نتایج جستجو برای: شاخص dti

تعداد نتایج: 79409  

Journal: :AJNR. American journal of neuroradiology 2005
Bryan J Laundre Brian J Jellison Behnam Badie Andrew L Alexander Aaron S Field

BACKGROUND AND PURPOSE The role of diffusion tensor imaging (DTI) in neurosurgical planning and follow-up is currently being defined and needs clinical validation. To that end, we sought correlations between preoperative and postoperative DTI and clinical motor deficits in patients with space-occupying lesions involving the corticospinal tract (CST). METHODS DTI findings in four patients with...

Journal: :Neurosurgery 2014
Aditya Vedantam Michael B Jirjis Brian D Schmit Marjorie C Wang John L Ulmer Shekar N Kurpad

Diffusion tensor imaging (DTI) provides a measure of the directional diffusion of water molecules in tissues. The measurement of DTI indexes within the spinal cord provides a quantitative assessment of neural damage in various spinal cord pathologies. DTI studies in animal models of spinal cord injury indicate that DTI is a reliable imaging technique with important histological and functional c...

2016
Edrea Khong Nicole Odenwald Eyesha Hashim Michael D. Cusimano

OBJECTIVES To review the evidence for the use of diffusion tensor imaging (DTI) parameters in the human brain as a diagnostic tool for and predictor of post-concussion syndrome (PCS) after a mild traumatic brain injury (mTBI). DESIGN Systematic review. DATA SOURCES All relevant studies in AMED, Embase, MEDLINE, Ovid, PubMed, Scopus, and Web of Science through 20 May, 2016. STUDY SELECTION...

Journal: :Experimental neurology 2007
C L Mac Donald K Dikranian S K Song P V Bayly D M Holtzman D L Brody

Traumatic axonal injury (TAI) is thought to be a major contributor to cognitive dysfunction following traumatic brain injury (TBI), however TAI is difficult to diagnose or characterize non-invasively. Diffusion tensor imaging (DTI) has shown promise in detecting TAI, but direct comparison to histologically-confirmed axonal injury has not been performed. In the current study, mice were imaged wi...

2011
Sungsoo Ahn Seung-Koo Lee

With the advances in diffusion magnetic resonance (MR) imaging techniques, diffusion tensor imaging (DTI) has been applied to a number of neurological conditions because DTI can demonstrate microstructures of the brain that are not assessable with conventional MR imaging. Tractography based on DTI offers gross visualization of the white matter fiber architecture in the human brain in vivo. Degr...

Journal: :iranian journal of radiology 0
ihab elaff computer engineering department, faculty of engineering, adnan menderes university, aydin, turkey; computer engineering department, faculty of engineering, adnan menderes university, aydin, turkey. tel: +90-2562137503, fax: +90-2562136686

materials and methods the segmentation process is evaluated using four different clustering methods with different number of clusters where some dti scalar indices for 10 human brains are processed. results the aim was to produce results with less segmentation error and a lower computational cost while attempting to minimizing boundary overlapping and minimizing the effect of artifacts due to m...

2012
Jan S. Gerdes Simon S. Keller Wolfram Schwindt Stefan Evers Siawoosh Mohammadi Michael Deppe

Microstructural alterations of the putamen were recently reported in patients with partial and generalized epilepsy disorders. However, it is unknown whether these alterations pre-exist or are secondary to recurrent seizures. Here we investigated the progression of putamen fractional anisotropy (FA) alterations in a case of recurrent psychomotor seizures using longitudinal diffusion tensor imag...

Journal: :British journal of anaesthesia 2009
L H Lundstrøm A M Møller C Rosenstock G Astrup M R Gätke J Wetterslev

BACKGROUND Previous studies indicate that avoiding neuromuscular blocking agents (NMBAs) may be a risk factor for difficult tracheal intubation (DTI). We investigated whether avoiding NMBA was associated with DTI. METHODS A cohort of 103,812 consecutive patients planned for tracheal intubation by direct laryngoscopy was retrieved from the Danish Anaesthesia Database. We used an intubation sco...

Journal: :AJNR. American journal of neuroradiology 2012
R J Fox K Sakaie J-C Lee J P Debbins Y Liu D L Arnold E R Melhem C H Smith M D Philips M Lowe E Fisher

BACKGROUND AND PURPOSE DTI is increasingly being used as a measure to study tissue damage in several neurologic diseases. Our aim was to investigate the comparability of DTI measures between different MR imaging magnets and platforms. MATERIALS AND METHODS Two healthy volunteers underwent DTI on five 3T MR imaging scanners (3 Trios and 2 Signas) by using a matched 33 noncollinear diffusion-di...

2015
Gilberto Sousa Alves Felipe Kenji Sudo Carlos Eduardo de Oliveira Alves Letice Ericeira-Valente Denise Madeira Moreira Eliasz Engelhardt Jerson Laks

Cerebrovascular disease (CVD) is often present in old age and may be associated with microstructural pathology of white matter (WM) and cognitive dysfunction. The current review investigated the relationship between CVD, cognitive status and WM integrity as assessed by diffusion tensor imaging (DTI). Methods: DTI studies were searched on ISI and Pubmed databases from 2002 to 2012. Results: Stud...

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