Objective To study the value of MR diffusion weighted imaging(DWI)and apparent diffusion coefficient(ADC)in differentiating benign and malignant lesions of prostate.Methods Twenty-two patients with prostate cancer and 17 patients with benign prostatic hyperplasia confirmed by pathology or biopsy,and 20 healthy volunteers were underwent prostate plain MRI,DWI and enhanced MRI,and measuring the value of ADC in the regions of interest in the workstation,and the ADC values of prostate cancer,benign prostatic hyperplasia,normal prostate were analyzed statistically.Results The ADC of prostate cancer,benign prostatic hyperplasia,normal prostate in central gland and peripheral zone were 1.08 ±0.23,1.43 ±0.27,1.51 ±0.26 and 1.26 ±0.47,1.72 ±0.40,1.75 ± 0.28,respectively,the ADC of prostate cancer was significantly lower than that of benign prostatic hyperplasia and normal prostate,and there was significant difference(P＜ 0.05),but there was no significant difference between benign prostatic hyperplasia and normal prostate(P ＞0.05).Looking the ADC was 1.30 and 1.60 in central gland and peripheral zone as the threshold to distinguish benign and malignant lesions of prostate,had high sensitivity and specificity.Conclusion The application of DWI combined with ADC,has improved the capability of diagnosis and differential diagnosis in benign and malignant lesions of prostate greatly.

OBJECTIVETo explore the imaging value of digital subtraction technique on head and neck with 64-slice spiral CTA.

METHODS958 patients of head and neck vessels were examined with the direct method, Surestart law, low-dose tes methods, Surestart subtraction method, low-dose test subtraction method by CTA, the former three kinds are non-subtraction method, the latter two kinds are subtraction method, a comparative analysis on the five methods from the image quality, imaging time, imaging values, seek for the CTA method with optimal image quality, the shortest imaging time, the best value.

RESULTSThe image quality with the direct method (2.82 points), Surestart law (3.25 points), low-dose test method (3.33 points), Surestart subtraction method (4.10 points), low-dose test subtraction method (4.18 points), gradually changed well in order, the image quality of subtraction method is better than non-subtraction method; imaging time with direct method (40.26 minutes), Surestart law (35.06 minutes), small dose test method (33.49 minutes), Surestart subtraction method (17.52 minutes), small dose test subtraction method (15.32 minutes), gradually become shorter in order, the imaging time of subtraction method is shorter than the non-subtraction method; Evaluation on the sensitivity of aneurysms and stenosis, subtraction method is more better than the non-subtraction method, the little narrow extent and the smaller aneurysm, the subtraction method is more better than non-subtraction method.

CONCLUSIONThe digital subtraction method is an ideal head and neck imaging method with 64-slice spiral CTA.

Adult ; Aged ; Aged, 80 and over ; Angiography, Digital Subtraction ; Cerebral Angiography ; methods ; Female ; Head ; diagnostic imaging ; Humans ; Male ; Middle Aged ; Neck ; diagnostic imaging ; Tomography, Spiral Computed ; methods ; Young Adult