Diffusion Tensor Tractography of the Meyer Loop in Cases of Temporal Lobe Resection for Temporal Lobe Epilepsy: Correlation between Postsurgical Visual Field Defect and Anterior Limit of Meyer Loop on Tractography

Taoka, Toshiaki; Sakamoto, Masahiko; Nakagawa, Hiroyuki; Nakase, Hiroyuki; Iwasaki, Shigeo; Takayama, K.; Taoka, Keiko; Hoshida, Tohru; Sakaki, Toshisuke; Kichikawa, Kimihiko

doi:10.3174/ajnr.a1101

Cited by 89 publications

(71 citation statements)

References 17 publications

(22 reference statements)

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“…Contrary to the results reported by Taoka et al (2008) our group observed significant differences between the left and right ML-UF distance measurements, with shorter gaps between the left ML-UF (mean = 6.73mm) and longer gaps between the right ML-UF (mean = 14.18mm) tracts. Figure 2 provides examples of left (Figure 2a and b) and rightward ( Figure 2d) ML-UF asymmetry and more symmetric ML-UF distances ( Figure 2c), in three representative subjects.…”

Section: Ml-uf Distancecontrasting

confidence: 99%

“…Taoka et al (2008) used tractography of the UF and proposed that the UF is located "just anterior" to the most anterior tip of ML and can thus be used to better delineate its most anterior point. Fifty percent of his patients did not demonstrate a gap between the posterior limit of the UF and the anterior limit of ML and none of the patients showed an ML-UF distance greater than 4mm.…”

Section: Ml-uf Distancementioning

confidence: 99%

“…One of the most common complications of temporal lobe epilepsy (TLE) surgery is a partial or complete superior homonymous quadrantanopia (Chen et al, 2009;Jeelani et al, 2010;Jensen, 1976;Marino, 1968;Taoka et al, 2008;Van Buren, 1958;Yeni et al, 2008;Yogarajah et al, 2009). This defect is due to the disruption of the anterior bundle of the optic radiation (OR) commonly known as Meyer's Loop (ML) (Meyer 1907).…”

Section: Introductionmentioning

confidence: 99%

“…By contrast, ML curves forward first, loops toward the tip of the temporal horn (TH) and turns sharply to project posteriorly to carry visual input from the upper field to the region below the calcarine fissure. It is this particular temporal-anterior trajectory that demonstrates notable anatomical variability across individuals and thus poses challenges for TLE surgery and the minimization of neurological deficit (Chen et al, 2009; Ebeling M a n u s c r i p t and Reulen,1988;Jeelani et al, 2010;Taoka et al, 2008;Yeni et al, 2008;Yogarajah et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Although there are a number of dissection studies (Burgel et al, 1999;Ebeling and Reulen 1988;Kier et al, 2004;Rubino et al, 2005;Sincoff et al, 2004) and tractography (Chen et al, 2009;Choi et al, 2006;Nilsson et al, 2007Nilsson et al, , 2010Sherbondy et al, 2008;Taoka et al, 2008;Yamamoto et al, 2005Yamamoto et al, , 2007Yogarajah et al, 2009;Wang et al, 2010;Winston et al, 2012) that have explored the anatomy of ML, there is considerable variability in reports of the exact location, trajectory, volume and hemispheric asymmetry of the tract. For example, in dissection studies the distance of the most anterior extent of ML to the temporal pole (ML-TP) is usually shorter compared M a n u s c r i p t to tractography studies.…”

Section: Introductionmentioning

confidence: 99%

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Tractography of Meyer's Loop asymmetries

et al. 2014

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Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Tractography of meyer's loop asymmetries NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21272153&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21272153&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions?Contact the NRC Publications Archive team at PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1016/j.eplepsyres.2014.03.006Epilepsy Research, 108, 5, pp. 872-882, 2014 Accepted Manuscript This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A c c e p t e d M a n u s c r i p t ABSTRACT Purpose:The purpose of the current study was to use diffusion tensor imaging (DTI) to conduct tractography of the optic radiations (OR) and its component bundles and to assess both the degree of hemispheric asymmetry and the inter-subject variability ofMeyer's Loop (ML). We hypothesized that there are significant left versus right differences in the anterior extent of ML to the temporal pole (TP) in healthy subjects.Materials and Methods: DTI data were acquired on a 3T Siemens MRI system using a single-shot Spin Echo EPI sequence. The dorsal, central and ML bundles of the OR were tracked and visualized in forty hemispheres of twenty healthy volunteers. The uncinate fasciculus (UF) was also tracked in these subjects so that it could be used as a distinct anatomical reference. Measurements were derived for the distance between ML-TP, ML and the temporal horn (ML-TH) and ML and...

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Section: Ml-uf Distancecontrasting

confidence: 99%

Section: Ml-uf Distancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tractography of Meyer's Loop asymmetries

et al. 2014

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Optimization of tractography of the optic radiations

Benjamin

Singh

Prabhu

et al. 2012

Human Brain Mapping

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Imaging and delineation of the optic radiations (OpR) remains challenging, despite repeated attempts to achieve reliable validated tractography of this complex structure. Previous studies have used varying methods to generate representations of the OpR which differ markedly from one another and, frequently, from the OpR’s known structure. We systematically examined the influence of a key variable that has differed across previous studies, the tractography seed region, in 13 adult participants (9 male; mean age 31 years; sd. 8.7 years; range 16–47). First we compared six seed regions at the lateral geniculate nucleus (LGN) and sagittal stratum based on the literature and known OpR anatomy. Three of the LGN regions seeded streamlines consistent with the OpR’s three ‘bundles’ while a fourth seeded streamlines consistent with each of the three bundles. The remaining two generated OpR streamlines unreliably and inconsistently. Two stratum regions seeded the radiations. This analysis identified a set of optimal ROI for seeding OpR tractography and important inclusion and exclusion ROI. An optimized approach was then used to seed LGN regions to the stratum. The radiations, including streamlines consistent with Meyer’s Loop, were streamlined in all cases. Streamlines extended 0.2±2.4mm anterior to the tip of the anterior horn of the lateral ventricle. These data suggest some existing approaches likely seed representations of the OpR that are visually plausible but do not capture all OpR components, and that using an optimized combination of regions seeded previously allows optimal mapping of this complex structure.

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Tractography of the optic radiation: a repeatability and reproducibility study

Dayan¹,

Kreutzer

Clark³

2015

NMR Biomed.

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Our main objective was to evaluate the repeatability and reproducibility of optic radiation (OR) reconstruction from diffusion MRI (dMRI) data. 14 adults were scanned twice with the same 60-direction dMRI sequence. Peaks in the diffusion profile were estimated with the single tensor (ST), Q-ball (QSH) and persistent angular structure (PAS) methods. Segmentation of the OR was performed by two experimenters with probabilistic tractography based on a manually drawn region-of-interest (ROI) protocol typically employed for OR segmentation, with both standard and extended sets of ROIs. The repeatability and reproducibility were assessed by calculating the intra-class correlation coefficient (ICC) of intra- and inter-rater experiments, respectively. ICCs were calculated for commonly used dMRI metrics (FA, MD, AD, RD) and anatomical dimensions of the optic radiation (distance from Meyer's loop to the temporal pole, ML-TP), as well as the Dice similarity coefficient (DSC) between the raters' OR segmentation. Bland-Altman plots were also calculated to investigate bias and variability in the reproducibility measurements. The OR was successfully reconstructed in all subjects by both raters. The ICC was found to be in the good to excellent range for both repeatability and reproducibility of the dMRI metrics, DSC and ML-TP distance. The Bland-Altman plots did not show any apparent systematic bias for any quantities. Overall, higher ICC values were found for the multi-fiber methods, QSH and PAS, and for the standard set of ROIs. Considering the good to excellent repeatability and reproducibility of all the quantities investigated, these findings support the use of multi-fiber OR reconstruction with a limited number of manually drawn ROIs in clinical applications utilizing either OR microstructure characterization or OR dimensions, as is the case in neurosurgical planning for temporal lobectomy.

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Diffusion Tensor Tractography of the Meyer Loop in Cases of Temporal Lobe Resection for Temporal Lobe Epilepsy: Correlation between Postsurgical Visual Field Defect and Anterior Limit of Meyer Loop on Tractography

Cited by 89 publications

References 17 publications

Tractography of Meyer's Loop asymmetries

Tractography of Meyer's Loop asymmetries

Optimization of tractography of the optic radiations

Tractography of the optic radiation: a repeatability and reproducibility study

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