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Abstract #1963

Accelerated Carotid 4D flow MRI with Multicontrast HD-PROST Reconstruction

Andreia S Gaspar1,2, Aurelien Bustin1, Karl Kunze3, Radhouene Neji3, Teresa Correia1, Nuno Silva4, Rita G Nunes1,2, René M Botnar1, and Claudia Prieto1

1School of Biomedical Engineering & Imaging Sciences, King's College London, London, United Kingdom, 2ISR-Lisboa/LARSyS and Department of Bioengineering, Instituto Superior Técnico – Universidade de Lisboa, Lisbon, Portugal, 3MR Research Collaborations, Siemens Healthcare Limited, Frimely, United Kingdom, 4Hospital da Luz Learning Health, Lisbon, Portugal

4D flow MRI is time consuming, since it requires the acquisition of time-resolved images with three-directional velocity encoding. Undersampled reconstruction techniques have been proposed to accelerate 4D flow carotid imaging, however scan time remains lengthily for high-resolution acquisitions. In this work, we propose to further accelerate 4D flow carotid MR imaging by exploiting patch-based similarities in local, non-local and multi-contrast dimensions with high-dimensional patch-based undersampled reconstruction (HD-PROST). The results show similar velocities for both k-t SENSE and the proposed HD-PROST, however higher precision was obtained with HD-PROST.

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