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Neurosurgery and fMRI

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https://www.readbyqxmd.com/read/27695239/surgical-resection-of-low-grade-gliomas-in-eloquent-areas-with-the-guidance-of-the-preoperative-functional-magnetic-resonance-imaging-and-craniometric-points
#1
Ahmed Abdullah, Hisham El Shitany, Waleed Abbass, Amr Safwat, Amr K Elsamman, Ehab El Refaee
OBJECTIVES: Surgical resection of low-grade gliomas (LGGs) in eloquent areas is one of the challenges in neurosurgery, using assistant tools to facilitate effective excision with minimal postoperative neurological deficits has been previously discussed (awake craniotomy and intraoperative cortical stimulation); however, these tools could have their own limitations thus implementation of a simple and effective technique that can guide to safe excision is needed in many situations. MATERIALS AND METHODS: The authors conducted a retrospective analysis of a prospectively collected data of 76 consecutive surgical cases of LGGs of these 21 cases were situated in eloquent areas...
October 2016: Journal of Neurosciences in Rural Practice
https://www.readbyqxmd.com/read/27564466/functional-connectivity-networks-for-preoperative-brain-mapping-in-neurosurgery
#2
Michael G Hart, Stephen J Price, John Suckling
OBJECTIVE Resection of focal brain lesions involves maximizing the resection while preserving brain function. Mapping brain function has entered a new era focusing on distributed connectivity networks at "rest," that is, in the absence of a specific task or stimulus, requiring minimal participant engagement. Central to this frame shift has been the development of methods for the rapid assessment of whole-brain connectivity with functional MRI (fMRI) involving blood oxygenation level-dependent imaging. The authors appraised the feasibility of fMRI-based mapping of a repertoire of functional connectivity networks in neurosurgical patients with focal lesions and the potential benefits of resting-state connectivity mapping for surgical planning...
August 26, 2016: Journal of Neurosurgery
https://www.readbyqxmd.com/read/27445706/the-co-evolution-of-neuroimaging-and-psychiatric-neurosurgery
#3
REVIEW
Timothy G Dyster, Charles B Mikell, Sameer A Sheth
The role of neuroimaging in psychiatric neurosurgery has evolved significantly throughout the field's history. Psychiatric neurosurgery initially developed without the benefit of information provided by modern imaging modalities, and thus lesion targets were selected based on contemporary theories of frontal lobe dysfunction in psychiatric disease. However, by the end of the 20th century, the availability of structural and functional magnetic resonance imaging (fMRI) allowed for the development of mechanistic theories attempting to explain the anatamofunctional basis of these disorders, as well as the efficacy of stereotactic neuromodulatory treatments...
2016: Frontiers in Neuroanatomy
https://www.readbyqxmd.com/read/27132180/development-of-three-dimensional-printed-craniocerebral-models-for-simulated-neurosurgery
#4
Qing Lan, Ailin Chen, Tan Zhang, Guowei Li, Qing Zhu, Xiaomin Fan, Cheng Ma, Tao Xu
OBJECTIVE: To use three-dimensional (3D) printed craniocerebral models to guide neurosurgery and design the best operative route preoperatively. METHODS: Computed tomography, magnetic resonance imaging, computed tomography angiography, and functional magnetic resonance images of the patients were collected as needed, reconstructed to form multicolor 3D craniocerebral images, and printed to form solid 3D models. The hollow aneurysm model was printed with rubberlike material; craniocerebral models were printed with resin or gypsum...
July 2016: World Neurosurgery
https://www.readbyqxmd.com/read/26848557/presurgical-mapping-of-the-language-network-using-resting-state-functional-connectivity
#5
REVIEW
Naoaki Tanaka, Steven M Stufflebeam
Resting-state functional magnetic resonance imaging (resting-state fMRI) is a tool for investigating the functional networks that arise during the resting state of the brain. Recent advances of the resting-state fMRI analysis suggest its feasibility for evaluating language function. The most common clinical application is for presurgical mapping of cortex for a brain tumor or for resective epilespy surgery. In this article, we review the techniques and presurgical applications of resting-state fMRI analysis for language evaluation, and discuss the use in the clinical setting, focusing on planning for neurosurgery...
February 2016: Topics in Magnetic Resonance Imaging: TMRI
https://www.readbyqxmd.com/read/26722848/probabilistic-machine-learning-for-the-evaluation-of-presurgical-language-dominance
#6
Tomer Gazit, Fani Andelman, Yifat Glikmann-Johnston, Tal Gonen, Aliya Solski, Irit Shapira-Lichter, Moran Ovadia, Svetlana Kipervasser, Miriam Y Neufeld, Itzhak Fried, Talma Hendler, Daniella Perry
OBJECTIVE Providing a reliable assessment of language lateralization is an important task to be performed prior to neurosurgery in patients with epilepsy. Over the last decade, functional MRI (fMRI) has emerged as a useful noninvasive tool for language lateralization, supplementing or replacing traditional invasive methods. In standard practice, fMRI-based language lateralization is assessed qualitatively by visual inspection of fMRI maps at a specific chosen activation threshold. The purpose of this study was to develop and evaluate a new computational technique for providing the probability of each patient to be left, right, or bilateral dominant in language processing...
August 2016: Journal of Neurosurgery
https://www.readbyqxmd.com/read/26548825/safe-resection-of-gliomas-of-the-dominant-angular-gyrus-availing-of-preoperative-fmri-and-intraoperative-dti-preliminary-series-and-surgical-technique
#7
Giancarlo D'Andrea, Pietro Familiari, Antonio Di Lauro, Albina Angelini, Giovanni Sessa
OBJECTIVE: Language dysfunction, visual deficit, numeracy impairment, and Gerstmann syndrome often occur in the cortical area; furthermore, the subcortical white matter is the inviolable limit of "functional neurosurgery." Preoperative functional magnetic resonance imaging (fMRI) and tractography are capable of providing the data required for safe "surgical planning" at both the cortical and subcortical levels. METHODS: We report our experience regarding high-grade gliomas affecting the dominant angular gyrus (AG), supramarginal gyrus (SMG), intraparietal sulcus (IPS), and their respective subcortical areas using intraoperative MRI and diffusion tensor imaging (DTI)...
March 2016: World Neurosurgery
https://www.readbyqxmd.com/read/26252986/mapping-the-mirror-neuron-system-in-neurosurgery
#8
Julio Plata Bello, Cristián Modroño, Francisco Marcano, José Luis González-Mora
BACKGROUND: Brain mapping is considered an important approach in neurosurgery to achieve better functional outcomes. The mirror neuron system (MNS) is a brain network implicated in understanding of action and imitation. No previous study has focused on identifying and monitoring the function of the MNS during the perioperative period in brain lesions. The aim of this study was to describe the application of a functional magnetic resonance imaging (fMRI) protocol to identify the MNS in a patient with a lesion in the premotor region...
December 2015: World Neurosurgery
https://www.readbyqxmd.com/read/26246097/pre-operative-fmri-localization-of-the-supplementary-motor-area-and-its-relationship-with-postoperative-speech-deficits
#9
John K Lyo, Julio Arevalo-Perez, Nicole Petrovich Brennan, Kyung K Peck, Andrei I Holodny
INTRODUCTION: Neurosurgery of the supplementary motor area (SMA) is associated with transient speech defects. We investigated whether SMA laterality correlates with postoperative speech defects. MATERIALS AND METHODS: The authors reviewed 17 patients with SMA-area lesion resection and preoperative language fMRI. SMA laterality was calculated by comparison of voxel activation in paired SMAs by hand-drawn regions of interest (ROIs) (drawn by a neuroradiologist), and compared with qualitative assessment by two neuroradiologists...
June 2015: Neuroradiology Journal
https://www.readbyqxmd.com/read/26214023/integration-of-multimodal-neuroimaging-methods-a-rationale-for-clinical-applications-of-simultaneous-eeg-fmri
#10
REVIEW
Piera Vitali, Carol Di Perri, Anna Elisabetta Vaudano, Stefano Meletti, Flavio Villani
Functional magnetic resonance imaging (fMRI), which has high spatial resolution, is increasingly used to evaluate cerebral functions in neurological and psychiatric diseases. The main limitation of fMRI is that it detects neural activity indirectly, through the associated slow hemodynamic variations. Because neurovascular coupling can be regionally altered by pathological conditions or drugs, fMRI responses may not truly reflect neural activity. Electroencephalography (EEG) recordings, which directly detect neural activity with optimal temporal resolution, can now be obtained during fMRI data acquisition...
January 2015: Functional Neurology
https://www.readbyqxmd.com/read/26097525/reorganization-of-language-areas-in-patient-with-a-frontal-lobe-low-grade-glioma-fmri-case-study
#11
Katarzyna Kośla, Bartosz Bryszewski, Dariusz Jaskólski, Nina Błasiak-Kołacińska, Ludomir Stefańczyk, Agata Majos
BACKGROUND: Functional magnetic resonance (fMRI) studies results in case of an adult patient with low grade glioma (LGG) in dominant hemisphere suggest brain plasticity process with acquisition of language functions by the non-dominant hemisphere speech regions. CASE REPORT: A 36-years old right-handed woman was admitted to the Department of Neurosurgery for surgical treatment of brain tumor. An MRI examination revealed a pathological mass in the left frontal lobe, in close topographical relationship to the Broca's area...
2015: Polish Journal of Radiology
https://www.readbyqxmd.com/read/26029041/objective-bayesian-fmri-analysis-a-pilot-study-in-different-clinical-environments
#12
Joerg Magerkurth, Laura Mancini, William Penny, Guillaume Flandin, John Ashburner, Caroline Micallef, Enrico De Vita, Pankaj Daga, Mark J White, Craig Buckley, Adam K Yamamoto, Sebastien Ourselin, Tarek Yousry, John S Thornton, Nikolaus Weiskopf
Functional MRI (fMRI) used for neurosurgical planning delineates functionally eloquent brain areas by time-series analysis of task-induced BOLD signal changes. Commonly used frequentist statistics protect against false positive results based on a p-value threshold. In surgical planning, false negative results are equally if not more harmful, potentially masking true brain activity leading to erroneous resection of eloquent regions. Bayesian statistics provides an alternative framework, categorizing areas as activated, deactivated, non-activated or with low statistical confidence...
2015: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/25791396/inclusion-of-attentional-networks-in-the-pre-surgical-neuroimaging-assessment-of-a-large-deep-hemispheric-cavernous-malformation-an-fmri-case-report
#13
Marla J S Mickleborough, Michael E Kelly, Layla Gould, Chelsea Ekstrand, Eric Lorentz, Tasha Ellchuk, Paul Babyn, Ron Borowsky
BACKGROUND AND IMPORTANCE: Functional magnetic resonance imaging (fMRI) is a noninvasive and reliable tool for mapping eloquent cortex in patients prior to brain surgery. Ensuring intact perceptual and cognitive processing is a key goal for neurosurgeons, and recent research has indicated the value of including attentional network processing in pre-surgical fMRI in order to help preserve such abilities, including reading, after surgery. CLINICAL PRESENTATION: We report a 42-year-old patient with a large cavernous malformation, near the left basal ganglia...
2015: Cerebrovascular Diseases
https://www.readbyqxmd.com/read/25741734/what-do-patients-with-epilepsy-tell-us-about-language-dynamics-a-review-of-fmri-studies
#14
REVIEW
Monica Baciu, Marcela Perrone-Bertolotti
The objective of this review is to resume major neuroimaging findings on language organization and plasticity in patients with focal and refractory epilepsy, to discuss the effect of modulatory variables that should be considered alongside patterns of reorganization, and to propose possible models of language reorganization. The focal and refractory epilepsy provides a real opportunity to investigate various types of language reorganization in different conditions. The 'chronic' condition (induced by the epileptogenic zone or EZ) is associated with either recruitment of homologous regions of the opposite hemisphere or recruitment of intrahemispheric, nonlinguistic regions...
2015: Reviews in the Neurosciences
https://www.readbyqxmd.com/read/25571558/rapid-and-low-invasive-functional-brain-mapping-by-realtime-visualization-of-high-gamma-activity-for-awake-craniotomy
#15
K Kamada, H Ogawa, C Kapeller, R Prueckl, C Guger
For neurosurgery with an awake craniotomy, the critical issue is to set aside enough time to identify eloquent cortices by electrocortical stimulation (ECS). High gamma activity (HGA) ranging between 80 and 120 Hz on electrocorticogram (ECoG) is assumed to reflect localized cortical processing. In this report, we used realtime HGA mapping and functional magnetic resonance imaging (fMRI) for rapid and reliable identification of motor and language functions. Three patients with intra-axial tumors in their dominant hemisphere underwent preoperative fMRI and lesion resection with an awake craniotomy...
2014: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/25408305/the-role-of-automatic-computer-aided-surgical-trajectory-planning-in-improving-the-expected-safety-of-stereotactic-neurosurgery
#16
M Trope, R R Shamir, L Joskowicz, Z Medress, G Rosenthal, A Mayer, N Levin, A Bick, Y Shoshan
PURPOSE: Minimal invasion computer-assisted neurosurgical procedures with various tool insertions into the brain may carry hemorrhagic risks and neurological deficits. The goal of this study is to investigate the role of computer-based surgical trajectory planning tools in improving the potential safety of image-based stereotactic neurosurgery. METHODS: Multi-sequence MRI studies of eight patients who underwent image-guided neurosurgery were retrospectively processed to extract anatomical structures-head surface, ventricles, blood vessels, white matter fibers tractography, and fMRI data of motor, sensory, speech, and visual areas...
July 2015: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/25246146/localizing-hand-motor-area-using-resting-state-fmri-validated-with-direct-cortical-stimulation
#17
Tian-ming Qiu, Chao-gan Yan, Wei-jun Tang, Jin-song Wu, Dong-xiao Zhuang, Cheng-jun Yao, Jun-feng Lu, Feng-ping Zhu, Ying Mao, Liang-fu Zhou
BACKGROUND: Resting-state functional magnetic resonance imaging (R-fMRI) is a promising tool in clinical application, especially in presurgical mapping for neurosurgery. This study aimed to investigate the sensitivity and specificity of R-fMRI in the localization of hand motor area in patients with brain tumors validated by direct cortical stimulation (DCS). We also compared this technique to task-based blood oxygenation level-dependent (BOLD) fMRI (T-fMRI). METHODS: R-fMRI and T-fMRI were acquired from 17 patients with brain tumors...
December 2014: Acta Neurochirurgica
https://www.readbyqxmd.com/read/24380641/probabilistic-fiber-tracking-of-the-language-and-motor-white-matter-pathways-of-the-supplementary-motor-area-sma-in-patients-with-brain-tumors
#18
Mehrnaz Jenabi, Kyung K Peck, Robert J Young, Nicole Brennan, Andrei I Holodny
BACKGROUND AND PURPOSE: Accurate localization of anatomically and functionally separate SMA tracts is important to improve planning prior to neurosurgery. Using fMRI and probabilistic DTI techniques, we assessed the connectivity between the frontal language area (Broca's area) and the rostral pre-SMA (language SMA) and caudal SMA proper (motor SMA). MATERIALS AND METHODS: Twenty brain tumor patients completed motor and language fMRI paradigms and DTI. Peaks of functional activity in the language SMA, motor SMA and Broca's area were used to define seed regions for probabilistic tractography...
December 2014: Journal of Neuroradiology. Journal de Neuroradiologie
https://www.readbyqxmd.com/read/24028885/presurgical-identification-of-the-central-sulcus-using-ge-epi-sequences-in-combination-with-3d-reconstruction-is-a-useful-and-easy-technique-for-functional-identification-of-the-sensorimotor-cortex
#19
A Lüttich, G Parrilla, M Espinosa, J Zamarro, J A Larrea, A Moreno
Functional magnetic resonance imaging (fMRI) is a noninvasive neuroimaging technique that enables the visualization of vascular changes originating in the cortex on the execution of a simple motor task. We aimed to assess the usefulness of sensorimotor fMRI using echo-planar imaging (EPI) techniques and assess its clinical usefulness in the identification of the central sulcus. We studied 32 candidates for neurosurgery who had centrally located space-occupying lesions with fMRI using EPI images with blood oxygen level-dependent (BOLD) gradient-echo (GE) sequences acquired on a 1...
March 2012: Neuroradiology Journal
https://www.readbyqxmd.com/read/23584216/functional-imaging-where-do-we-go-from-here
#20
REVIEW
D Kuhnt, M H A Bauer, O Ganslandt, C Nimsky
As highly invasive and infiltrative tumors, gliomas are hard to delineate from healthy brain parenchyma, even with the microscope enhanced eye of an experienced neurosurgeon. However, the surgical goal remains maximum extent of tumor volume resection with a preservation of neurological function. With functional data integrated and visualized in the navigation system, postoperative morbidity can be reduced. With the so far well established techniques diffusion-tensor-imaging (DTI) based fiber tractography and functional MRI (fMRI), white matter tracts or eloquent cortical areas can be displayed...
March 2013: Journal of Neurosurgical Sciences
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