UCL  IRIS
Institutional Research Information Service
UCL Logo
Please report any queries concerning the funding data grouped in the sections named "Externally Awarded" or "Internally Disbursed" (shown on the profile page) to your Research Finance Administrator. Your can find your Research Finance Administrator at http://www.ucl.ac.uk/finance/research/post_award/post_award_contacts.php by entering your department
Please report any queries concerning the student data shown on the profile page to:

Email: portico-services@ucl.ac.uk

Help Desk: http://www.ucl.ac.uk/ras/portico/helpdesk
Publication Detail
Nonlinear phase correction of navigated multi-coil diffusion images
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Atkinson D, Counsell S, Hajnal JV, Batchelor PG, Hill DLG, Larkman DJ
  • Publisher:
    Wiley
  • Publication date:
    19/09/2006
  • Pagination:
    1135, 1139
  • Journal:
    Magnetic Resonance in Medicine
  • Volume:
    56
  • Issue:
    5
  • Print ISSN:
    0740-3194
  • Notes:
    Imported via OAI, 7:29:01 6th Mar 2007
Abstract
Cardiac pulsatility causes a nonrigid motion of the brain. Inmulti-shot diffusion imaging this leads to spatially varying phasechanges that must be corrected. A conjugate gradient basedreconstruction is presented that includes phase changes measuredusing two-dimensional navigator echoes, coil sensitivityinformation, navigator-determined weightings, and data frommultiple coils and averages.A multi-shot echo planar sequence was used to image brainregions where pulsatile motion is not uniform. Reduced susceptibilityartifacts were observed compared to a clinical single-shotsequence. In a higher slice, fiber directions derived from singleshotdata show distortions from anatomical scans by as muchas 7 mm compared to less than 2 mm for our multi-shot reconstructions.The reduced distortions imply that phase encodingcan be applied in the shorter left?right direction, enabling timesavings through the use of a rectangular field of view. Higherresolution diffusion imaging in the spine permits visualizationof a nerve root. Cardiac pulsatility causes a nonrigid motion of the brain. Inmulti-shot diffusion imaging this leads to spatially varying phasechanges that must be corrected. A conjugate gradient basedreconstruction is presented that includes phase changes measuredusing two-dimensional navigator echoes, coil sensitivityinformation, navigator-determined weightings, and data frommultiple coils and averages.A multi-shot echo planar sequence was used to image brainregions where pulsatile motion is not uniform. Reduced susceptibilityartifacts were observed compared to a clinical single-shotsequence. In a higher slice, fiber directions derived from singleshotdata show distortions from anatomical scans by as muchas 7 mm compared to less than 2 mm for our multi-shot reconstructions.The reduced distortions imply that phase encodingcan be applied in the shorter left?right direction, enabling timesavings through the use of a rectangular field of view. Higherresolution diffusion imaging in the spine permits visualizationof a nerve root.
Publication data is maintained in RPS. Visit https://rps.ucl.ac.uk
 More search options
UCL Researchers
Author
Experimental & Translational Medicine
Author
Dept of Med Phys & Biomedical Eng
University College London - Gower Street - London - WC1E 6BT Tel:+44 (0)20 7679 2000

© UCL 1999–2011

Search by