True constructive interference in the steady state (trueCISS)

Hilbert, Tom; Nguyen, Damien; Thiran, Jean‐Philippe; Krueger, Gunnar; Kober, Tobias; Bieri, Oliver

doi:10.1002/mrm.26836

Cited by 9 publications

(22 citation statements)

References 31 publications

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“…Recently, several methods have been proposed to accelerate phase‐cycled bSSFP measurements . Individual measurements exhibit a large degree of redundancy which can be exploited by compressed sensing techniques to enable severe undersampling.…”

Section: Discussionmentioning

confidence: 99%

“…Individual measurements exhibit a large degree of redundancy which can be exploited by compressed sensing techniques to enable severe undersampling. Hilbert and coworkers proposed a model‐based reconstruction that reduces the number of unknowns in the reconstruction problem by estimating the relaxation time ratio Γ = T 2 / T 1 instead of signal intensities. However, independent of the degree of undersampling, a certain portion of the total acquisition time is dedicated to preparation phases to ensure that the individual steady states have been reached.…”

Section: Discussionmentioning

confidence: 99%

“…This choice is motivated by the rapid decay in magnitude of the bSSFP configuration modes with increasing order. 2,[16][17][18] As these modes (see [19][20][21][22] for analytical expressions) reflect the Fourier coefficients of a bSSFP spectrum, the low-frequency subspace represents spectra up to a maximum frequency. However, for this work, the most import property of this particular subspace is given by the shift theorem of the Fourier transform, which guaranties that time shifts of the signal response (as caused by local off-resonances) translate to linear phase terms in the subspace.…”

Section: Magnetic Resonance In Medicinementioning

confidence: 99%

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Frequency‐modulated SSFP with radial sampling and subspace reconstruction: A time‐efficient alternative to phase‐cycled bSSFP

Roeloffs

Rosenzweig

Holme

et al. 2018

Magnetic Resonance in Med

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Purpose A novel subspace‐based reconstruction method for frequency‐modulated balanced steady‐state free precession (fmSSFP) MRI is presented. In this work, suitable data acquisition schemes, subspace sizes, and efficiencies for banding removal are investigated. Theory and Methods By combining a fmSSFP MRI sequence with a 3D stack‐of‐stars trajectory, scan efficiency is maximized as spectral information is obtained without intermediate preparation phases. A memory‐efficient reconstruction routine is implemented by introducing the low‐frequency Fourier transform as a subspace which allows for the formulation of a convex reconstruction problem. The removal of banding artifacts is investigated by comparing the proposed acquisition and reconstruction technique to phase‐cycled bSSFP MRI. Aliasing properties of different undersampling schemes are analyzed and water/fat separation is demonstrated by reweighting the reconstructed subspace coefficients to generate virtual spectral responses in a post‐processing step. Results A simple root‐of‐sum‐of‐squares combination of the reconstructed subspace coefficients yields high‐SNR images with the characteristic bSSFP contrast but without banding artifacts. Compared to Golden‐Angle trajectories, turn‐based sampling schemes were superior in minimizing aliasing across reconstructed subspace coefficients. Water/fat separated images of the human knee were obtained by reweighting subspace coefficients. Conclusions The novel subspace‐based fmSSFP MRI technique emerges as a time‐efficient alternative to phase‐cycled bSFFP. The method does not need intermediate preparation phases, offers high SNR and avoids banding artifacts. Reweighting of the reconstructed subspace coefficients allows for generating virtual spectral responses with applications to water/fat separation.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Magnetic Resonance In Medicinementioning

confidence: 99%

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Frequency‐modulated SSFP with radial sampling and subspace reconstruction: A time‐efficient alternative to phase‐cycled bSSFP

Roeloffs

Rosenzweig

Holme

et al. 2018

Magnetic Resonance in Med

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“…The original paper proposed ESM as a method for N = 4. Higher number of phase-cycles are also used in both research 32,33,37,41,42 and practice. 43,44 In this paper, we simply extend ESM to N = 8 in the following way.…”

Section: Combination Based On the Elliptical Signal Model (Esm)mentioning

confidence: 99%

“…30,31 Despite the improved stability, methods based on the elliptical signal model require at least N ≥ 4 for reliable performance. This requirement is equally valid for recent techniques based on dictionary-based estimation 32 and multilayer perceptron-based (MLP) learning. 33 We also note several studies with the purpose of decreasing data acquisition time and/or the required number of phase-cycles for elliptical signal model [34][35][36] ; however reliable banding suppression with N < 4 remains a challenging task.…”

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confidence: 99%

Factorized sensitivity estimation for artifact suppression in phase‐cycled bSSFP MRI

et al. 2020

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Objective: Balanced steady‐state free precession (bSSFP) imaging suffers from banding artifacts in the presence of magnetic field inhomogeneity. The purpose of this study is to identify an efficient strategy to reconstruct banding‐free bSSFP images from multi‐coil multi‐acquisition datasets. Method: Previous techniques either assume that a naïve coil‐combination is performed a priori resulting in suboptimal artifact suppression, or that artifact suppression is performed for each coil separately at the expense of significant computational burden. Here we propose a tailored method that factorizes the estimation of coil and bSSFP sensitivity profiles for improved accuracy and/or speed. Results: In vivo experiments show that the proposed method outperforms naïve coil‐combination and coil‐by‐coil processing in terms of both reconstruction quality and time. Conclusion: The proposed method enables computationally efficient artifact suppression for phase‐cycled bSSFP imaging with modern coil arrays. Rapid imaging applications can efficiently benefit from the improved robustness of bSSFP imaging against field inhomogeneity.

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A multicontrast imaging method using steady‐state free precession with alternating RF flip angles

Kim

Seo

et al. 2018

Magnetic Resonance in Med

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True constructive interference in the steady state (trueCISS)

Abstract: TrueCISS offers banding-free bSSFP images with on-resonant signal intensity and without requiring additional acquisition time compared to conventional methods. Magn Reson Med 79:1901-1910, 2018. © 2017 International Society for Magnetic Resonance in Medicine.

Cited by 9 publications

References 31 publications

Frequency‐modulated SSFP with radial sampling and subspace reconstruction: A time‐efficient alternative to phase‐cycled bSSFP

Frequency‐modulated SSFP with radial sampling and subspace reconstruction: A time‐efficient alternative to phase‐cycled bSSFP

Factorized sensitivity estimation for artifact suppression in phase‐cycled bSSFP MRI

A multicontrast imaging method using steady‐state free precession with alternating RF flip angles

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