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3D T1 MRI epilepsy

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https://www.readbyqxmd.com/read/27894944/surface-projected-flair-supr-flair-analysis-a-novel-tool-for-advanced-imaging-of-epilepsy
#1
Francesco Cardinale, Stefano Francione, Luciana Gennari, Alberto Citterio, Maurizio Sberna, Laura Tassi, Roberto Mai, Ivana Sartori, Lino Nobili, Massimo Cossu, Laura Castana, Giorgio Lo Russo, Nadia Colombo
OBJECTIVE: The objective of this pilot retrospective study is to describe the SUrface-PRojected FLuid-Attenuation-Inversion-Recovery (SUPR-FLAIR) analysis, a novel method mainly aimed at revealing cortical areas with subtle signal hyper-intensity. METHODS: Images from 101 healthy controls and ten patients suffering from drug-resistant partial epilepsy were retrospectively post-processed. Brain surface was reconstructed from a 3D T1-weighted fast field echo (3D T1W-FFE) MRI scan...
November 25, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27603778/detection-of-lesions-underlying-intractable-epilepsy-on-t1-weighted-mri-as-an-outlier-detection-problem
#2
Meriem El Azami, Alexander Hammers, Julien Jung, Nicolas Costes, Romain Bouet, Carole Lartizien
Pattern recognition methods, such as computer aided diagnosis (CAD) systems, can help clinicians in their diagnosis by marking abnormal regions in an image. We propose a machine learning system based on a one-class support vector machine (OC-SVM) classifier for the detection of abnormalities in magnetic resonance images (MRI) applied to patients with intractable epilepsy. The system learns the features associated with healthy control subjects, allowing a voxelwise assessment of the deviation of a test subject pattern from the learned patterns...
2016: PloS One
https://www.readbyqxmd.com/read/27489767/automated-subfield-volumetric-analysis-of-hippocampus-in-temporal-lobe-epilepsy-using-high-resolution-t2-weighed-mr-imaging
#3
Daichi Sone, Noriko Sato, Norihide Maikusa, Miho Ota, Kaoru Sumida, Kota Yokoyama, Yukio Kimura, Etsuko Imabayashi, Yutaka Watanabe, Masako Watanabe, Mitsutoshi Okazaki, Teiichi Onuma, Hiroshi Matsuda
BACKGROUND AND PURPOSE: Automated subfield volumetry of hippocampus is desirable for use in temporal lobe epilepsy (TLE), but its utility has not been established. Automatic segmentation of hippocampal subfields (ASHS) and the new version of FreeSurfer software (ver.6.0) using high-resolution T2-weighted MR imaging are candidates for this volumetry. The aim of this study was to evaluate hippocampal subfields in TLE patients using ASHS as well as the old and new versions of FreeSurfer...
2016: NeuroImage: Clinical
https://www.readbyqxmd.com/read/27298250/relationship-between-epilepsy-and-colpocephaly-in-baboons-papio-hamadryas
#4
C Ákos Szabó, Melissa De La Garza, Karen Rice, Carlos Bazan Iii, Felipe S Salinas
Brain MRI scans revealed various occipital horn variants in a pedigreed baboon colony consisting of Papio hamadryas anubis and its hybrids. We retrospectively characterized these variants and evaluated their relationships to epilepsy phenotypes and scalp EEG findings. MRI scans (3D, T1-weighted) from 208 baboons (female, 134 female; male, 74; age [mean ± 1 SD], 16 ± 5 y) were reviewed; 139 (67%) of these animals also underwent scalp EEG previously. Occipital horn variants included elongation (extension of the occipital ventricle behind the mediobasal origin of the calcarine fissure), which affected 23 baboons (11%; 7 bilateral, 9 left, 7 right), and elongation with enlargement (colpocephaly), which occurred in 30 baboons (14%; 7 bilateral, 11 left, 12 right)...
2016: Comparative Medicine
https://www.readbyqxmd.com/read/26865066/progression-of-gray-matter-atrophy-in-seizure-free-patients-with-temporal-lobe-epilepsy
#5
Marina K M Alvim, Ana C Coan, Brunno M Campos, Clarissa L Yasuda, Mariana C Oliveira, Marcia E Morita, Fernando Cendes
OBJECTIVES: To investigate the presence and progression of gray matter (GM) reduction in seizure-free patients with temporal lobe epilepsy (TLE). METHODS: We enrolled 39 consecutive TLE patients, seizure-free for at least 2 years--20 with magnetic resonance imaging (MRI) signs of hippocampal sclerosis (TLE-HS), 19 with normal MRI (TLE-NL), and 74 healthy controls. For longitudinal analysis, we included individuals who had a second MRI with minimum interval of 18 months: 21 patients (10 TLE-HS, 11 TLE-NL) and 11 controls...
April 2016: Epilepsia
https://www.readbyqxmd.com/read/26778405/7t-mri-in-focal-epilepsy-with-unrevealing-conventional-field-strength-imaging
#6
MULTICENTER STUDY
Alessio De Ciantis, Carmen Barba, Laura Tassi, Mirco Cosottini, Michela Tosetti, Mauro Costagli, Manuela Bramerio, Emanuele Bartolini, Laura Biagi, Massimo Cossu, Veronica Pelliccia, Mark R Symms, Renzo Guerrini
OBJECTIVE: To assess the diagnostic yield of 7T magnetic resonance imaging (MRI) in detecting and characterizing structural lesions in patients with intractable focal epilepsy and unrevealing conventional (1.5 or 3T) MRI. METHODS: We conducted an observational clinical imaging study on 21 patients (17 adults and 4 children) with intractable focal epilepsy, exhibiting clinical and electroencephalographic features consistent with a single seizure-onset zone (SOZ) and unrevealing conventional MRI...
March 2016: Epilepsia
https://www.readbyqxmd.com/read/25085233/prognostic-value-of-ca4-dg-volumetry-with-3t-magnetic-resonance-imaging-on-postoperative-outcome-of-epilepsy-patients-with-dentate-gyrus-pathology
#7
Meng Na, Yanshu Liu, Chen Shi, Wenpeng Gao, Haitao Ge, Yu Wang, Haiyang Wang, Yu Long, Hong Shen, Changbin Shi, Zhiguo Lin
PURPOSE: Hippocampal sclerosis (HS), the most common feature of mesial temporal lobe epilepsy (MTLE), is widely accepted as surgical indication for refractory epilepsy. Pathological hallmarks in hippocampal dentate gyrus (DG), including granule cell loss (GCL) and granule cell dispersion (GCD), are known to be closely related to the status epilepticus and spontaneous seizure. Our aim was to assess the association between volumetric changes in the hippocampal CA4/DG determined with 3-Tesla (3T) magnetic resonance imaging (MRI) and the postoperative seizure outcomes in MTLE patients with or without dentate gyrus pathology (DGP)...
October 2014: Epilepsy Research
https://www.readbyqxmd.com/read/24973130/is-the-type-and-extent-of-hippocampal-sclerosis-measurable-on-high-resolution-mri
#8
H Urbach, H J Huppertz, R Schwarzwald, A J Becker, J Wagner, M Delsous Bahri, H J Tschampa
INTRODUCTION: The purpose of this study is to relate hippocampal volume and FLAIR signal intensity to Wyler grading of hippocampal sclerosis (HS). METHODS: Of 100 consecutive patients with temporal lobe epilepsy and HS as histopathological diagnosis, 32 had high-resolution 3 Tesla MRI and anatomically well-preserved hippocampi following amygdalo-hippocampectomy. Hippocampal volume on 3D T1-weighted gradient echo and signal intensity on coronal FLAIR sequences were determined using FreeSurfer and SPM tools and related to Wyler grading...
September 2014: Neuroradiology
https://www.readbyqxmd.com/read/24690576/case-report-practicability-of-functionally-based-tractography-of-the-optic-radiation-during-presurgical-epilepsy-work-up
#9
F C Schmitt, J Kaufmann, M B Hoffmann, C Tempelmann, C Kluge, S Rampp, J Voges, H J Heinze, L Buentjen, M Grueschow
Pre-operative tractography of the optic radiation (OR) has been advised to assess the risk for postoperative visual field deficit (VFD) in certain candidates for resective epilepsy surgery. Diffusion tensor imaging (DTI) tractography relies on a precise anatomical determination of start and target regions of interest (ROIs), such as the lateral geniculate nucleus (LGN) and the primary visual cortex (V1). The post-chiasmal visual pathway and V1 show considerable inter-individual variability, and in epilepsy patients parenchymatous lesions might further complicate this matter...
May 7, 2014: Neuroscience Letters
https://www.readbyqxmd.com/read/24579160/epileptogenic-lesion-quantification-in-mri-using-contralateral-3d-texture-comparisons
#10
Oscar Alfonso Jiménez del Toro, Antonio Foncubierta-Rodríguez, Maria Isabel Vargas Gómez, Henning Müller, Adrien Depeursinge
Epilepsy is a disorder of the brain that can lead to acute crisis and temporary loss of brain functions. Surgery is used to remove focal lesions that remain resistant to treatment. An accurate localization of epileptogenic lesions has a strong influence on the outcome of epilepsy surgery. Magnetic resonance imaging (MRI) is clinically used for lesion detection and treatment planning, mainly through simple visual analysis. However, visual inspection in MRI can be highly subjective and subtle 3D structural abnormalities are not always entirely removed during surgery...
2013: Medical Image Computing and Computer-assisted Intervention: MICCAI ..
https://www.readbyqxmd.com/read/24062718/disentangling-hippocampal-shape-anomalies-in-epilepsy
#11
Hosung Kim, Tommaso Mansi, Neda Bernasconi
Drug-resistant temporal lobe epilepsy (TLE) and epileptic syndromes related to malformations of cortical development (MCD) are associated with complex hippocampal morphology. The contribution of volume and position to the overall hippocampal shape in these conditions has not been studied. We propose a surface-based framework to localize volume changes through measurement of Jacobian determinants, and quantify fine-scale position and curvature through a medial axis model. We applied our methodology to T1-weighted 3D volumetric MRI of 88 patients with TLE and 78 patients with MCD, including focal cortical dysplasia (FCD, n = 29), heterotopia (HET, n = 40), and polymicrogyria (PMG, n = 19)...
2013: Frontiers in Neurology
https://www.readbyqxmd.com/read/23827066/-reduction-of-gray-and-white-matters-in-patients-with-temporal-lobe-epilepsy-and-its-correlation-with-disease-duration
#12
Jing-jing Lu, Wen-jing Li, Hui-guang He, Feng Feng, Zheng-yu Jin, Li-wen Wu
OBJECTIVE: To measure the volumetric changes of gray and white matters in patients with temporal lobe epilepsy(TLE)using voxel-based morphometric study(VBM)and correlate the changes with clinical parameters. METHODS: A total of 71 TLE patients were enrolled in the study,and 22 healthy subjects served as normal controls. Routine brain MRI and 3D fast spoiled gradient echo(FSPGR)T1-weighted images of all the subjects were acquired. The 3D structural images were co-registered,segmented and smoothed,and then the images were analyzed using the optimized VBM with preprocessed using Diffeomorphic Anatomical Registration using Exponentiated Lie algebra(DARTEL)algorithm...
June 2013: Zhongguo Yi Xue Ke Xue Yuan Xue Bao. Acta Academiae Medicinae Sinicae
https://www.readbyqxmd.com/read/23340274/subcortical-structural-abnormalities-in-juvenile-myoclonic-epilepsy-jme-mr-volumetry-and-vertex-based-analysis
#13
J Saini, S Sinha, B S Bagepally, C T Ramchandraiah, K Thennarasu, C Prasad, A B Taly, P Satishchandra
PURPOSE: Imaging studies in juvenile myoclonic epilepsy (JME) have shown abnormalities of the thalamus and frontal cortex. The purpose of this study was to systematically investigate the morphological changes in the deep gray matter (GM) structures using techniques of voxel based morphometry (VBM), MR volumetry and shape analysis. METHODOLOGY: The study included 40 patients with JME (M:F=21:19; age 22.8±5.3 years) and 19 matched controls (M:F=13:6; age 24.5±4...
April 2013: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/22481382/volume-estimation-of-the-thalamus-using-freesurfer-and-stereology-consistency-between-methods
#14
Simon S Keller, Jan S Gerdes, Siawoosh Mohammadi, Christoph Kellinghaus, Harald Kugel, Katja Deppe, E Bernd Ringelstein, Stefan Evers, Wolfram Schwindt, Michael Deppe
Freely available automated MR image analysis techniques are being increasingly used to investigate neuroanatomical abnormalities in patients with neurological disorders. It is important to assess the specificity and validity of automated measurements of structure volumes with respect to reliable manual methods that rely on human anatomical expertise. The thalamus is widely investigated in many neurological and neuropsychiatric disorders using MRI, but thalamic volumes are notoriously difficult to quantify given the poor between-tissue contrast at the thalamic gray-white matter interface...
October 2012: Neuroinformatics
https://www.readbyqxmd.com/read/21835245/automated-mr-image-classification-in-temporal-lobe-epilepsy
#15
Niels K Focke, Mahinda Yogarajah, Mark R Symms, Oliver Gruber, Walter Paulus, John S Duncan
In those with drug refractory focal epilepsy, MR imaging is important for identifying structural causes of seizures that may be amenable to surgical treatment. In up to 25% of potential surgical candidates, however, MRI is reported as unremarkable even when employing epilepsy specific sequences. Automated MRI classification is a desirable tool to augment the interpretation of images, especially when changes are subtle or distributed and may be missed on visual inspection. Support vector machines (SVM) have recently been described to be useful for voxel-based MR image classification...
January 2, 2012: NeuroImage
https://www.readbyqxmd.com/read/20307956/evaluation-of-mri-criteria-1-5-t-for-the-diagnosis-of-hippocampal-sclerosis-in-healthy-subjects
#16
K Menzler, J Iwinska-Zelder, K Shiratori, R K Jaeger, W H Oertel, H M Hamer, F Rosenow, S Knake
PURPOSE: The presence of hippocampal sclerosis (HS) on MRI has a great impact on the clinical evaluation and counselling of patients with temporal lobe epilepsy (TLE) and is considered as a key criterion for the decision to recommend epilepsy surgery. However, neuropathological studies describe evidence of HS in up to 10% of non-epileptic individuals, questioning the impact of this MRI finding in patients with TLE. We evaluated the prevalence of HS on MRI in the general population. METHODS: 100 healthy subjects and 10 patients with TLE due to HS were investigated in a prospective study using a specific protocol for the detection of hippocampal pathology (coronal FLAIR, coronal T2 TSE and a T1 weighted 3D SPGR sequence)...
May 2010: Epilepsy Research
https://www.readbyqxmd.com/read/18801644/-resting-cbf-in-the-epileptic-baboon-correlation-with-ketamine-dose-and-interictal-epileptic-discharges
#17
C Akos Szabó, Shalini Narayana, Crystal Franklin, Koyle D Knape, M Duff Davis, Peter T Fox, M Michelle Leland, Jeff T Williams
BACKGROUND: Photosensitive epileptic (SZ) baboons demonstrate different cerebral blood flow (CBF) activation patterns from asymptomatic controls (CTL) during intermittent light stimulation (ILS). This study compares "resting" CBF between PS and CTL animals, and CBF correlations with ketamine dose and interictal epileptic discharges (IEDs) between PS and CTL animals. METHODS: Continuous intravenous ketamine was administered to eight PS and eight CTL baboons (matched for gender and weight), and maintained at subanesthetic doses (4...
November 2008: Epilepsy Research
https://www.readbyqxmd.com/read/18490143/thalamic-diffusion-and-volumetry-in-temporal-lobe-epilepsy-with-and-without-mesial-temporal-sclerosis
#18
Gaolang Gong, Luis Concha, Christian Beaulieu, Donald W Gross
PURPOSE: As an important connection within the limbic system, considerable attention has been paid to thalamic pathology in temporal lobe epilepsy (TLE). Magnetic resonance imaging (MRI) volumetric studies have yielded variable results and have largely been focused on TLE with mesial temporal sclerosis (TLE+). Diffusion tensor imaging (DTI) provides unique information on microstructure based on the measurement of water diffusion. To date, DTI properties of thalamus have not been well characterized in adult TLE patients with unilateral MTS or without MTS (TLE-)...
August 2008: Epilepsy Research
https://www.readbyqxmd.com/read/18425622/comparison-of-two-different-measurement-techniques-of-hippocampal-resection-length-in-temporal-lobe-epilepsy-results-of-a-prospective-study
#19
COMPARATIVE STUDY
J E Scorzin, R König, C-A Müller, R Fimmers, H Urbach, T-N Lehmann, J Zentner, J Schramm
BACKGROUND: Magnetic resonance imaging (MRI) volumetry has evolved to a highly sensitive method for presurgical detection of hippocampal sclerosis in temporal lobe epilepsy (TLE). Seizure resolution and neuropsychological sequelae are believed to correlate with extent of resection. Therefore an easy volumetric method to determine extent of resection is desirable. The purpose of this work is to evaluate and compare two different measurement techniques for hippocampal resection length. METHODS: Sixty-one patients with a mean seizure history of 25...
August 2008: Acta Neurochirurgica
https://www.readbyqxmd.com/read/18091249/coregistration-of-digital-photography-of-the-human-cortex-and-cranial-magnetic-resonance-imaging-for-visualization-of-subdural-electrodes-in-epilepsy-surgery
#20
Mehran Mahvash, Roy König, Jörg Wellmer, Horst Urbach, Bernhard Meyer, Karl Schaller
OBJECTIVE: To develop a method for the coregistration of digital photographs of the human cortex with head magnetic resonance imaging (MRI) scans for invasive diagnostics and resective neocortical epilepsy surgery. METHODS: Six chronically epileptic patients (two women, four men; mean age, 34 yr; age range, 20-43 yr) underwent preoperative three-dimensional (3D) T1-weighted MRI scans. Digital photographs of the exposed cortex were taken during implantation of subdural grid electrodes...
November 2007: Neurosurgery
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