Related Experiment Video
Updated: May 27, 2026
Hybrid PET/MRI Imaging of Alzheimer's Disease Based on 18F-AV-1451
Published on: April 18, 2025
Voxel-level comparison of arterial spin-labeled perfusion MRI and FDG-PET in Alzheimer disease
1Department of Neurology, University of Pennsylvania, 3W Gates Pavilion, 3400 Spruce St., Philadelphia, PA 19104, USA.
Objective:
We compared the ability of arterial spin labeling (ASL), an MRI method that measures cerebral blood flow (CBF), to that of FDG-PET in distinguishing patients with Alzheimer disease (AD) from healthy, age-matched controls.
Methods:
Fifteen patients with AD (mean age 72 ± 6 years, Mini-Mental State Examination score [MMSE] 20 ± 6) and 19 age-matched controls (mean age 68 ± 6 years, MMSE 29 ± 1) underwent structural MRI. Participants were injected with 5 mCi of FDG during pseudocontinuous ASL scan, which was followed by PET scanning. Statistical parametric mapping and regions of interest (ROI) analysis were used to compare the ability of the 2 modalities in distinguishing patients from controls. Similarity between the 2 modalities was further assessed with linear correlation maps of CBF and metabolism to neuropsychological test scores.
Results:
Good agreement between hypoperfusion and hypometabolism patterns was observed, with overlap primarily in bilateral angular gyri and posterior cingulate. ROI results showed similar scales of functional deficit between patients and controls in both modalities. Both ASL and FDG-PET were able to distinguish neural networks associated with different neuropsychological tests with good overlap between modalities.
Conclusions:
Our voxel-wise results indicated that ASL-MRI provides largely overlapping information with FDG-PET. ROI analysis demonstrated that both modalities detected similar degrees of functional deficits in affected areas. Given its ease of acquisition and noninvasiveness, ASL-MRI may be an appealing alternative for AD studies.
Insights
Arterial spin labeling MRI (ASL-MRI) shows similar results to FDG-PET in detecting brain changes in Alzheimer disease (AD). ASL-MRI is a promising, non-invasive alternative for AD research due to its ease of use.
Area of Science:
- Neuroimaging
- Radiology
- Neurology
Background:
- Alzheimer disease (AD) diagnosis relies on identifying characteristic patterns of brain dysfunction.
- Cerebral blood flow (CBF) and glucose metabolism are key indicators of neuronal activity.
- Distinguishing AD patients from healthy controls is crucial for research and clinical assessment.
Purpose of the Study:
- To compare the efficacy of Arterial Spin Labeling Magnetic Resonance Imaging (ASL-MRI) with Fluorodeoxyglucose Positron Emission Tomography (FDG-PET) in identifying AD-related brain changes.
- To assess the concordance between ASL-MRI and FDG-PET in detecting functional deficits in patients with AD.
Main Methods:
- Fifteen AD patients and 19 age-matched controls underwent structural MRI, ASL scan, and FDG-PET scan.
- Voxel-wise statistical parametric mapping and region of interest (ROI) analyses were employed.
- Correlation analysis linked CBF and metabolism data with neuropsychological test scores.
Main Results:
- ASL-MRI and FDG-PET demonstrated good agreement in identifying patterns of hypoperfusion and hypometabolism, particularly in the bilateral angular gyri and posterior cingulate.
- Both modalities revealed similar magnitudes of functional deficits in AD patients compared to controls.
- ASL-MRI and FDG-PET effectively distinguished neural networks associated with neuropsychological tests, showing significant overlap.
Conclusions:
- ASL-MRI provides largely overlapping diagnostic information compared to FDG-PET in Alzheimer disease.
- Both imaging techniques detect comparable degrees of functional deficits in affected brain regions.
- ASL-MRI presents a potentially valuable and less invasive alternative for Alzheimer disease research and potentially diagnosis.
