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Abstract #3814

Cartesian Whole-Heart Coronary MRA Using Interleaved Auxiliary Image Acquisition and 3D Affine Motion Correction

Markus Henningsson1, Claudia Prieto1, Rene M. Botnar1

1Division of Imaging Sciences and Biomedical Engineering, King's College London, London, United Kingdom

We developed a novel respiratory motion correction technique for Cartesian whole-heart coronary MRA (CMRA) using 3D affine transformation which allows for data acquisition with 100% efficiency. Fully sampled, low resolution auxiliary images are acquired for different respiratory bins, interleaved with high resolution CMRA images. Correction is performed in image space by registering each auxiliary image (bin 2-4) to the end-expiratory image (bin1), thereafter applying the calculated transformation to the corresponding CMRA images which have been similarly binned. The proposed method, with 100% gating efficiency, shows comparable image quality to a 7mm gated scan with 1D FH correction (average gating efficiency=55%).

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Keywords

accurately acquisition acquisitions affine allow angiography applied applying around arteries artifacts auxiliary bins biomedical calculating centric clinical college comparable comprising continues coronary correct corrected correcting correction creating currently cycle dataset defined degrades diaphragmatic division echoes efficiency encoding encompassing ended engineering estimation evenly expiration extensive feasibility feet findings fully gated gating generate generated half head healthy heart illustrated increments induced inspiration interleaved king kingdom leads like measured motion narrow navigator often outwards pixel position positions previous profile profiles prolonged propose proposed protocol quality reconstructed reduce reduced reformatted regardless registering representative residual resolution respiration respiratory sampled sampling scanned scanner sciences segmented selected shot shots simultaneously slice space spaced spiral startup strategy subjects subsequently successive summation throughout tracking trajectory transformation transformations translation traversed underway validate whereas whole window wise yields