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Updated: Oct 27, 2025
A Comprehensive Protocol for Manual Segmentation of the Medial Temporal Lobe Structures
Published on: July 2, 2014
Validity and reliability of the medial temporal lobe atrophy scale in a memory clinic population
Anna Molinder1,2, Doerthe Ziegelitz3, Stephan E Maier3,4
1Department of Radiology, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden. anna.molinder@vgregion.se.
Background:
Visual rating of medial temporal lobe atrophy (MTA) is often performed in conjunction with dementia workup. Most prior studies involved patients with known or probable Alzheimer's disease (AD). This study investigated the validity and reliability of MTA in a memory clinic population.
Methods:
MTA was rated in 752 MRI examinations, of which 105 were performed in cognitively healthy participants (CH), 184 in participants with subjective cognitive impairment, 249 in subjects with mild cognitive impairment, and 214 in patients with dementia, including AD, subcortical vascular dementia and mixed dementia. Hippocampal volumes, measured manually or using FreeSurfer, were available in the majority of cases. Intra- and interrater reliability was tested using Cohen's weighted kappa. Correlation between MTA and quantitative hippocampal measurements was ascertained with Spearman's rank correlation coefficient. Moreover, diagnostic ability of MTA was assessed with receiver operating characteristic (ROC) analysis and suitable, age-dependent MTA thresholds were determined.
Results:
Rater agreement was moderate to substantial. MTA correlation with quantitative volumetric methods ranged from -0.20 (p< 0.05) to -0.68 (p < 0.001) depending on the quantitative method used. Both MTA and FreeSurfer are able to distinguish dementia subgroups from CH. Suggested age-dependent MTA thresholds are 1 for the age group below 75 years and 1.5 for the age group 75 years and older.
Conclusions:
MTA can be considered a valid marker of medial temporal lobe atrophy and may thus be valuable in the assessment of patients with cognitive impairment, even in a heterogeneous patient population.
Insights
Visual rating of medial temporal lobe atrophy (MTA) is a valid tool for assessing cognitive impairment in memory clinic patients. Age-dependent thresholds improve diagnostic accuracy for dementia, even in mixed cases.
Area of Science:
- Neurology
- Radiology
- Geriatrics
Background:
- Medial temporal lobe atrophy (MTA) visual rating is common in dementia workups, but prior studies focused on Alzheimer's disease (AD).
- This research examines MTA validity and reliability within a diverse memory clinic population.
Purpose of the Study:
- To assess the validity and reliability of visual MTA ratings in a memory clinic setting.
- To determine the diagnostic performance of MTA in distinguishing various cognitive impairment groups.
Main Methods:
- 752 MRI scans were analyzed, including cognitively healthy (CH), subjective cognitive impairment, mild cognitive impairment, and dementia groups.
- Intra- and interrater reliability were assessed using Cohen's kappa; correlations with hippocampal volumes were determined via Spearman's coefficient.
- Receiver operating characteristic (ROC) analysis identified age-dependent MTA thresholds for diagnostic accuracy.
Main Results:
- Moderate to substantial rater agreement was observed for MTA.
- MTA showed significant correlations with quantitative hippocampal volumes (r = -0.20 to -0.68).
- MTA and FreeSurfer effectively differentiated dementia subgroups from CH; proposed age-dependent thresholds are 1 (age < 75) and 1.5 (age ≥ 75).
Conclusions:
- Visual MTA rating is a valid biomarker for medial temporal lobe atrophy.
- MTA is valuable for assessing patients with cognitive impairment in heterogeneous populations.
- Age-specific MTA thresholds enhance diagnostic utility in memory clinics.
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