Visual rating versus volumetry to detect frontotemporal dementia
1Department of Medicine (Division of Neurology), University of Toronto, Ont., Canada. tchow @ rotman-baycrest.on.ca
Dementia and Geriatric Cognitive Disorders
|June 1, 2011
Summary
Visual assessment of MRI-defined atrophy in frontotemporal dementia (FTD) did not reliably distinguish between FTD and Alzheimer's disease (AD) in a clinical setting. Clinicians agreed on atrophy presence but lacked diagnostic accuracy.
Area of Science:
- Neuroimaging
- Neurology
- Dementia Research
Background:
- Automated volumetric MRI analysis can identify atrophy in left anterior cingulate (LAC) and anterior temporal (LAT) regions, distinguishing frontotemporal dementia (FTD) from controls.
- Differences in anterior temporal atrophy exist between FTD and Alzheimer's disease (AD).
Purpose of the Study:
- To investigate if clinicians can visually detect MRI-defined atrophy patterns in LAC and LAT regions.
- To assess if visual atrophy detection can accurately classify patients with FTD versus AD.
Main Methods:
- Four neurologists visually assessed MRI slices for atrophy in LAC and LAT regions.
- Participants included 21 FTD, 21 controls, and 14 AD patients.
- Inter-rater reliability and diagnostic accuracy were evaluated.
Main Results:
- All raters agreed on the presence of clinically significant atrophy.
- Individual atrophy scoring correlated with volumetric data.
- High inter-rater diagnostic agreement was not achieved.
Conclusions:
- Visual assessment of volumetric atrophy patterns is challenging to implement in routine clinical practice.
- Translating automated volumetric findings into reliable visual diagnostic criteria requires further refinement.
