48 TPAT accelerated myocardial tagging with a 32-channel coil
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BioMed Central
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Meeting abstract
48 TPAT accelerated myocardial tagging with a 32-channel coil Neil Isaac*1, Scott Akers2, Sven Zuehlsdorff3, Peter Weale3, Sonia NiellesVallespin4, Renate Jerecic3 and Harold Litt1 Address: 1University of Pennsylvania Medical Center, Philadelphia, PA, USA, 2Veterans' Administration Medical Center, Philadelphia, PA, USA, 3Siemens Medical Solutions, Chicago, IL, USA and 4Siemens Medical Solutions, Erlangen, Germany * Corresponding author
from 11th Annual SCMR Scientific Sessions Los Angeles, CA, USA. 1–3 February 2008 Published: 22 October 2008 Journal of Cardiovascular Magnetic Resonance 2008, 10(Suppl 1):A49
doi:10.1186/1532-429X-10-S1-A49
Abstracts of the 11th Annual SCMR Scientific Sessions - 2008
Meeting abstracts – A single PDF containing all abstracts in this Supplement is available here. http://www.biomedcentral.com/content/pdf/1532-429X-10-S1-info.pdfThis abstract is available from: http://jcmr-online.com/content/10/S1/A49 © 2008 Isaac et al; licensee BioMed Central Ltd.
Introduction Myocardial tagging is an established method for evaluating regional function, however current tagging sequences suffer from poor temporal resolution, and sparse distribution of tags across the myocardium. This is a particular problem for analysis of RV function as the normal wall thickness is much less than the typical distance between tags. Parallel imaging techniques can be used to accelerate tagged acquisitions, however high acceleration factors may result in significant artifacts. Temporal parallel acquisition techniques (TPAT) derive coil reference data by using adjacent time frames of an interleaved k-space acquisition scheme, thereby reducing acquisition times. Images are reconstructed using a TSENSE or TGRAPPA algorithm. Additionally, using a coil with multiple independent receiver channels may allow higher acceleration factors with fewer artifacts compared.
Purpose To evaluate the performance of various levels of TPAT accelerated tagged imaging using a 32-channel coil with respect to achievable spatial resolution and tag spacing, in comparison to usual clinical imaging parameters and coils.
Methods Cine imaging with myocardial grid tagging was performed on seven volunteers using a 32-receiver channel 1.5 T system (Avanto, Siemens Medical Solutions). A TPAT accelerated TurboFLASH sequence with an average TR = 40 ms and TE = 4 ms was used. Images obtained using a standard
body matrix phased array coil with 4 independent channels placed anteriorly, and 4 channels from a spine array placed posteriorly were compared with those obtained using an experimental 32-channel phased array coil (InVivo) with 16 anterior and 16 posterior elements. Subjects were imaged with tag spacing ranging from 8 to 4 mm using the standard and 32-channel coils, with a TPAT factor of 2 for the standard coils, and TPAT2 and 4 for the 32channel coil, all with acquisition matrix 256*134. For 3 of the subjects, the acquisition matrix was increased during 32-channel TPAT factor 4 imaging wh
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