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Showing 1–15 of 15 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: O-15 Radioisotope Clear all
Completed No phase listed Observational Accepts healthy volunteers

Effects of Drugs on Cerebral Blood Flow in Patients With Mood Disorders

NCT00001478
View directory record Official record
Conditions
Healthy, Mood Disorders
Interventions
Not listed
Lead sponsor
National Institute of Mental Health (NIMH)
NIH
Eligibility
Not listed
Enrollment
170 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1994 – 2001
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 25, 2026, 5:22 AM EDT
Withdrawn Not applicable Interventional Accepts healthy volunteers

Comparison of Quantitative MRI Perfusion Methods With Quantitative PET Perfusion Imaging

NCT02608944
View directory record Official record
Conditions
MRI Scans
Interventions
Adenosine, Regadenoson, O-15 labeled radioactive water, MRI, PET Imaging
Drug · Device
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Healthy volunteers
Accepts healthy volunteers
Timeline
2012 – 2019
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Sep 13, 2020 · Synced Sep 25, 2026, 5:22 AM EDT
Recruiting Early Phase 1 Interventional Accepts healthy volunteers

New MRI Methods Applied to Heart Failure With Preserved Ejection Fraction (HFpEF)

NCT04600115
View directory record Official record
Conditions
MRI Scans
Interventions
Adenosine, Regadenoson, O-15 labeled radioactive water, MRI, PET Imaging
Drug · Device
Lead sponsor
University of Utah
Other
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2027
U.S. locations
1
States / cities
Salt Lake City, Utah
Source: ClinicalTrials.gov public record
Updated Jul 6, 2026 · Synced Sep 25, 2026, 5:22 AM EDT
Completed Phase 3 Interventional Results available

Non-Invasive Vagal Nerve Stimulation in Opioid Use Disorders

NCT04556552
View directory record Official record
Conditions
Substance-Related Disorders, Substance Use Disorders, Substance Abuse, Intravenous, Substance Withdrawal, Substance Abuse, Opioid-use Disorder, Opioid Use Disorder, Severe, Opioid Use
Interventions
Non invasive VN stimulation (nVNS), Oxygen (15-O) Water, Sham Stimulation
Device · Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years to 80 Years
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2022
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Sep 12, 2023 · Synced Sep 25, 2026, 5:22 AM EDT
Completed No phase listed Observational

Protein Synthesis in the Brain of Patients With Fragile X Syndrome

NCT00362843
View directory record Official record
Conditions
Fragile X Syndrome, Healthy Volunteers
Interventions
[15-O]water
Drug
Lead sponsor
National Institute of Mental Health (NIMH)
NIH
Eligibility
18 Years to 24 Years · Male only
Enrollment
147 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2020
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Oct 7, 2024 · Synced Sep 25, 2026, 5:22 AM EDT
Active, not recruiting Phase 3 Interventional

RAdiolabeled Perfusion to Identify Coronary Artery Disease Using WAter To Evaluate Responses of Myocardial FLOW (RAPID-WATER-FLOW)

NCT05134012
View directory record Official record
Conditions
Coronary Artery Disease
Interventions
[O-15]-Water PET Myocardial Perfusion Imaging (MPI)
Drug
Lead sponsor
MedTrace Pharma A/S
Industry
Eligibility
18 Years and older
Enrollment
215 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
6
States / cities
Iowa City, Iowa • Rochester, Minnesota • St Louis, Missouri + 3 more
Source: ClinicalTrials.gov public record
Updated Aug 9, 2026 · Synced Sep 25, 2026, 5:22 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Positron Emission Tomography to Measure Pain and Pain Control

NCT00001307
View directory record Official record
Conditions
Healthy, Hyperalgesia, Pain, Peripheral Nervous System Disease
Interventions
Oxygen-15 Water, Capsaicin
Drug
Lead sponsor
National Institute of Dental and Craniofacial Research (NIDCR)
NIH
Eligibility
Not listed
Enrollment
273 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1992 – 2005
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 25, 2026, 5:22 AM EDT
Recruiting No phase listed Observational

Registering Genomics and Imaging of Tumors (ReGIT)

NCT05386043
View directory record Official record
Conditions
Glioma
Interventions
FET F-18, O-15 Radioisotope, CT scan, MRI with gadolinium-based contrast, Biopsy Collection
Drug · Procedure
Lead sponsor
Indiana University
Other
Eligibility
18 Years and older
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2032
U.S. locations
1
States / cities
Indianapolis, Indiana
Source: ClinicalTrials.gov public record
Updated Sep 14, 2025 · Synced Sep 25, 2026, 5:22 AM EDT
Completed No phase listed Observational

Use of Repetitive Transcranial Magnetic Stimulation (rTMS) in Chronic Posttraumatic Stress Disorder (PTSD)

NCT00001657
View directory record Official record
Conditions
Posttraumatic Stress Disorder
Interventions
Not listed
Lead sponsor
National Institute of Mental Health (NIMH)
NIH
Eligibility
Not listed
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1997 – 2000
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 25, 2026, 5:22 AM EDT
Completed No phase listed Observational

Studies of Frontal Lobe Brain Functioning in Schizophrenia

NCT00001258
View directory record Official record
Conditions
Healthy Subjects, Schizophrenia, Parkinson Disease
Interventions
Oxygen-15 Water
Drug
Lead sponsor
National Institute of Mental Health (NIMH)
NIH
Eligibility
18 Years to 90 Years
Enrollment
1,039 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 1993
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Aug 11, 2026 · Synced Sep 25, 2026, 5:22 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

PET Scan of Brain Metabolism in Relation to Age and Disease

NCT00001972
View directory record Official record
Conditions
Alzheimer's Disease, Brain Neoplasm, Niemann Pick Disease
Interventions
15 O Water
Drug
Lead sponsor
National Institute of Neurological Disorders and Stroke (NINDS)
NIH
Eligibility
Not listed
Enrollment
123 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1994 – 2002
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 25, 2026, 5:22 AM EDT
Completed Phase 2 Interventional Results available

17AAG to Treat Kidney Tumors in Von Hippel-Lindau Disease

NCT00088374
View directory record Official record
Conditions
Hippel-Lindau Disease, Kidney Cancer
Interventions
17 allylamino-17-demethoxygeldanamycin, 18 FDG (Fludeoxyglucose 18F), [15-O] H2O, EPL diluent
Drug
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years and older
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2004 – 2009
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Jul 26, 2012 · Synced Sep 25, 2026, 5:22 AM EDT
Completed No phase listed Observational Accepts healthy volunteers

Brain Blood Flow Studies of Language and Memory

NCT00001288
View directory record Official record
Conditions
Cerebrovascular Disorder, Epilepsy
Interventions
15 O Water, FDG
Drug
Lead sponsor
National Institute of Neurological Disorders and Stroke (NINDS)
NIH
Eligibility
Not listed
Enrollment
303 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
1991 – 2003
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 25, 2026, 5:22 AM EDT
Completed Phase 3 Interventional Results available

Closed Loop Vagal Nerve Stimulation for Patients With Posttraumatic Stress Disorder

NCT02992899
View directory record Official record
Conditions
PostTraumatic Stress Disorder
Interventions
GammaCore/electroCore non-invasive VNS device, Sham gammaCore/electroCore, O-15 water
Device · Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years to 70 Years
Enrollment
56 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jun 13, 2021 · Synced Sep 25, 2026, 5:22 AM EDT
Completed Phase 1 Interventional

Positron Emission Tomography and Magnetic Resonance Imaging to Evaluate Synovial Blood Flow in Rheumatoid Arthritis Patients

NCT00014794
View directory record Official record
Conditions
Rheumatoid Arthritis
Interventions
15-O labeled water
Drug
Lead sponsor
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
NIH
Eligibility
Not listed
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2003
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 25, 2026, 5:22 AM EDT