Spread‐spectrum magnetic resonance imaging

Purpose A novel method for the acceleration of MRI acquisition is proposed that relies on the local modulation of magnetic fields. These local modulations provide additional spatial information for image reconstruction that is used to accelerate image acquisition. Methods In experiments and simulati...

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Bibliographic Details
Published in:Magnetic resonance in medicine 2019-09, Vol.82 (3), p.877-885
Main Authors: Scheffler, Klaus, Loktyushin, Alexander, Bause, Jonas, Aghaeifar, Ali, Steffen, Theodor, Schölkopf, Bernhard
Format: Article
Language:English
Subjects:
Acceleration
acquisition acceleration
Current amplifiers
Data acquisition
Image acquisition
Image processing
Image reconstruction
Imaging techniques
local magnetic fields
Magnetic fields
Magnetic resonance imaging
Modulation
NMR
nonlinear field modulation
Nuclear magnetic resonance
parallel imaging
Simulation
Spatial data
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Summary:Purpose A novel method for the acceleration of MRI acquisition is proposed that relies on the local modulation of magnetic fields. These local modulations provide additional spatial information for image reconstruction that is used to accelerate image acquisition. Methods In experiments and simulations, eight local coils connected to current amplifiers were used for rapid local magnetic field variation. Acquired and simulated data were reconstructed to quantify reconstruction errors as a function of the acceleration factor and applied modulation frequency and strength. Results Experimental results demonstrate a possible acceleration factor of 2 to 4. Simulations demonstrate the challenges and limits of this method in terms of required magnetic field modulation strengths and frequencies. A normalized mean squared error of below 10% can be achieved for acceleration factors of up to 8 using modulation field strengths comparable to the readout gradient strength at modulation frequencies in the range of 5 to 20 kHz. Conclusion Spread‐spectrum MRI represents a new approach to accelerate image acquisition, and it can be independently combined with traditional parallel imaging techniques based on local receive coil sensitivities.
ISSN:0740-3194
1522-2594
DOI:10.1002/mrm.27766