Study of Radiotracer [18F]Fluortriopride ([18F]FTP) by PET/CT

Inclusion Criteria: 1. Participants will be ≥ 18 years of age 2. "Healthy volunteer" is defined as being in good general health in the opinion of an investigator (controlled diabetes, controlled hypertension or other well controlled chronic medical conditions may be allowed at the discretion of an investigator if they do not believe they will increase patient risk or interfere with the collection of imaging data, specific excluded conditions are described under exclusion criteria) 3. Participants must be informed of the investigational nature of this study and provide written informed consent in accordance with institutional and federal guidelines prior to study-specific procedures. Exclusion Criteria: 1. Females who are pregnant at the time of screening will not be eligible for this study, urine or blood pregnancy test will be performed in women of child-bearing potential at screening. 2. Body Mass Index (BMI) \> 35 3. Sustained uncontrolled hypertension (Systolic blood pressure greater than 160 mm Hg and/or diastolic blood pressure greater than 110 mm Hg) at screening intake session. If either of the pressure values is above the stated limits on the initial assessment, blood pressure may be re-tested twice after initial assessment at five minute intervals (for a total of 3 blood pressure assessments). The pressure elevation is considered sustained if either the systolic or diastolic pressure values are outside the stated limits for all three assessments, and the subject will be excluded from study participation. 4. History of epilepsy or seizure disorder as assessed by medical record review and/or self-reported 5. History of head trauma, that in the opinion of an investigator may interfere with the uptake of \[18F\]FTP as assessed by medical record review and/or self-reported 6. History of Post-Traumatic Stress Disorder (PTSD), bipolar disorder, schizophrenia or psychotic disorder as assessed by medical record review and/or self-reported 7. Use of dopaminergic CNS stimulants (prescription, over-the counter or recreational drugs) within 30 days of screening intake visit , as assessed by review of health history form and concomitant medication review at screening intake visit (from medical record and/or self-reported) that are deemed by a physician investigator to have a potential influence on the binding of \[18F\]FTP 8. Positive urine drug screen at the screening intake visit 9. Self-reported current alcohol consumption that exceeds greater than 25 drinks per week 10. Any current medical condition, illness, or disorder as assessed by medical record review and/or self-reported that is considered by a physician investigator to be a condition that could compromise participant safety or successful participation in the study 11. Unwilling or unable to provide informed consent