Document Detail

Sparsity transform k-t principal component analysis for accelerating cine three-dimensional flow measurements.
MedLine Citation:
PMID:  22887065     Owner:  NLM     Status:  Publisher    
Time-resolved three-dimensional flow measurements are limited by long acquisition times. Among the various acceleration techniques available, k-t methods have shown potential as they permit significant scan time reduction even with a single receive coil by exploiting spatiotemporal correlations. In this work, an extension of k-t principal component analysis is proposed utilizing signal differences between the velocity encodings of three-directional flow measurements to further compact the signal representation and hence improve reconstruction accuracy. The effect of sparsity transform in k-t principal component analysis is demonstrated using simulated and measured data of the carotid bifurcation. Deploying sparsity transform for 8-fold undersampled simulated data, velocity root-mean-square errors were found to decrease by 52 ± 14%, 59 ± 11%, and 16 ± 32% in the common, external, and internal carotid artery, respectively. In vivo, errors were reduced by 15 ± 17% in the common carotid artery with sparsity transform. Based on these findings, spatial resolution of three-dimensional flow measurements was increased to 0.8 mm isotropic resolution with prospective 8-fold undersampling and sparsity transform k-t principal component analysis reconstruction. Volumetric data were acquired in 6 min. Pathline visualization revealed details of helical flow patterns partially hidden at lower spatial resolution. Magn Reson Med, 2012. © 2012 Wiley Periodicals, Inc.
Verena Knobloch; Peter Boesiger; Sebastian Kozerke
Related Documents :
15035455 - Posthaemorrhagic ventricular dilatation: new mechanisms and new treatment.
23657065 - Effects of reduced dialysis fluid flow in hemodialysis.
8424575 - Halothane decreases the rate of production of cerebrospinal fluid. possible role of vas...
1141455 - Variations of deop size in disposable administration sets used for intravenous infusion.
15200045 - Tranexamic acid given into the wound reduces postoperative blood loss by half in major ...
2286575 - Substitution of dl-methionine for soybean meal as a winter supplement for gestating cow...
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-6
Journal Detail:
Title:  Magnetic resonance in medicine : official journal of the Society of Magnetic Resonance in Medicine / Society of Magnetic Resonance in Medicine     Volume:  -     ISSN:  1522-2594     ISO Abbreviation:  Magn Reson Med     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-13     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8505245     Medline TA:  Magn Reson Med     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Wiley Periodicals, Inc.
Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Fabrication of Transistors on Flexible Substrates: from Mass-Printing to High-Resolution Alternative...
Next Document:  Influence of temperature on fluoride toxicity and bioaccumulation in the nonindigenous freshwater mo...