Phase unwinding for dictionary compression with multiple channel transmission in magnetic resonance fingerprinting
Lattanzi R, Zhang B, Knoll F, Asslander J, Cloos MA (2018)
Publication Type: Journal article
Publication year: 2018
Journal
Book Volume: 49
Pages Range: 32-38
DOI: 10.1016/j.mri.2017.12.015
Abstract
Purpose: Magnetic Resonance Fingerprinting reconstructions can become computationally intractable with multiple transmit channels, if the B1 + phases are included in the dictionary. We describe a general method that allows to omit the transmit phases. We show that this enables straightforward implementation of dictionary compression to further reduce the problem dimensionality. Methods: We merged the raw data of each RF source into a single k-space dataset, extracted the transceiver phases from the corresponding reconstructed images and used them to unwind the phase in each time frame. All phase-unwound time frames were combined in a single set before performing SVD-based compression. We conducted synthetic, phantom and in-vivo experiments to demonstrate the feasibility of SVD-based compression in the case of two-channel transmission. Results: Unwinding the phases before SVD-based compression yielded artifact-free parameter maps. For fully sampled acquisitions, parameters were accurate with as few as 6 compressed time frames. SVD-based compression performed well in-vivo with highly under-sampled acquisitions using 16 compressed time frames, which reduced reconstruction time from 750 to 25 min. Conclusion: Our method reduces the dimensions of the dictionary atoms and enables to implement any fingerprint compression strategy in the case of multiple transmit channels.
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APA:
Lattanzi, R., Zhang, B., Knoll, F., Asslander, J., & Cloos, M.A. (2018). Phase unwinding for dictionary compression with multiple channel transmission in magnetic resonance fingerprinting. Magnetic Resonance Imaging, 49, 32-38. https://doi.org/10.1016/j.mri.2017.12.015
MLA:
Lattanzi, Riccardo, et al. "Phase unwinding for dictionary compression with multiple channel transmission in magnetic resonance fingerprinting." Magnetic Resonance Imaging 49 (2018): 32-38.
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