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Inversion recovery radial MRI with interleaved projection sets
Author(s) -
Peters Dana C.,
Botnar René M.,
Kissinger Kraig V.,
Yeon Susan B.,
Appelbaum Evan A.,
Manning Warren J.
Publication year - 2006
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.20865
Subject(s) - undersampling , computer science , artificial intelligence , image quality , sliding window protocol , radial stress , computer vision , data acquisition , radial line , interleaving , iterative reconstruction , window (computing) , physics , image (mathematics) , optics , finite element method , thermodynamics , operating system
The radial trajectory has found applications in cardiac imaging because of its resilience to undersampling and motion artifacts. Recent work has shown that interleaved and weighted radial imaging can produce images with multiple contrasts from a single data set. This feature was investigated for inversion recovery imaging of scar using a radial technique. The 2D radial imaging method was modified to acquire quadruply interleaved projection sets within each acquisition window of the cardiac cycle. These data were reconstructed using k ‐space weightings that used a smaller segment of the acquisition window for the central k ‐space data, the determinant of image contrast. This method generates four images with different T 1 weightings. The novel approach was compared with noninterleaved radial imaging, interleaved radial without weightings, and Cartesian imaging in simulations, phantoms, and seven subjects with clinical myocardial infarction. The results show that during a typical acquisition window after an inversion pulse, magnetization changes rapidly. The interleaved acquisition provided better image quality than the noninterleaved radial acquisition. Interleaving with weighting provided better quality when the inversion time (TI) was shorter than optimal; otherwise, interleaving without weighting was superior. These methods enable a radial trajectory to be employed in conjunction with preparation pulses for viability imaging. Magn Reson Med, 2006. © 2006 Wiley‐Liss, Inc.