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Objective To investigate the value of vascular disease of lower extremity of 64 slice spiral CT angiography in patients with diabetic foot.Methods 48 patients with diabetic lower limb underwent arterial CT angi-ography,Using CT a variety of post -processing techniques and compared with the original image.Results 48 patients were successfully obtained CTA image,41 patients had peripheral artery disease,40 cases were bilateral,39 cases of unilateral or bilateral had severe stenosis or occlusion;25 cases had obvious collateral circulation.Lower extremity arterial segments CTA and DSA showed good agreement (Kappa Value =0.887).Positive predictive rate was 92.5%,the negative predictive value was 98.6%.After delayed scanning,CTA on the foot artery count develo-ping increased,checked with the DSA consistency.Conclusion 64 slice spiral CTA can accurately and comprehen-sive assessment of lower extremity arterial disease of diabetic foot.Diabetic lower limb vascular lesions can be used as the preferred method of examination.
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<p><b>BACKGROUND</b>¹⁸F-fluorodeoxyglucose positron emission tomography (¹⁸F-FDG PET) is considered as one of the most valuable diagnostic methods of chest malignant tumors, except for pathological diagnosis. But in clinic, the cases whose diagnosis of ¹⁸F-FDG PET is different from pathological diagnosis are not rare. This study is to evaluate the initial value of ¹⁸F-FDG PET in the diagnosis and staging of the chest malignant tumors.</p><p><b>METHODS</b>Fifty-one cases of chest tumors in Xi'an who underwent ¹⁸F-FDG PET were collected. Additionally, pathologic diagnosis had also been experienced on the patients through operation, percutaneous puncture, bronchoscopy or film preparation of pleural fluid. By the comparison of ¹⁸F-FDG PET diagnosis and the pathologic diagnosis, accuracy, sensitivity, specificity, false positive rate, positive predictive and negative predictive of ¹⁸F-FDG PET were calculated.</p><p><b>RESULTS</b>In 51 patients, there were 34 patients whose ¹⁸F-FDG PET diagnoses were consistent with the pathological diagnoses, including 31 true positive, 3 true negative. Out of another 17 patients, 11 were false positive, including 2 sarcoidosis, 6 tuberculosis of the lung, 2 inflammatory pseudotumor of the lung and 1 pulmonary cryptococcosis, and 6 were false negative. The calculated values were 66.67% on the overall accuracy, 83.78% on sensitivity, 21.43% on specificity, 78.57% on false positive rate, 16.21% on false negative rate, 73.81% on positive predictive value and 33.33% on negative predictive value.</p><p><b>CONCLUSIONS</b>Currently, ¹⁸F-FDG PET is still one of the most advanced unwounded technologies for the chest malignant tumor diagnosis. However, this technology experiences difficulties in detection of some high metabolized benign disease, such as tuberculosis from malignant tumor. Hence, in order to take advantage of ¹⁸F-FDG PET technology and have more accurate diagnosis of chest tumors, both results from the ¹⁸F-FDG PET and the clinic actuality should be considered.</p>
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AIM:To study the application of ultrasonic extraction in process of extracting diosgenin from Dioscorea zingiberensis C.H.Wright,and to evaluate its merits.METHODS:A new process of ethanol extracting and hydrochloric acid hydrolysis was provided to extraction diosgenin,and five different extraction methods were studied and compared,and the reaction mechanism was discussed.RESULTS:The ultrasonic extraction method was more efficient.Compared with the traditional water-hydrolylis,extraction rate was 15 percent higher,dosage of hydrochloric acid was registered 90 percent decrease,and the production was purer.CONCLUSION:The grinding pretreatment of Dioscorea zingiberensis is help to enhance the effects of ultrasonic extraction,the method has some advantages in efficiency,energy-saving and low pollution.