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Intracranial area: a validated method for estimating intracranial volume
Karen J Ferguson1, Joanna M Wardlaw, C Louise Edmond
1Division of Clinical Neurosciences, University of Edinburgh, Western General Hospital, Edinburgh, UK.
Summary
Estimating intracranial volume (ICV) is vital for brain imaging. A new, rapid method using a single mid-sagittal slice (intracranial cross-sectional area) provides a valid and reliable ICV estimate.
Area of Science:
- Neuroimaging
- Radiology
- Biomedical Engineering
Background:
- Accurate intracranial volume (ICV) measurement is essential for magnetic resonance imaging (MRI) studies analyzing brain volume changes.
- Current methods for precise ICV quantification are time-consuming and complex.
- There is a need for simpler, validated techniques for estimating ICV.
Purpose of the Study:
- To develop and validate a novel method for estimating intracranial volume (ICV) using a single mid-sagittal slice.
- To assess the reliability and validity of using intracranial cross-sectional area (ICSA) for ICV estimation.
Main Methods:
- Forty men aged 65-70 underwent 1.9 T whole-skull MRI with 1.5 mm slice thickness.
- Intracranial cross-sectional area (ICSA) was measured from the midline sagittal slice.
- Intracranial volume (ICV) was calculated using all slices for comparison.
- Interrater reliability of ICSA measurements was assessed.
Main Results:
- A strong correlation was observed between intracranial cross-sectional area (ICSA) and intracranial volume (ICV) (r = .88, P < .0001).
- Bland-Altman analysis indicated good agreement between the two measurement methods.
- The intraclass correlation for ICSA measurements demonstrated high reliability (r = .976, P < .005).
Conclusions:
- The proposed intracranial cross-sectional area (ICSA) measurement is a rapid and straightforward technique.
- ICSA provides a valid and reliable estimation of intracranial volume (ICV).
- This method offers a practical alternative for ICV assessment in MRI studies.