scholarly journals Real-time optical motion correction for diffusion tensor imaging

2011 ◽  
Vol 66 (2) ◽  
pp. 366-378 ◽  
Author(s):  
Murat Aksoy ◽  
Christoph Forman ◽  
Matus Straka ◽  
Stefan Skare ◽  
Samantha Holdsworth ◽  
...  
Keyword(s):  
Diffusion Tensor Imaging ◽  
Real Time ◽  
Motion Correction ◽  
Diffusion Tensor ◽  
Optical Motion

scholarly journals Volumetric navigators for real-time motion correction in diffusion tensor imaging

2012 ◽  
Vol 68 (4) ◽  
pp. 1097-1108 ◽  
Author(s):  
A. Alhamud ◽  
M. Dylan Tisdall ◽  
Aaron T. Hess ◽  
Khader M. Hasan ◽  
Ernesta M. Meintjes ◽  
...  
Keyword(s):  
Diffusion Tensor Imaging ◽  
Real Time ◽  
Motion Correction ◽  
Diffusion Tensor ◽  
Time Motion

scholarly journals In utero diffusion tensor imaging of the fetal brain: a reproducibility study

2017 ◽  
Author(s):  
András Jakab ◽  
Ruth O`Gorman Tuura ◽  
Christian Kellenberger ◽  
Ianina Scheer
Keyword(s):  
Diffusion Tensor Imaging ◽  
White Matter ◽  
Corpus Callosum ◽  
Coefficient Of Variation ◽  
Motion Correction ◽  
Diffusion Tensor ◽  
Structural Similarity ◽  
Image Correlation ◽  
Normal Brain ◽  
Slice Thickness

AbstractOur purpose was to evaluate the within-subject reproducibility of in utero diffusion tensor imaging (DTI) metrics and the visibility of major white matter structures.Images for 30 fetuses (20-33. postmenstrual weeks, normal neurodevelopment: 6 cases, cerebral pathology: 24 cases) were acquired on 1.5T or 3.0T MRI. DTI with 15 diffusion-weighting directions was repeated three times for each case, TR/TE: 2200/63 ms, voxel size: 1*1 mm, slice thickness: 3-5 mm, b-factor: 700 s/mm2. Reproducibility was evaluated from structure detectability, variability of DTI measures using the coefficient of variation (CV), image correlation and structural similarity across repeated scans for six selected structures. The effect of age, scanner type, presence of pathology was determined using Wilcoxon rank sum test.White matter structures were detectable in the following percentage of fetuses in at least two of the three repeated scans: corpus callosum genu 76%, splenium 64%, internal capsule, posterior limb 60%, brainstem fibers 40% and temporooccipital association pathways 60%. The mean CV of DTI metrics ranged between 3% and 14.6% and we measured higher reproducibility in fetuses with normal brain development. Head motion was negatively correlated with reproducibility, this effect was partially ameliorated by motion-correction algorithm using image registration. Structures on 3.0 T had higher variability both with- and without motion correction.Fetal DTI is reproducible for projection and commissural bundles during mid-gestation, however, in 16-30% of the cases, data were corrupted by artifacts, resulting in impaired detection of white matter structures. To achieve robust results for the quantitative analysis of diffusivity and anisotropy values, fetal-specific image processing is recommended and repeated DTI is needed to ensure the detectability of fiber pathways.AbbreviationsADaxial diffusivity;CCAcorpus callosum agenesis;CVcoefficient of variation,DTIdiffusion tensor imaging;FAfractional anisotropy;GWgestational week;MDmean diffusivity;RDradial diffusivity;ROIregion of interest;SSIMstructural similarity index

scholarly journals Real‐time strategy video game experience and structural connectivity – A diffusion tensor imaging study

2018 ◽  
Vol 39 (9) ◽  
pp. 3742-3758 ◽  
Author(s):  
Natalia Kowalczyk ◽  
Feng Shi ◽  
Mikolaj Magnuski ◽  
Maciek Skorko ◽  
Pawel Dobrowolski ◽  
...  
Keyword(s):  
Diffusion Tensor Imaging ◽  
Real Time ◽  
Video Game ◽  
Diffusion Tensor ◽  
Structural Connectivity ◽  
Imaging Study ◽  
Diffusion Tensor Imaging Study

Motion correction algorithms for pediatric spinal cord diffusion tensor imaging

2012 ◽  
Author(s):  
Devon M. Middleton ◽  
Feroze B. Mohamed ◽  
Nadia Barakat ◽  
Louis N. Hunter ◽  
Jurgen Finsterbusch ◽  
...  
Keyword(s):  
Spinal Cord ◽  
Diffusion Tensor Imaging ◽  
Motion Correction ◽  
Diffusion Tensor

Real-Time Atlas-Based Stereotactic Neuronavigation

Neurosurgery ◽  
2013 ◽  
Vol 74 (1) ◽  
pp. 128-134 ◽  
Author(s):  
Mark Vabulas ◽  
Vinodh A. Kumar ◽  
Jackson D. Hamilton ◽  
Juan J. Martinez ◽  
Ganesh Rao ◽  
...  
Keyword(s):  
Diffusion Tensor Imaging ◽  
Real Time ◽  
Functional Mri ◽  
Navigation System ◽  
Diffusion Tensor ◽  
Inferior Frontal Gyrus ◽  
Tumor Resection ◽  
Neurological Deficits ◽  
Magnetic Resonance Imaging Mri ◽  
Time Image

Abstract BACKGROUND: Surgery for tumors in eloquent brain faces immense challenges when attempting to maximize resection and avoid neurological deficits. OBJECTIVE: In order to give the surgeon real-time atlas-based anatomic information linked to the patient's anatomy, we developed a software-based interface between deformable anatomic templates (DATs) and an intraoperative navigation system. METHODS: Magnetic resonance imaging (MRI), diffusion tensor imaging, and/or functional MRI were performed on 3 patients preoperatively for the purposes of tumor resection by the use of neuronavigation. The DAT was registered to the patients' navigation coordinate system and utilized coordinates from the navigation system during surgery. This provided the surgeon with a list of proximal anatomic and functional structures and a real-time image of the atlas at that location fused to the patient's MRI. The clinical feasibility of this approach was evaluated during the resection of 3 eloquent tumors (right postcentral gyrus, left inferior frontal gyrus, and left occipital cuneus gyrus). RESULTS: Tumor resection was performed successfully in all 3 patients. With the use of the coordinates from the navigation system, anatomic and functional structures and their distances were visualized interactively during tumor resection by using the DAT. CONCLUSION: This is a proof of concept that an interactive atlas-based navigation can provide detailed anatomic and functional information that supplements MRI, diffusion tensor imaging, and functional MRI. The atlas-based navigation generated distances to important anatomic structures from the navigation probe tip. It can be used to guide direct electrical stimulation and highlight areas to avoid during tumor resection.

Intraoperative mapping and monitoring of the corticospinal tracts with neurophysiological assessment and 3-dimensional ultrasonography-based navigation

2011 ◽  
Vol 114 (3) ◽  
pp. 738-746 ◽  
Author(s):  
Erez Nossek ◽  
Akiva Korn ◽  
Tal Shahar ◽  
Andrew A. Kanner ◽  
Hillary Yaffe ◽  
...  
Keyword(s):  
Diffusion Tensor Imaging ◽  
Real Time ◽  
Motor Function ◽  
Diffusion Tensor ◽  
Tumor Resection ◽  
Intraoperative Ultrasonography ◽  
Brain Shift ◽  
Corticospinal Tracts ◽  
Subcortical Stimulation ◽  
Neurophysiological Assessment

Object Preserving motor function is a major challenge in surgery for intraaxial brain tumors. Navigation systems are unreliable in predicting the location of the corticospinal tracts (CSTs) because of brain shift and the inability of current intraoperative systems to produce reliable diffusion tensor imaging data. The authors describe their experience with elaborate neurophysiological assessment and tractography-based navigation, corrected in real time by 3D intraoperative ultrasonography (IOUS) to identify motor pathways during subcortical tumor resection. Methods A retrospective analysis was conducted in 55 patients undergoing resection of tumors located within or in proximity to the CSTs at the authors' institution between November 2007 and June 2009. Corticospinal tract tractography was coregistered to surgical navigation-derived images in 42 patients. Direct cortical-stimulated motor evoked potentials (dcMEPs) and subcortical-stimulated MEPs (scrtMEPs) were recorded intraoperatively to assess function and estimate the distance from the CSTs. Intraoperative ultrasonography updated the navigation imaging and estimated resection proximity to the CSTs. Preoperative clinical motor function was compared with postoperative outcome at several time points and correlated with incidences of intraoperative dcMEP alarm and low scrtMEP values. Results The threshold level needed to elicit scrtMEPs was plotted against the distance to the CSTs based on diffusion tensor imaging tractography after brain shift compensation with 3D IOUS, generating a trend line that demonstrated a linear order between these variables, and a relationship of 0.97 mA for every 1 mm of brain tissue distance from the CSTs. Clinically, 39 (71%) of 55 patients had no postoperative deficits, and 9 of the remaining 16 improved to baseline function within 1 month. Seven patients had varying degrees of permanent motor deficits. Subcortical stimulation was applied in 45 of the procedures. The status of 32 patients did not deteriorate postoperatively (stable or improved motor status): 27 of them (84%) displayed minimum scrtMEP thresholds > 7 mA. Six patients who experienced postoperative deterioration quickly recovered (within 5 days) and displayed minimum scrtMEP thresholds > 6.8 mA. Five of the 7 patients who had late (> 5 days postoperatively) or no recovery had minimal scrtMEP thresholds < 3 mA. An scrtMEP threshold of 3 mA was found to be the cutoff point below which irreversible disruption of CST integrity may be anticipated (sensitivity 83%, specificity 95%). Conclusions Combining elaborate neurophysiological assessment, tractography-based neuronavigation, and updated IOUS images provided accurate localization of the CSTs and enabled the safe resection of tumors approximating these tracts. This is the first attempt to evaluate the distance from the CSTs using the threshold of subcortical monopolar stimulation with real-time IOUS for the correction of brain shift. The linear correlation between the distance to the CSTs and the threshold of subcortical stimulation producing a motor response provides an intraoperative technique to better preserve motor function.

scholarly journals Optimal real-time estimation in diffusion tensor imaging

2012 ◽  
Vol 30 (4) ◽  
pp. 506-517 ◽  
Author(s):  
Pablo Casaseca-de-la-Higuera ◽  
Antonio Tristán-Vega ◽  
Santiago Aja-Fernández ◽  
Carlos Alberola-López ◽  
Carl-Fredrik Westin ◽  
...  
Keyword(s):  
Diffusion Tensor Imaging ◽  
Real Time ◽  
Diffusion Tensor ◽  
Time Estimation ◽  
Real Time Estimation

scholarly journals Image Corruption Detection in Diffusion Tensor Imaging for Post-Processing and Real-Time Monitoring

PLoS ONE ◽  
2013 ◽  
Vol 8 (10) ◽  
pp. e49764 ◽  
Author(s):  
Yue Li ◽  
Steven M. Shea ◽  
Christine H. Lorenz ◽  
Hangyi Jiang ◽  
Ming-Chung Chou ◽  
...  
Keyword(s):  
Diffusion Tensor Imaging ◽  
Real Time ◽  
Diffusion Tensor ◽  
Post Processing ◽  
Real Time Monitoring
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