Abstract #1963

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

Andreia S Gaspar^1,2, Aurelien Bustin¹, Karl Kunze³, Radhouene Neji³, Teresa Correia¹, Nuno Silva⁴, Rita G Nunes^1,2, 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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