperplasia (BPH), 9 cases of chronic prostatitis and 16 cases of prostate cancer. DWI were obtained with a b-factor of 800 s/mm2. According to the pathological results obtained by ultrasound guided biopsy, the peripheral zone of prostate was divided into six parts by orientations and they were divided into noncancerous, hyperplasia, prostatitis and cancerous groups. The ADC value of each region was measured and analyzed with one-way ANOVA and ROC analysis. Results Acceptable images for ADC measurement were obtained in all cases.The mean ADC values of prostatic peripheral zone, prostatic central gland, inflammatory area and cancerous area were (2.20±0. 29)×10-3 mm2/s, (1.66±0.14)×10-3 mm2/s, (1.95±0.34)×10-3 mm2/s and ( 1.24 ± 0.32) × 10-3 mm2/s, respectively. There were statistically significant differences in ADC values between the inter-groups (P＜0. 01 ). With ROC cut point setting to 1.49 ×10-3 mm2/s, the diagnostic sensitivity and specificity for prostate cancer were 86. 8% and 94. 0%, the area under the ROC curve (AUC) was 0. 945±0. 010. Conclusions ADC value might be useful to evaluate prostate cancer. DWI has an important clinical application value in the diagnosis and differentiation of prostate cancer.
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Objective To study the distance of MRI in the practice of correct diagnosed meningioma.Methods 152 cases which have been diagnosed meningioma from MRI scan compared to operation and pathology.16 cases which do not fit the diagnosis from them were analysed.Results There were 10 cases which were misdiagnosed other tumour(6.5%).Other tumour misdiagnosed meningioma were 6 cases(4%).The general misdiagnostic rate was 10.5%.Conclusion Because of complexity in histological structural,equipment function and scan technology,it is inevitable to misdiagnose.If we can pay more attention to the typical character and study the plain film and medical history taking carefully,we could increase correct diagnostic rate of meningioma.