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Methods for normalization of hippocampal volumes measured with MR
S L Free1, P S Bergin, D R Fish
1Institute of Neurology, London, United Kingdom.
AJNR. American Journal of Neuroradiology
|April 1, 1995
Summary
Correction methods normalize hippocampal volumes, aiding in the detection of subtle bilateral hippocampal volume loss in epilepsy patients.
Area of Science:
- Neuroimaging
- Neurology
- Radiology
Background:
- Hippocampal volume is crucial in neurological studies.
- Accurate measurement of hippocampal volume is essential for diagnosing conditions like epilepsy.
- Existing methods may not fully account for individual variations.
Purpose of the Study:
- To evaluate cerebral measures for normalizing hippocampal volumes.
- To establish reliable correction processes for absolute hippocampal volume calculation.
- To identify potential markers for hippocampal volume abnormalities.
Main Methods:
- Magnetic resonance imaging (MRI) was used to estimate hippocampal volumes and six cerebral measures in control subjects.
- Regression analysis explored the relationship between hippocampal volume and cranial/cerebral measures.
- Two correction processes (division and covariance) were applied to determine normalized hippocampal volumes.
Main Results:
- Correction methods significantly reduced variance in hippocampal volumes among controls.
- Abnormally small absolute hippocampal volumes could be identified post-correction.
- In epilepsy patients, correction identified bilateral hippocampal volume loss in some cases with normal volume ratios.
Conclusions:
- Normalized hippocampal volumes can be reliably determined using correction processes.
- These methods enhance the identification of hippocampal volume loss, including unsuspected bilateral cases.
- This approach is valuable for correlation studies and clinical diagnostics in neurological disorders.