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Meyer's loop tractography for image-guided surgery depends on imaging protocol and hardware.
Maxime Chamberland1, Chantal M W Tax1, Derek K Jones2
1Cardiff University Brain Research Imaging Centre (CUBRIC), School of Psychology, Cardiff University, Cardiff, United Kingdom.
Neuroimage. Clinical
|August 22, 2018
Summary
Diffusion MRI data acquisition variations significantly impact optic radiation (OR) tractography, affecting Meyer's loop reconstruction. This variance can lead to under-estimation of OR location in neurosurgical planning.
Area of Science:
- Neuroimaging
- Neurosurgery
- Epilepsy Surgery
Background:
- Surgical resection for temporal lobe epilepsy can cause visual field defects.
- Accurate localization of Meyer's loop (anterior optic radiation) is crucial for minimizing surgical complications.
- Diffusion MRI tractography is increasingly used for image-guided neurosurgery.
Purpose of the Study:
- To investigate the impact of varying diffusion MRI data acquisition protocols on Meyer's loop reconstruction.
- To quantify the discrepancies in optic radiation (OR) tractography caused by differences in image acquisition.
Main Methods:
- Diffusion MRI data were acquired from 13 healthy subjects on three scanners with different maximum gradient amplitudes.
- Standard and state-of-the-art acquisition protocols were employed.
- Meyer's loop was reconstructed, and its distance to the temporal pole (ML-TP) was compared across protocols.
Main Results:
- Significant effects of data acquisition on ML-TP distance were observed between protocols (p < .01 to 0.0001).
- The largest inter-acquisition discrepancy for ML-TP in a single subject was 16.5 mm (mean: 9.4 mm).
Conclusions:
- Variance in diffusion MRI data acquisition leads to substantive variance in optic radiation (OR) tractography.
- This variability has direct implications for neurosurgical planning, potentially leading to under-estimation of OR location with conventional protocols.