Neurosurgical topography of the optic radiation in the temporal lobe

Ebeling, U.; Reulen, H. J.

doi:10.1007/bf01401969

Cited by 211 publications

(240 citation statements)

References 19 publications

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“…Asymmetry measurements in the current study support our hypothesis and demonstrate that the mean ML-TP distance is significantly shorter in the left (39.70 mm) compared to the right (45.64 mm) temporal lobe (table). The asymmetry of the anterior extent of the OR has been initially discussed in dissection studies (Ebeling and Reulen, 1988), and representative figures of the OR in dissection and tractography studies often depict leftward asymmetry (Govindan et al, 2008;Hofer et al, 2010;Mandelstam 2012;Sherbondy et al, 2008). Consistent with the significant leftward asymmetry of ML-TP in our study, Burgel et al (1999) report significant leftward asymmetries of the LGN and OR in a dissection study of ten adult human brains.…”

Section: Asymmetry Measurementssupporting

confidence: 87%

“…Others have reported ML-TP mean distances of 28mm (Sherbondy et al, 2008) 30mm (Nilsson et al, 2010) and 35mm (Yogarajah et al, 2009) using probabilistic tractography. Probabilistic measures therefore more closely approximate values (≤ 31.4mm) obtained with gold standard dissection techniques (Choi et al 2006, Ebeling andReulen, 1988;Pujari et al, Rubino et al 2005). Probabilistic tractography is less likely to underestimate the anterior extent of ML because it assigns a probability function to multiple local pathway orientations, increasing the ability to track fibre trajectories with a high degree of curvature.…”

Section: Distance Measurementssupporting

confidence: 55%

“…There is general consensus on the individual variability of the exact location, anatomy, course and hemispheric symmetry of ML (Chen et al, 2009;Ebeling andReulen 1988, Mandelstam 2012). Keeping in mind that deterministic tractography has been criticised to overestimate ML-TP distances, the present study is the first to report significant asymmetries in the anterior extent of ML.…”

Section: Discussionmentioning

confidence: 99%

“…In a second step, three additional inclusive target Regions of Interest (ROIs) were placed to separate ML and the central and dorsal bundles (OR-separate bundles). ROIs were selected based on the M a n u s c r i p t correspondence between anatomical knowledge of the separate bundles (Ebeling and Reulen 1988) and their visualization using the ConTrack DTI-FT algorithm (Sherbondy et al, 2008).…”

Section: Region Of Interest Placement For Tractographymentioning

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: Asymmetry Measurementssupporting

confidence: 87%

Section: Distance Measurementssupporting

confidence: 55%

Section: Discussionmentioning

confidence: 99%

Section: Region Of Interest Placement For Tractographymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Tractography of Meyer's Loop asymmetries

et al. 2014

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Optic radiation tractography and vision in anterior temporal lobe resection

Winston

Daga

Stretton

et al. 2012

Annals of Neurology

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ObjectiveAnterior temporal lobe resection (ATLR) is an effective treatment for refractory temporal lobe epilepsy but may result in a contralateral superior visual field deficit (VFD) that precludes driving in the seizure-free patient. Diffusion tensor imaging (DTI) tractography can delineate the optic radiation preoperatively and stratify risk. It would be advantageous to incorporate display of tracts into interventional magnetic resonance imaging (MRI) to guide surgery.MethodsWe studied 20 patients undergoing ATLR. Structural MRI scans, DTI, and visual fields were acquired before and 3 to 12 months following surgery. Tractography of the optic radiation was performed on preoperative images and propagated onto postoperative images. The anteroposterior extent of the damage to Meyer's loop was determined, and visual loss was quantified using Goldmann perimetry.ResultsTwelve patients (60%) suffered a VFD (10–92% of upper quadrant; median, 39%). Image registration took <3 minutes and predicted that Meyer's loop was 4.4 to 18.7mm anterior to the resection margin in these patients, but 0.0 to 17.6mm behind the resection margin in the 8 patients without VFD. The extent of damage to Meyer's loop significantly correlated with the degree of VFD and explained 65% of the variance in this measure.InterpretationThe optic radiation can be accurately delineated by tractography and propagated onto postoperative images. The technique is fast enough to propagate accurate preoperative tractography onto intraoperative scans acquired during neurosurgery, with the potential to reduce the risk of VFD. ANN NEUROL 2012;

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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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Neurosurgical topography of the optic radiation in the temporal lobe

Cited by 211 publications

References 19 publications

Tractography of Meyer's Loop asymmetries

Tractography of Meyer's Loop asymmetries

Optic radiation tractography and vision in anterior temporal lobe resection

Optimization of tractography of the optic radiations

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