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Computational AND Spinal Cord

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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
#1
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/28192461/canine-neuroanatomy-development-of-a-3d-reconstruction-and-interactive-application-for-undergraduate-veterinary-education
#2
Hazel Raffan, Julien Guevar, Matthieu Poyade, Paul M Rea
Current methods used to communicate and present the complex arrangement of vasculature related to the brain and spinal cord is limited in undergraduate veterinary neuroanatomy training. Traditionally it is taught with 2-dimensional (2D) diagrams, photographs and medical imaging scans which show a fixed viewpoint. 2D representations of 3-dimensional (3D) objects however lead to loss of spatial information, which can present problems when translating this to the patient. Computer-assisted learning packages with interactive 3D anatomical models have become established in medical training, yet equivalent resources are scarce in veterinary education...
2017: PloS One
https://www.readbyqxmd.com/read/28185477/measuring-pain-phenomena-after-spinal-cord-injury-development-and-psychometric-properties-of-the-sci-qol-pain-interference-and-pain-behavior-assessment-tools
#3
Matthew L Cohen, Pamela A Kisala, Trevor A Dyson-Hudson, David S Tulsky
OBJECTIVE: To develop modern patient-reported outcome measures that assess pain interference and pain behavior after spinal cord injury (SCI). DESIGN: Grounded-theory based qualitative item development; large-scale item calibration field-testing; confirmatory factor analyses; graded response model item response theory analyses; statistical linking techniques to transform scores to the Patient Reported Outcome Measurement Information System (PROMIS) metric. SETTING: Five SCI Model Systems centers and one Department of Veterans Affairs medical center in the United States...
February 10, 2017: Journal of Spinal Cord Medicine
https://www.readbyqxmd.com/read/28168634/imaging-of-post-operative-spine-in-intervertebral-disc-pathology
#4
REVIEW
A Splendiani, F D'Orazio, L Patriarca, F Arrigoni, F Caranci, P Fonio, L Brunese, A Barile, E Di Cesare, C Masciocchi
This work is an imaging review of spine after surgery with special regard to imaging modality in intervertebral disc pathology. Advances in imaging technology can be evaluated. Depending on the clinical question is asked to the radiologist, it is possible to evaluate post-operative patients with conventional radiology (X-ray), computed tomography and magnetic resonance. Main indications for each technique are analysed. Imaging is important in the diagnosis of many forms of spine pathology and plays a fundamental role in evaluating post-surgical effects of treatments, according to the imaging method which is used, both on spine and on its surrounding tissues (intervertebral discs, spinal cord, muscles and vessels)...
February 6, 2017: Musculoskeletal Surgery
https://www.readbyqxmd.com/read/28162645/-399-patient-specific-computer-models-of-spinal-cord-stimulation-for-chronic-pain-management
#5
S Lempka, J Ozinga, A Wyant, F Dong, S Jones, S Nagel, A Machado
No abstract text is available yet for this article.
April 2016: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/28155678/compression-distraction-reduction-surgical-verification-and-optimization-to-treat-the-basilar-invagination-and-atlantoaxial-dislocation-a-finite-element-analysis
#6
Xuefeng Bo, Weida Wang, Zan Chen, Zhicheng Liu
BACKGROUND: Basilar invagination (BI) combined with atlantoaxial dislocation (AAD) leads to foramen magnum stenosis and medullary spinal cord compression, causing nerve dysfunction. The purpose of the surgery is to remove the bony compression at brainstem ventral side and fix the unstable spinal segment and make it fused stably. Occipital cervical internal fixation system that simultaneously reduces atlantoaxial horizontal and vertical dislocation are established. We propose here a new compression-distraction reduction (CDR) technique...
December 28, 2016: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28152039/individualized-3d-printing-navigation-template-for-pedicle-screw-fixation-in-upper-cervical-spine
#7
Fei Guo, Jianhao Dai, Junxiang Zhang, Yichuan Ma, Guanghui Zhu, Junjie Shen, Guoqi Niu
PURPOSE: Pedicle screw fixation in the upper cervical spine is a difficult and high-risk procedure. The screw is difficult to place rapidly and accurately, and can lead to serious injury of spinal cord or vertebral artery. The aim of this study was to design an individualized 3D printing navigation template for pedicle screw fixation in the upper cervical spine. METHODS: Using CT thin slices data, we employed computer software to design the navigation template for pedicle screw fixation in the upper cervical spine (atlas and axis)...
2017: PloS One
https://www.readbyqxmd.com/read/28133742/technical-note-a-method-to-evaluate-dosimetric-effects-on-organs-at-risk-for-treatment-delivery-systematic-uncertainties
#8
Shi Liu, Thomas R Mazur, Yabo Fu, H Harold Li, Sasa Mutic, Deshan Yang
PURPOSE: The aim of this study is to provide a practical method to quantify the dosimetric effects on organs-at-risk (OARs) due to systematic uncertainties in linear accelerator treatment delivery in order to aid external beam treatment planning and raise warnings about additional risks to critical OARs. METHODS: A dose approximation method, based on geometrical transformations, was developed to automatically estimate perturbations to dose volumes arising from five important potential uncertainties at the time of treatment delivery, including 1) systematic isocenter misalignment between image guidance and beam delivery systems, and systematic errors in 2) collimator, 3) gantry, 4) couch table, and 5) multi-leaf collimator (MLC) leaf bank positions...
January 30, 2017: Medical Physics
https://www.readbyqxmd.com/read/28131888/eeg-neural-correlates-of-goal-directed-movement-intention
#9
Joana Pereira, Patrick Ofner, Andreas Schwarz, Andreea Ioana Sburlea, Gernot R Müller-Putz
Using low-frequency time-domain electroencephalographic (EEG) signals we show, for the same type of upper limb movement, that goal-directed movements have different neural correlates than movements without a particular goal. In a reach-and-touch task, we explored the differences in the movement-related cortical potentials (MRCPs) between goal-directed and non-goal-directed movements. We evaluated if the detection of movement intention was influenced by the goal-directedness of the movement. In a single-trial classification procedure we found that classification accuracies are enhanced if there is a goal-directed movement in mind...
January 25, 2017: NeuroImage
https://www.readbyqxmd.com/read/28130805/topologically-preserving-straightening-of-spinal-cord-mri
#10
Benjamin De Leener, Gabriel Mangeat, Sara Dupont, Allan R Martin, Virginie Callot, Nikola Stikov, Michael G Fehlings, Julien Cohen-Adad
PURPOSE: To propose a robust and accurate method for straightening magnetic resonance (MR) images of the spinal cord, based on spinal cord segmentation, that preserves spinal cord topology and that works for any MRI contrast, in a context of spinal cord template-based analysis. MATERIALS AND METHODS: The spinal cord curvature was computed using an iterative Non-Uniform Rational B-Spline (NURBS) approximation. Forward and inverse deformation fields for straightening were computed by solving analytically the straightening equations for each image voxel...
January 27, 2017: Journal of Magnetic Resonance Imaging: JMRI
https://www.readbyqxmd.com/read/28129972/on-the-use-of-volumetric-modulated-arc-therapy-for-single-fraction-thoracic-vertebral-metastases-stereotactic-body-radiosurgery
#11
Damodar Pokhrel, Sumit Sood, Christopher McClinton, Xinglei Shen, Rajeev Badkul, Hongyu Jiang, Matthew Mallory, Mellissa Mitchell, Fen Wang, Christopher Lominska
To retrospectively evaluate quality, efficiency, and delivery accuracy of volumetric-modulated arc therapy (VMAT) plans for single-fraction treatment of thoracic vertebral metastases using image-guided stereotactic body radiosurgery (SBRS) after RTOG 0631 dosimetric compliance criteria. After obtaining credentialing for MD Anderson spine phantom irradiation validation, 10 previously treated patients with thoracic vertebral metastases with noncoplanar hybrid arcs using 1 to 2 3D-conformal partial arcs plus 7 to 9 intensity-modulated radiation therapy beams were retrospectively re-optimized with VMAT using 3 full coplanar arcs...
January 24, 2017: Medical Dosimetry: Official Journal of the American Association of Medical Dosimetrists
https://www.readbyqxmd.com/read/28118155/the-effects-of-human-height-and-mass-on-the-calculated-induced-electric-fields-at-50-hz-for-comparison-with-the-emf-directive-2013-35-eu
#12
R P Findlay
A worker's height and mass can significantly affect the way in which incident low frequency electric and magnetic fields are absorbed in the body. To investigate this, several anatomically realistic human models were produced for heights between 1.56 and 1.96 m and masses between 33 and 113 kg. The human models were derived from the MAXWEL surface-based phantom, the model previously used in the EMF Directive 2013/35/EU Practical Guide to demonstrate how induced electric fields in the body are calculated. Computer simulations were carried out to calculate the low frequency EMF directive exposure limit value (ELV) quantities, i...
January 24, 2017: Journal of Radiological Protection: Official Journal of the Society for Radiological Protection
https://www.readbyqxmd.com/read/28115070/longitudinal-investigation-of-rehospitalization-patterns-in-spinal-cord-and-traumatic-brain-injury-among-medicare-beneficiaries
#13
Christopher R Pretz, James E Graham, Addie Middleton, Amol M Karmarkar, Kenneth J Ottenbacher
OBJECTIVE: To model 12-month rehospitalization risk among Medicare beneficiaries receiving inpatient rehabilitation for SCI or TBI and to create two (SCI- and TBI-specific) interactive tools enabling users to generate monthly projected probabilities for rehospitalization based on an individual patient's clinical profile at discharge from inpatient rehabilitation. DESIGN: Secondary data analysis. SETTING: More than 1,100 inpatient rehabilitation facilities across the US...
January 20, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28114045/interaction-detection-in-egocentric-video-towards-a-novel-outcome-measure-for-upper-extremity-function
#14
Jirapat Likitlersuang, Jose Zariffa
In order to develop effective interventions for restoring upper extremity function after cervical spinal cord injury, tools are needed to accurately measure hand function throughout the rehabilitation process. However, there is currently no suitable method to collect information about hand function in the community, when patients are not under direct observation of a clinician. We propose a wearable system that can monitor functional hand use using computer vision techniques applied to egocentric camera videos...
December 7, 2016: IEEE Journal of Biomedical and Health Informatics
https://www.readbyqxmd.com/read/28113631/the-role-of-audio-visual-feedback-in-a-thought-based-control-of-a-humanoid-robot-a-bci-study-in-healthy-and-spinal-cord-injured-people
#15
Emmanuele Tidoni, Pierre Gergondet, Gabriele Fusco, Abderrahmane Kheddar, Salvatore Aglioti
The efficient control of our body and successful interaction with the environment are possible through the integration of multisensory information. Brain-computer interface (BCI) may allow people with sensorimotor disorders to actively interact in the world. In this study, visual information was paired with auditory feedback to improve the BCI control of a humanoid surrogate. Healthy and spinal cord injured (SCI) people were asked to embody a humanoid robot and complete a pick-and-place task by means of a visual evoked potentials BCI system...
August 3, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28111622/cruciate-paralysis-in-a-20-year-old-male-with-an-undisplaced-type-iii-odontoid-fracture
#16
Mansukhani Sameer A, Tuteja Sanesh V, Dhar Sanjay B
INTRODUCTION: Cruciate Paralysis is a rare incomplete spinal cord syndrome presenting as brachial diplegia with minimal or no involvement of the lower extremities. It occurs as a result of trauma to the cervical spine and is associated with fractures of the axis and/or atlas. Diagnosis is confirmed on MRI and is managed by treatment of the underlying pathology. Prognosis depends on the extent of spinal cord injury and the exact cause. CASE PRESENTATION: A 20-year-old male presented to the casualty with a history of an injury to the back of the head as a result of a fall...
April 2016: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/28106617/determinants-of-health-knowledge-and-health-perceptions-from-the-perspective-of-health-related-education-of-patients-with-spinal-cord-injury-a-systematic-review
#17
Piotr Tederko, Tomasz Krasuski, Marek Krasuski, Alicja Długołęcka, Beata Tarnacka
Appropriate health knowledge (HK) and health perceptions (HP) of patients with spinal cord injury (SCI) are linked to health-related behaviors, compliance, the involvement of caregivers and efficacy of prophylaxis, and management of secondary conditions. The significance of factors determining the efficacy of educational interventions in patients with SCI is underestimated. This systematic literature review aims at identification of determinants of HK and HP among patients with SCI. We identified 16 papers with quantitative HK and HP measurements conclusive in the identification of HK and HP determinants in individuals with SCI...
January 18, 2017: International Journal of Rehabilitation Research. Revue Internationale de Recherches de Réadaptation
https://www.readbyqxmd.com/read/28104936/myelopathy-in-adult-aortic-coarctation-causes-and-caveats-of-an-atypical-presentation
#18
Chandan Mourya, Ashish Verma, Anand Bansal, Ram C Shukla, Arvind Srivastava
A 57-year-old female presenting with acute-onset paraplegia was referred for magnetic resonance imaging (MRI) of cervico-dorsal spine. On MRI, multiple tortuous dilated vessels were noted in the epidural space with long segment cord compression and imaging features of compressive myelopathy. Associated small acute cervico-dorsal epidural hematoma was also noted in the same region. Computed tomography (CT) angiography was performed subsequently which revealed post-ductal coarctation of aorta with multiple arterial collaterals in the chest wall and spinal canal...
October 2016: Indian Journal of Radiology & Imaging
https://www.readbyqxmd.com/read/28103899/intraoperative-evaluation-using-mobile-computed-tomography-in-anterior-cervical-decompression-with-floating-method-for-massive-ossification-of-the-posterior-longitudinal-ligament
#19
Toshitaka Yoshii, Takashi Hirai, Tsuyoshi Yamada, Hiroyuki Inose, Tsuyoshi Kato, Kenichiro Sakai, Mitsuhiro Enomoto, Shigenori Kawabata, Yoshiyasu Arai, Atsushi Okawa
BACKGROUND: An anterior decompression and fusion (ADF) with the floating method is an effective procedure for treating ossification of the posterior longitudinal ligament (OPLL), allowing a direct decompressive effect on the spinal cord. However, the procedure is skill-intensive, particularly in cases of OPLL with a high canal-occupying ratio. In such cases, there are potential risks for insufficient decompression due to the incomplete floating of the OPLL. Here, we introduce an anterior decompression procedure for massive OPLL, using an intraoperative computed tomography (CT) with a mobile scanner gantry for the intraoperative evaluation of the decompression...
January 19, 2017: Journal of Orthopaedic Surgery and Research
https://www.readbyqxmd.com/read/28092564/static-vs-dynamic-decoding-algorithms-in-a-non-invasive-body-machine-interface
#20
Ismael Seanez-Gonzalez, Camilla Pierella, Ali Farshchiansadegh, Elias Barry Thorp, Farnaz Abdollahi, Jessica P Pedersen, Ferdinando A Mussa-Ivaldi
In this study, we consider a non-invasive bodymachine interface that captures body motions still available to people with spinal cord injury (SCI) and maps them into a set of signals for controlling a computer user interface while engaging in a sustained level of mobility and exercise. We compare the effectiveness of two decoding algorithms that transform a highdimensional body-signal vector into a lower dimensional control vector on 6 subjects with high-level SCI and 8 controls. One algorithm is based on a static map from current body signals to the current value of the control vector set through principal component analysis (PCA), the other on dynamic mapping a segment of body signals to the value and the temporal derivatives of the control vector set through a Kalman filter...
December 15, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
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