A Study of XTR004 Radiotracer in Healthy Volunteers

Inclusion Criteria: 1. Chinese men and women are included age between 18-40 years 2. Normal vital signs and physical examination 3. No clinical abnormalities in ECG, EEG, and echocardiogram 4. No past history of cardiovascular, cerebrovascular, or gastrointestinal diseases 5. Normal or no clinical significance abnormalities in laboratory tests 6. No any other major or chronic illness 7. No presence of drug use 8. Females adopt effective medically approved contraceptive methods to prevent pregnancy for at least 6 months before the study and after the study 9. Voluntarily agree and signed written consent Exclusion Criteria: 1. Previous history of cardiovascular diseases 2. A history of or physical or radiographic manifestations of any previous brain disease 3. Any previous major disease or unstable condition 4. Subjects who cannot complete XTR004 imaging as required 5. Positive HIV, hepatitis C or Treponema pallidum antibody and hepatitis B surface antigen detection 6. A history of coagulation or coagulation disorder 7. A history of liver or gastrointestinal disease or other conditions that interfere with drug absorption, distribution, excretion or metabolism as determined by the investigator 8. Previous history of cancer 9. High risk of drug allergic reaction 10. A history of alcohol or drug abuse/dependence 11. Exposure to significant occupational radiation (e.g \>50 mvs/year) or exposure to radioactive substances for therapeutic or research purposes over the past 10 years 12. Scheduled surgery or other invasive interventions within one week before drug injection 13. Subjects use any drug or treatment that may interfere with the experimental data or cause serious side effects, as determined by the investigator 14. Pregnant or lactating women 15. Admitted to hospital due to illness during screening period Other conditions that investigators consider inappropriate to participate in a trial.