Objective To investigate the value of scrotal ultrasonography in diagnosis of male sterility.Methods The scrotal ultrasonographic features of 162 cases of male sterility were retrospectively analyzed.Results The diagnostic accuracy of scrotal ultrasonography was 69.14％ (112/162) ; scrotal ultrasonography abnormalities were detected in 64 cases of varicocele (34.7％),showed tortuous ducts in spermatic cord and regurgitation in sonogmphy ;testicular microlithiasis disease in 16 cases,13 cases of testicular microlithiasis,36 cases of epididymal cysts,6 cases of hydrocele testis,testicular cyst 5 cases,7 cases of spermduct became thickened.Conclusion Scrotal ultrasonography can clearly show the structure of scrotum and has great value in the diagnosis of male infertility,while ultrasound has a cheap,convenient,high reproducibility and no damage,no pain.It is worthy of wide promotion and application.

Objective To evaluate the clinical values of dual energy lung perfusion using dual-source CT. Methods Fifty-four patients who underwent chest contrast-enhanced CT were included in this study from May to August in 2007. Dual energy CT scanning was performed in all patients. The patients were divided into four groups: normal group, exudation lesion group, mass lesion group, and pulmonary embolism group. Imaging appearances of dual energy CT perfusion in four groups were analyzed. Results Dual energy CT showed symmetrical homogeneous perfusion in healthy subjects (n = 14), exudation lesions (n =10) appeared as low perfusion, In mass lesions (n =27), peripheral masses presented as local perfusion defect, central masses appeared as segmental perfusion defect because of the involvement of hilar vessels,and pulmonary embolism (n = 3) appeared as perfusion defect in corresponding pulmonary segment.Conclusion Dual energy CT scanning can be used to show the pulmonary perfusion status and assess the pulmonary perfusion abnormalities in central lung cancer and pulmonary embolism.