This is an open-label whole-body PET/CT (positron emission tomography/computed tomography) study for investigation of radiation dosimetry, plasma pharmacokinetics, biodistribution, safety and diagnostic performance of (S)-[18F]FBFP in healthy volunteers and patients with central nervous system diseases. A single dose of nearly 370 MBq (S)-[18F]FBFP will be intravenously injected into healthy volunteers and patients with central nervous system diseases. Visual and semiquantitative method will be used to assess the PET/CT images. Changes of blood pressure, pulse, respiration, temperature and any adverse events will be collected from the volunteers. Adverse events will also be observed in the patients.

(S)-[18F]FBFP is a promising sigma-1 receptor radioligand. The sigma-1 receptor is a unique chaperone protein with 223 amino acids located at the mitochondria-associated endoplasmic reticulum membrane. Several lines of evidence have demonstrated that the sigma-1 receptor plays a pivotal role in the pathophysiology of many neuropsychiatric disorders including amyotrophic lateral sclerosis, Alzheimer's disease, Parkinson's disease, Huntington's disease, pain, depression and drug addiction.Therefore, it is an important target for the investigation of neuropsychiatric disorders and drug development. PET imaging of sigma-1 receptors in the human brain will enable the elucidation of this target's involvement in neurologic disorders and will also facilitate new drug development.

For further interests in clinical translation of PET sigma-1 receptors radioligands, (S)-[18F]FBFP, an open-label whole-body PET/CT study was designed to investigate radiation dosimetry, plasma pharmacokinetics, biodistribution, safety and diagnostic performance of (S)-[18F]FBFP in healthy volunteers and patients with central nervous system diseases.

Inclusion Criteria:

• Healthy volunteers: Males and females, ≥18 years old
• Patients With Central Nervous System Diseases: Patients with suspicion or diagnosis of central nervous system diseases after systemic neuropsychiatric assessment by experienced neurologists, having other imaging examination like CT or MRI, being able to provide basic information and sign the written informed consent form.

Exclusion Criteria:

• Females planning to bear a child recently or with childbearing potential
• Known severe allergy or hypersensitivity to [18F] radionuclides.
• Kidney or liver failure.
• Patients not able to enter the bore of the PET/CT scanner.
• Inability to lie still for the entire imaging time because of cough, pain, etc.
• Concurrent severe and/or uncontrolled and/or unstable other medical disease that, in the opinion of the Investigator, may significantly interfere with study compliance.