Abstract #0645

Low-latency real-time 3D imaging for interventional cardiovascular MRI at 0.55T

Prakash Kumar^1,2, Rajiv Ramasawmy², Ahsan Javed², Duc H. Le¹, Kendall J. O'Brien², Andrea E. Jaimes², Kelvin Chow³, Robert J. Lederman², Krishna S. Nayak¹, and Adrienne E. Campbell-Washburn²

¹Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA, United States, ²Cardiovascular Branch, Division of Intramural Research, National Heart, Lung, and Blood Insitute, National Institutes of Health, Bethesda, MD, United States, ³Cardiovascular MR R&D, Siemens Healthcare Ltd., Calgary, AB, Canada

Synopsis

Keywords: MR-Guided Interventions, Acquisition Methods, Image Reconstruction, Low-latency

Motivation: Interventional cardiovascular magnetic resonance (iCMR) is expected to benefit from real-time 3D imaging, because of the potential for superior device tracking, flexible re-slicing of images, and monitoring of cardiac output. Currently, 2D multi-planar imaging is used to guide iCMR with 3-interleaved slices, each updating approximately every second.

Goal(s): To achieve real-time 3D iCMR with ~1 second resolution.

Approach: We use a stack-of-spiral bSSFP acquisition at 0.55T with an online spatiotemporally constrained reconstruction.

Results: We resolve images at varying spatiotemporal resolutions, with low-latency reconstruction(600-1100ms) and demonstrate image quality in healthy volunteers and during iCMR procedures with gadolinium-filled balloon tracking in naïve pigs.

Impact: 3D real-time imaging paired with low-latency image reconstruction and inline image display offers the potential to improve device tracking during MRI-guided cardiac interventions.

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