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Thalamus Optimized Multi Atlas Segmentation (THOMAS): fast, fully automated segmentation of thalamic nuclei from
Jason H Su1, Francis T Thomas2, Willard S Kasoff3
1Electrical Engineering, Stanford University, Stanford, CA, USA.
Neuroimage
|March 22, 2019
Summary
A new MRI method, THOMAS, accurately segments thalamic nuclei in under 15 minutes. This technique aids in diagnosing neurological disorders and guiding brain surgery by precisely mapping thalamic structures.
Area of Science:
- Neuroimaging
- Radiology
- Medical Image Analysis
Background:
- Standard MRI struggles to differentiate thalamic nuclei.
- Existing diffusion tensor imaging methods for thalamic segmentation have limitations in spatial resolution and distortion.
- Accurate segmentation of thalamic nuclei is crucial for research and clinical applications.
Purpose of the Study:
- To develop and validate a novel, fast, and accurate multi-atlas segmentation technique for thalamic nuclei using white-matter-nulled MP-RAGE MRI.
- To assess the segmentation accuracy of the proposed method (THOMAS) against manual delineations and evaluate its utility in clinical settings.
Main Methods:
- Developed THOMAS, a multi-atlas segmentation method using white-matter-nulled MP-RAGE MRI.
- Evaluated THOMAS on 7T MRI data from healthy volunteers and multiple sclerosis patients.
- Compared THOMAS segmentations against manual delineations by a neuroradiologist using Morel atlas guidance.
- Assessed segmentation accuracy using Dice and volume similarity indices.
Main Results:
- THOMAS segments 12 thalamic nuclei with high accuracy (Dice indices ≥ 0.7 for small nuclei, ≥ 0.85 for large nuclei).
- Volume similarity indices ranged from 0.82 to 0.97.
- Significantly lower volumes of specific thalamic nuclei were observed in MS patients compared to controls.
- The method demonstrated potential for targeting the Vim nucleus in neurosurgical procedures.
Conclusions:
- THOMAS provides fast and accurate segmentation of thalamic nuclei directly from structural MRI.
- This method facilitates precise volumetric quantification of thalamic nuclei for tracking neurological disease progression.
- THOMAS enables MRI-guided intraoperative procedures such as thalamotomy and deep brain stimulation electrode placement.
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