Objective To evaluate the prevalence rate of pulmonary malignant disease in people at high risk of lung cancer through low-dose multi-slice spiral CT. Methods 1 200 symptom-free volunteers were under low-dose spiral CT scans in an on-going screening study. The people tested aged 40 or older regardless of their gender or smoking history. Low-dose CT scans were performed with Iightspeed Plus multi-slice scanner using spiral mode, 120 kV,30 mAs. Results Calcified nodules were detected in 32 participants and non-calcified nodules were detected in 18 participants by low-dose CT,in which 3 were vicious ones,including 1 non-solid lesion and 2 solid lesions. The detection rate of lung cancer was 0. 25%. Conclusion Low-dose multi-slice spiral CT was effective in detecting, classifying and defining lung nodules,and furthermore would make it possible to find lung cancer at earlier stage.

Piperazine drugs, N - benzyl piperazine (BZP), 1 - (3 - chlorobenzene) piperazine (mCPP), 1 - (3 - three lfuorinated methyl phenyl) piperazine (TFMPP) have excitation and hallucinogenic effects similar to MDMA. They have became the alternative LSDs, abuse of substitues in the world reported increased year by year. The paper reviewed three piperazines regulation, abuse, toxicology, detection methods, and hope to provide a reference for judicial departments to crack down on the crime of the drug uses.