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https://www.readbyqxmd.com/read/28540122/presurgical-role-of-mri-tractography-in-a-case-of-extensive-cervicothoracic-spinal-ependymoma
#1
Francesca Granata, Sergio Racchiusa, Enricomaria Mormina, Valeria Barresi, Giada Garufi, Giovanni Grasso, Francesco Maria Salpietro, Marcello Longo, Concetta Alafaci
BACKGROUND: Intramedullary spinal ependymoma is a tumor, hardly characterizable with conventional magnetic resonance (MR) imaging only. MR diffusion tensor imaging (DTI) with three-dimensional fiber-tracking reconstructions allows the evaluation of the relationship between neoplasm and white matter fiber tracts, being a powerful tool in presurgical planning. We present DTI findings in a case of a young female with an extensive cervicothoracic spinal ependymoma. CASE DESCRIPTION: The patient complained of a 2-month history of acute urinary retention, weakness and numbness on the lower limbs and the upper left limb...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/28429407/spinal-cord-injury-induces-widespread-chronic-changes-in-cerebral-white-matter
#2
Tero Ilvesmäki, Eerika Koskinen, Antti Brander, Teemu Luoto, Juha Öhman, Hannu Eskola
Traumatic spinal cord injuries (SCIs) lead to axonal damage at the trauma site, as well as disconnections within the central nervous system. While the exact mechanisms of the long-term pathophysiological consequences of SCIs are not fully understood, it is known that neuronal damage and degeneration are not limited to the direct proximity of the trauma. Instead, the effects can be detected even in the cerebrum. We examined SCI-induced chronic brain changes with a case-control design using 32 patients and 70 control subjects...
April 21, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28428213/clinically-feasible-microstructural-mri-to-quantify-cervical-spinal-cord-tissue-injury-using-dti-mt-and-t2-weighted-imaging-assessment-of-normative-data-and-reliability
#3
A R Martin, B De Leener, J Cohen-Adad, D W Cadotte, S Kalsi-Ryan, S F Lange, L Tetreault, A Nouri, A Crawley, D J Mikulis, H Ginsberg, M G Fehlings
BACKGROUND AND PURPOSE: DTI, magnetization transfer, T2*-weighted imaging, and cross-sectional area can quantify aspects of spinal cord microstructure. However, clinical adoption remains elusive due to complex acquisitions, cumbersome analysis, limited reliability, and wide ranges of normal values. We propose a simple multiparametric protocol with automated analysis and report normative data, analysis of confounding variables, and reliability. MATERIALS AND METHODS: Forty healthy subjects underwent T2WI, DTI, magnetization transfer, and T2*WI at 3T in <35 minutes using standard hardware and pulse sequences...
April 20, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28428212/a-novel-mri-biomarker-of-spinal-cord-white-matter-injury-t2-weighted-white-matter-to-gray-matter-signal-intensity-ratio
#4
A R Martin, B De Leener, J Cohen-Adad, D W Cadotte, S Kalsi-Ryan, S F Lange, L Tetreault, A Nouri, A Crawley, D J Mikulis, H Ginsberg, M G Fehlings
BACKGROUND AND PURPOSE: T2*-weighted imaging provides sharp contrast between spinal cord GM and WM, allowing their segmentation and cross-sectional area measurement. Injured WM demonstrates T2*WI hyperintensity but requires normalization for quantitative use. We introduce T2*WI WM/GM signal-intensity ratio and compare it against cross-sectional area, the DTI metric fractional anisotropy, and magnetization transfer ratio in degenerative cervical myelopathy. MATERIALS AND METHODS: Fifty-eight patients with degenerative cervical myelopathy and 40 healthy subjects underwent 3T MR imaging, covering C1-C7...
April 20, 2017: AJNR. American Journal of Neuroradiology
https://www.readbyqxmd.com/read/28385062/diffusion-tensor-imaging-parameter-obtained-during-acute-blunt-cervical-spinal-cord-injury-in-predicting-long-term-outcome
#5
Kathirkamanthan Shanmuganathan, Jiachen Zhuo, Hegang H Chen, Bizhan Aarabi, Jason Adams, Catriona Miller, Jay Menaker, Rao Gullapallie, Stuart E Mirvis
There are no reliable neuroimaging biomarkers to predict long term outcome following spinal cord injury. This prospective longitudinal study evaluates diffusion tensor imaging (DTI) in predicting long term outcome following cervical spinal cord injury (CSCI). We investigate the admission DTI parameters measured in 30 patients with CSCI, with 16 of them followed up to 1 year, and 15 volunteers serving as controls. All MRI examinations were performed within 24 hours of injury. DTI parameters were measured in patients and controls, avoiding areas of hemorrhage in patients and at corresponding upper/middle/lower regions of the spinal cord in controls...
April 6, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28378287/pediatric-thoracic-sciwora-after-back-bend-during-dance-practice-a-retrospective-case-series-and-analysis-of-trauma-mechanisms
#6
Jian Ren, Gao Zeng, Yong-Jie Ma, Nan Chen, Zan Chen, Feng Ling, Hong-Qi Zhang
PURPOSE: The purpose of the study was to describe a unique type of low-energy traumatic pediatric thoracic spinal cord injury without radiographic abnormality (SCIWORA) after a back bend during dance practice and analyze the trauma mechanisms and treatment protocols. METHODS: This was a retrospective case series from September 2007 to August 2016. The study was conducted at a tertiary medical center in Beijing, China (Xuanwu Hospital, China International Neuroscience Institute [China-INI], Capital Medical University)...
April 4, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28351750/a-longitudinal-dti-and-histological-study-of-the-spinal-cord-reveals-early-pathological-alterations-in-g93a-sod1-mouse-model-of-amyotrophic-lateral-sclerosis
#7
Stefania Marcuzzo, Silvia Bonanno, Matteo Figini, Alessandro Scotti, Ileana Zucca, Ludovico Minati, Nilo Riva, Teuta Domi, Andrea Fossaghi, Angelo Quattrini, Barbara Galbardi, Sara D'Alessandro, Maria Grazia Bruzzone, José Manuel García-Verdugo, Victoria Moreno-Manzano, Renato Mantegazza, Pia Bernasconi
Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease characterized by selective motor neuron degeneration in the motor cortex, brainstem and spinal cord. It is generally accepted that ALS is caused by death of motor neurons, however the exact temporal cascade of degenerative processes is not yet completely known. To identify the early pathological changes in spinal cord of G93A-SOD1 ALS mice we performed a comprehensive longitudinal analysis employing diffusion-tensor magnetic resonance imaging alongside histology and electron microscopy, in parallel with peripheral nerve histology...
March 27, 2017: Experimental Neurology
https://www.readbyqxmd.com/read/28347419/advanced-neuroimaging-in-the-evaluation-of-spinal-cord-tumors-and-tumor-mimics-diffusion-tensor-and-perfusion-weighted-imaging
#8
Xiang Liu, Wei Tian, Hongyan Chen, Thomas A LoStracco, Jing Zhang, Michael Yan Li, Barbara Germin, Henry Z Wang
Spinal cord tumors are an important component of pathologic diseases involving the spinal cord. Conventional magnetic resonance (MR) imaging only provides anatomical information. MR diffusion tensor imaging (DTI) and MR perfusion-weighted imaging (PWI) may detect microstructure diffusion and hemodynamic changes in these tumors. We review recent application studies of MR DTI and PWI in spinal cord tumors. Overall, MR DTI and MR PWI are promising imaging tools that are especially useful in improving differential diagnosis between spinal cord tumors and tumor mimics, preoperative evaluation of resectability, and providing assistance in surgical navigation...
April 2017: Seminars in Ultrasound, CT, and MR
https://www.readbyqxmd.com/read/28320182/axial-mr-diffusion-tensor-imaging-and-tractography-in-clinical-diagnosed-and-pathology-confirmed-cervical-spinal-cord-astrocytoma
#9
Mangsuo Zhao, Bingxin Shi, Tuoyu Chen, Yuqi Zhang, Tongchao Geng, Liyan Qiao, Mingjie Zhang, Le He, Huancong Zuo, Guihuai Wang
OBJECTIVE: To evaluate the diffusion tensor imaging (DTI) and diffusion tensor tractography (DTT) features of cervical spinal cord astrocytoma. METHODS: Eleven patients with cervical spinal cord astrocytomas and 10 healthy volunteers were recruited in this study. Conventional magnetic resonance imaging (MRI) and axial DTI were performed on a 3.0T MRI system. Apparent diffusion coefficient (ADC), fractional anisotropy (FA), axial diffusivity (AD), and radial diffusivity (RD) values for the lesions were measured...
April 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28291025/evaluation-of-reproducibility-of-diffusion-tensor-imaging-in-the-brachial-plexus-at-3-0-t
#10
Michael J Ho, Andrei Manoliu, Felix Pierre Kuhn, Bram Stieltjes, Markus Klarhöfer, Thorsten Feiweier, Magda Marcon, Gustav Andreisek
OBJECTIVE: The aim of this study was to evaluate the reproducibility of 3 T magnetic resonance imaging diffusion tensor imaging (DTI) of the brachial plexus in healthy subjects. METHODS: Ten healthy volunteers were included, and morphological and DTI sequences of the nerve roots of the brachial plexus from C5 to T1 of both sides were repeatedly acquired on a 3 T magnetic resonance system (MAGNETOM Skyra; Siemens Healthcare, Erlangen, Germany). A prototype diffusion-weighted single-shot echo-planar imaging sequence-enabling slice-specific shim adjustments was performed with b-values of 0 and 800 s/mm in 30 gradient directions, resulting in an acquisition time of about 6 minutes each in axial orientation...
March 13, 2017: Investigative Radiology
https://www.readbyqxmd.com/read/28269510/network-effects-and-pathways-in-deep-brain-stimulation-in-parkinson-s-disease
#11
N Koirala, V Fleischer, O Granert, G Deuschl, M Muthuraman, S Groppa
Deep brain stimulation of subthalamic nucleus (STN-DBS) became a standard therapeutic option in Parkinson's disease (PD), even though the underlying modulated network of STN-DBS is still poorly described. Probabilistic tractography and connectivity analysis as derived from diffusion tensor imaging (DTI) were performed together with modelling of implanted electrode positions and linked postoperative clinical outcome. Fifteen patients with idiopathic PD without dementia were selected for DBS treatment. After pre-processing, probabilistic tractography was run from cortical and subcortical seeds of the hypothesized network to targets represented by the positions of the active DBS contacts...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28242068/diffusion-tensor-mr-imaging-in-spinal-cord-injury
#12
Maria M D'souza, Ajay Choudhary, Mahesh Poonia, Pawan Kumar, Subash Khushu
BACKGROUND: The ability of diffusion tensor imaging (DTI) to complement conventional MR imaging by diagnosing subtle injuries to the spinal cord is a subject of intense research. We attempted to study change in the DTI indices, namely fractional anisotropy (FA) and mean diffusivity (MD) after traumatic cervical spinal cord injury and compared these with corresponding data from a control group of individuals with no injury. The correlation of these quantitative indices to the neurological profile of the patients was assessed...
February 21, 2017: Injury
https://www.readbyqxmd.com/read/28227763/network-effects-and-pathways-in-deep-brain-stimulation-in-parkinson-s-disease
#13
N Koirala, V Fleischer, O Granert, G Deuschl, M Muthuraman, S Groppa, N Koirala, V Fleischer, O Granert, G Deuschl, M Muthuraman, S Groppa
Deep brain stimulation of subthalamic nucleus (STN-DBS) became a standard therapeutic option in Parkinson's disease (PD), even though the underlying modulated network of STN-DBS is still poorly described. Probabilistic tractography and connectivity analysis as derived from diffusion tensor imaging (DTI) were performed together with modelling of implanted electrode positions and linked postoperative clinical outcome. Fifteen patients with idiopathic PD without dementia were selected for DBS treatment. After pre-processing, probabilistic tractography was run from cortical and subcortical seeds of the hypothesized network to targets represented by the positions of the active DBS contacts...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28218643/diffusion-assessment-of-cortical-changes-induced-by-traumatic-spinal-cord-injury
#14
Peng Sun, Rory K J Murphy, Paul Gamble, Ajit George, Sheng-Kwei Song, Wilson Z Ray
Promising treatments are being developed to promote functional recovery after spinal cord injury (SCI). Magnetic resonance imaging, specifically Diffusion Tensor Imaging (DTI) has been shown to non-invasively measure both axonal and myelin integrity following traumatic brain and SCI. A novel data-driven model-selection algorithm known as Diffusion Basis Spectrum Imaging (DBSI) has been proposed to more accurately delineate white matter injury. The objective of this study was to investigate whether DTI/DBSI changes that extend to level of the cerebral peduncle and internal capsule following a SCI could be correlated with clinical function...
February 17, 2017: Brain Sciences
https://www.readbyqxmd.com/read/28207659/evaluation-of-dti-parameter-ratios-and-diffusion-tensor-tractography-grading-in-the-diagnosis-and-prognosis-prediction-of-cervical-spondylotic-myelopathy
#15
Kun Wang, Zhi Chen, Fan Zhang, Qingxin Song, Canglong Hou, Yixing Tang, Jun Wang, Shiyue Chen, Yun Bian, Qiang Hao, Hongxing Shen
STUDY DESIGN: Prospective cohort. OBJECTIVE: To explore the correlations between diffusion tensor imaging (DTI) ratios and diffusion tensor tractography (DTT) grading with clinical symptoms and outcomes of cervical spondylotic myelopathy (CSM). SUMMARY OF BACKGROUND DATA: In addition to magnetic resonance imaging (MRI) and computed tomography, DTI may be useful in understanding pathophysiology of spinal cord in earlier stages of the CSM but it may be confounded by age and cervical level, and previous studies had small sample sizes...
February 15, 2017: Spine
https://www.readbyqxmd.com/read/28173745/characterization-of-chronic-axonal-degeneration-using-diffusion-tensor-imaging-in-canine-spinal-cord-injury-a-quantitative-analysis-of-dti-parameters-according-to-histopathological-differences
#16
Hakyoung Yoon, Jaehwan Kim, Won-Jin Moon, Sang-Soep Nahm, Jun Zhao, Hyoung-Moon Kim, Kidong Eom
Diffusion tensor imaging (DTI) is more sensitive than conventional magnetic resonance imaging (MRI) for the identification of axonal degeneration. However, no study to date has used DTI to evaluate the severity of axonal degeneration in canine spinal cord injury. Therefore, the aim of this study was to characterize multi-grade axonal degeneration (mild, moderate, and severe) in a canine model of spinal cord compression injury using DTI. MRI data were obtained from six normal dogs and five dogs with lumbar spinal cord injury 78 days after spinal cord injury (L1-L3) using a 3T MRI scanner...
February 7, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28140499/deterministic-tractography-of-the-descending-tract-of-the-spinal-trigeminal-nerve-using-diffusion-tensor-imaging
#17
Daniel J Burkett, Jonathan R Garst, Jacquelyn P Hill, Anthony Kam, Douglas E Anderson
BACKGROUND AND PURPOSE: Pain information from the face enters the pons via the trigeminal nerve before creating an anatomical "elbow" that turns caudally into the spinal trigeminal tract (SpTV). Visualization of the descending tract of the trigeminal nerve as it begins its descent from the nerve root entry zone (NREZ) in the pons would improve the accuracy of current procedures aimed at altering or lesioning the trigeminal nerve within the brainstem. The focus of this study was to develop a standardized protocol using diffusion tensor imaging (DTI) and deterministic tractography methods to image the SpTV...
January 31, 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28088799/use-of-spinal-cord-diffusion-tensor-imaging-to-quantify-neural-ablation-and-evaluate-outcome-after-percutaneous-cordotomy-for-intractable-cancer-pain
#18
Aditya Vedantam, Ping Hou, T Linda Chi, Patrick M Dougherty, Kenneth R Hess, Ashwin Viswanathan
BACKGROUND: Up to 20% of patients experience only partial pain relief after percutaneous cordotomy for cancer pain. OBJECTIVE: To determine whether diffusion tensor imaging (DTI) can quantify neural ablation and help evaluate early postoperative outcomes after cordotomy. METHODS: Patients undergoing percutaneous CT-guided cordotomy for intractable cancer pain were prospectively studied. Pre- and postoperative assessment was made using the visual analog scale (VAS) on pain and the pain severity scores of the Brief Pain Inventory Short Form...
2017: Stereotactic and Functional Neurosurgery
https://www.readbyqxmd.com/read/28072502/wallerian-degeneration-beyond-the-corticospinal-tracts-conventional-and-advanced-mri-findings
#19
REVIEW
Yin Jie Chen, Seyed Ali Nabavizadeh, Arastoo Vossough, Sunil Kumar, Laurie A Loevner, Suyash Mohan
Wallerian degeneration (WD) is defined as progressive anterograde disintegration of axons and accompanying demyelination after an injury to the proximal axon or cell body. Since the 1980s and 1990s, conventional magnetic resonance imaging (MRI) sequences have been shown to be sensitive to changes of WD in the subacute to chronic phases. More recently, advanced MRI techniques, such as diffusion-weighted imaging (DWI) and diffusion tensor imaging (DTI), have demonstrated some of earliest changes attributed to acute WD, typically on the order of days...
May 2017: Journal of Neuroimaging: Official Journal of the American Society of Neuroimaging
https://www.readbyqxmd.com/read/28056284/-clinical-value-of-diffusion-tensor-imaging-parameter-value-in-evaluating-the-prognosis-of-spinal-cord-injury-in-acute-cervical-spinal-cord-injury
#20
Z M Zou, J Li, Q Y Cao, H X Lian, C N He, B Wang
Objective: To evaluate the clinical application value of diffusion tensor imaging (DTI) parameter in evaluating the prognosis of spinal cord injury in acute cervical spinal cord injury. Method: From October 2012 to December 2015, a total of 23 patients with acute cervical spinal cord injury were examined by routine MRI-T2WI high signal DTI examination, according to the American Spinal Injury Association (ASIA) damage standard. One month later according to the functional outcome of the spinal cord, all patients were divided into non improvement group (group A) 4 cases (2 cases of ASIA-A, 2 cases of grade B) and improvement group (group B) 19 cases (13 cases of ASIA-C, 5 cases of grade D, 1 case of grade B), 15 cases of healthy volunteers as the normal group (group C )...
January 3, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
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