Quantitative metrics for evaluating parallel acquisition techniques in diffusion tensor imaging at 3 Tesla.

Quantitative metrics for evaluating parallel acquisition techniques in diffusion tensor imaging at 3 Tesla. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Quantitative metrics for evaluating parallel acquisition techniques in diffusion tensor imaging at 3 Tesla. Abstract Text:

Siamak Ardekani,Luis Selva,James Sayre,Usha Sinha,Siamak Ardekani,Luis Selva,James Sayre,Usha Sinha,

OBJECTIVES: Single-shot echo-planar based diffusion tensor imaging is prone to geometric and intensity distortions. Parallel imaging is a means of reducing these distortions while preserving spatial resolution. A quantitative comparison at 3 T of parallel imaging for diffusion tensor images (DTI) using k-space (generalized auto-calibrating partially parallel acquisitions; GRAPPA) and image domain (sensitivity encoding; SENSE) reconstructions at different acceleration factors, R, is reported here. MATERIALS AND METHODS: Images were evaluated using 8 human subjects with repeated scans for 2 subjects to estimate reproducibility. Mutual information (MI) was used to assess the global changes in geometric distortions. The effects of parallel imaging techniques on random noise and reconstruction artifacts were evaluated by placing 26 regions of interest and computing the standard deviation of apparent diffusion coefficient and fractional anisotropy along with the error of fitting the data to the diffusion model (residual error). RESULTS: The larger positive values in mutual information index with increasing R values confirmed the anticipated decrease in distortions. Further, the MI index of GRAPPA sequences for a given R factor was larger than the corresponding mSENSE images. The residual error was lowest in the images acquired without parallel imaging and among the parallel reconstruction methods, the R = 2 acquisitions had the least error. The standard deviation, accuracy, and reproducibility of the apparent diffusion coefficient and fractional anisotropy in homogenous tissue regions showed that GRAPPA acquired with R = 2 had the least amount of systematic and random noise and of these, significant differences with mSENSE, R = 2 were found only for the fractional anisotropy index. CONCLUSION: Evaluation of the current implementation of parallel reconstruction algorithms identified GRAPPA acquired with R = 2 as optimal for diffusion tensor imaging.

Quantitative metrics for evaluating parallel acquisition techniques in diffusion tensor imaging at 3 Tesla. Publishing Authors By Initials

S Ardekani,L Selva,J Sayre,U Sinha,S Ardekani,L Selva,J Sayre,U Sinha,

For similar abstracts research abstracts see: abstracts research

PUBMED ID PMID:

MEDLINE DATE:

Quantitative metrics for evaluating parallel acquisition techniques in diffusion tensor imaging at 3 Tesla. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Investigative radiology

VOLUME: 41

Page Numbers: 806-14

Journal Abbreviation:

ISSN: 0020-9996

DAY: 12

MONTH: Nov

YEAR: 2006

Quantitative metrics for evaluating parallel acquisition techniques in diffusion tensor imaging at 3 Tesla. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 45377

Quantitative metrics for evaluating parallel acquisition techniques in diffusion tensor imaging at 3 Tesla. Keywords Mesh Terms:

KEYWORDS:

MESH TERMS:

Chemical & Substance for Abstract: Quantitative metrics for evaluating parallel acquisition techniques in diffusion tensor imaging at 3 Tesla. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Quantitative metrics for evaluating parallel acquisition techniques in diffusion tensor imaging at 3 Tesla.

AFFILIATION: Center for Cardiovascular Bioinformatics and Modeling, Johns Hopkins University, Maryland, USA.

Country: United States

AGENCY: United States NIBIB

GRANT: P01-EB00216

ACRONYM: EB

MEDLINETA: Invest Radiol

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Quantitative metrics for evaluating parallel acquisition techniques in diffusion tensor imaging at 3 Tesla Related Publications

• A functional enhancer of keratin14 is a direct transcriptional target of deltaNp63.
• A normative study of the Coolidge axis-II inventory, short form.
• Alopecia areata: genetic complexity underlies clinical heterogeneity.
• Assessment of single extraction methods for the prediction of bioavailability of metals to Brassica juncea L. Czern. (var. Vaibhav) grown on tannery waste contaminated soil.
• Barking up the wrong tree: the FDA's misguided attempt to waive informed consent in public health emergencies.
• Childhood maltreatment, perceived stress, and stress-related coping in recently abstinent cocaine dependent adults.
• Conscious sedation as an anaesthetic technique in patients undergoing nonthoracotomy placement of automatic implantable cardioverter defibrillator: an initial experience.
• Design, synthesis and antitubercular activity of diarylmethylnaphthol derivatives.
• Difficulties in emotion regulation and impulse control during cocaine abstinence.
• Efficient coding of high frequency signal information in a signal using a linear/non-linear prediction model based on a low pass baseband.
• Exploratory voxel-based analysis of diffusion indices and hemispheric asymmetry in normal aging.
• Greater activation of the "default" brain regions predicts stop signal errors.
• Human genomic DNA quantitation system, H-Quant: development and validation for use in forensic casework.
• Opportunistic infections following renal transplantation.
• Performance monitoring and stop signal inhibition in abstinent patients with cocaine dependence.
• Power-law persistence characterizes traveling waves in coupled circle maps with repulsive coupling.
• Quantitative metrics for evaluating parallel acquisition techniques in diffusion tensor imaging at 3 Tesla.
• Regulation of SHOOT MERISTEMLESS genes via an upstream-conserved noncoding sequence coordinates leaf development.
• Stab anterior preperitoneal hernioplasty in groin hernias: a new technique.
• Statistical representation of mean diffusivity and fractional anisotropy brain maps of normal subjects.
• Stress-induced and alcohol cue-induced craving in recently abstinent alcohol-dependent individuals.
• Studies toward the total synthesis of sorangiolides and their analogues. A convergent stereoselective synthesis of the macrocyclic lactone precursors.
• Study of birefringence of elliptical core photonic crystal fiber using Mathieu function.
• The role of nitric oxide in aspirin induced thrombolysis in vitro and the purification of aspirin activated nitric oxide synthase from human blood platelets.
• The role of stress in addiction relapse.
• The thrombolytic effect of aspirin in animal model.
• Therapeutic magnesium for eclampsia: an unusual cause for antepartum flaccid paralysis.
• Unrecognized descending thoracic aortic compression by transesophageal echocardiographic probe in an infant undergoing cardiac surgery.
• Unusual syndrome among premature infants: association with a new intravenous vitamin E product.
• Vision following extended congenital blindness.