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BMC Neurology

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Open Access 01-12-2019 | Epilepsy | Research article

Automatic labeling of the fanning and curving shape of Meyer’s loop for epilepsy surgery: an atlas extracted from high-definition fiber tractography

Authors: Yong-Zhi Shan, Zhen-Ming Wang, Xiao-Tong Fan, Hua-Qiang Zhang, Lian-Kun Ren, Peng-Hu Wei, Guo-Guang Zhao

Published in: BMC Neurology | Issue 1/2019

Abstract

Background

Visual field defects caused by injury to Meyer’s loop (ML) are common in patients undergoing anterior temporal lobectomy during epilepsy surgery. Evaluation of the anatomical shapes of the curving, fanning and sharp angles of ML to guide surgeries is important but still challenging for diffusion tensor imaging. We present an advanced diffusion data-based ML atlas and labeling protocol to reproduce anatomical features in individuals within a short time.

Methods

Thirty Massachusetts General Hospital-Human Connectome Project (MGH-HCP) diffusion datasets (ultra-high magnetic gradient & 512 directions) were warped to standard space. The resulting fibers were projected together to create an atlas. The anatomical features and the tractography correspondence rates were evaluated in 30 MGH-HCP individuals and local diffusion spectrum imaging data (eight healthy subjects and six hippocampal sclerosis patients).

Results

In the atlas, features of curves, sharp angles and fanning shapes were adequately reproduced. The distances from the anterior tip of the temporal lobe to the anterior ridge of Meyer’s loop were 23.1 mm and 26.41 mm on the left and right sides, respectively. The upper and lower divisions of the ML were revealed to be twisting. Eighty-eight labeled sides were achieved, and the correspondence rates were 87.44% ± 6.92, 80.81 ± 10.62 and 72.83% ± 14.03% for MGH-HCP individuals, DSI-healthy individuals and DSI-patients, respectively.

Conclusion

Atlas-labeled ML is comparable to high angular resolution tractography in healthy or hippocampal sclerosis patients. Therefore, rapid identification of the ML location with a single modality of T1 is practical. This protocol would facilitate functional studies and visual field protection during neurosurgery.

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Title: Automatic labeling of the fanning and curving shape of Meyer’s loop for epilepsy surgery: an atlas extracted from high-definition fiber tractography
Authors: Yong-Zhi Shan
Zhen-Ming Wang
Xiao-Tong Fan
Hua-Qiang Zhang
Lian-Kun Ren
Peng-Hu Wei
Guo-Guang Zhao
Publication date: 01-12-2019
Publisher: BioMed Central
Keyword: Epilepsy
Published in: BMC Neurology / Issue 1/2019
Electronic ISSN: 1471-2377
DOI: https://doi.org/10.1186/s12883-019-1537-6

At a glance: The STEP trials

Springer Medicine

Automatic labeling of the fanning and curving shape of Meyer’s loop for epilepsy surgery: an atlas extracted from high-definition fiber tractography

Abstract

Background

Methods

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Background

Methods

Results

Conclusion

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