To introduce a novel and generic method for real-time MRI: With high-quality images free of artifacts With multiple contrasts With rapid acquisition (as short as 20 ms per image) and high temporal fidelity (frame rate up to 50 Hz)
Methods and Materials
The approach combines: Fast low-angle shot (FLASH) technique for data acquisition  , which allows for both rapid and continuous imaging without sensitivity to off-resonance artifacts Interleaved radial k -space trajectories for spatial encoding  , which in contrast to Cartesian data sampling offers motion robustness and moderate tolerance to data undersampling Regularized nonlinear inversion (NLINV) for image reconstruction  , which exploits the advantages of parallel imaging with...
Real-time MRI of joint movement Refocused radial FLASH MRI, TR/TE 4.6/2.3 ms (in phase), Flip angle 25°, 73 spokes, acquisition time 336 ms, spatial resolution 0.75x0.75x5 mm 3 , temporal resolution 3 Hz. Real-time MRI of swallowing process Spoiled radial FLASH MRI, TR/TE 2.1/1.4 ms, Flip angle 5°, 25 spokes, acquisition time 52 ms , spatial resolution 1.7x1.7x10 mm 3 , temporal resolution 20 Hz. Real-time MRI of cardiovascular movement Spoiled radial FLASH MRI, TR/TE 2.0/1.3 ms, Flip angle...
The proposed solution to real-time MRI offers pronounced motion robustness, high image quality, no sensitivities to artifacts as known from alternative high-speed MRI techniques, and flexibility in temporal resolution, spatial resolution, and image contrast. This real-time MRI technology will find many new applications in different areas: Dynamic accessment of myocardial and valve functioning, and (turbulent) blood flow properties in the heart or large vessels Online visualization of...
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S. Zhang , M. Uecker, D. Voit, J. Frahm. Biomedizinische NMR Forschungs GmbH, at Max-Planck-Institute for Biophysical Chemistry, Goettingen, Germany Email to: firstname.lastname@example.org