Reducing slab boundary artifacts in three‐dimensional multislab diffusion MRI using nonlinear inversion for slab profile encoding (NPEN)

Wu, Wenchuan; Koopmans, Peter J.; Frost, Robert; Miller, Karla L.

doi:10.1002/mrm.26027

Cited by 37 publications

(84 citation statements)

References 56 publications

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“…The method for correcting slab boundary artefacts using NPEN has been described previously (Wu et al, 2015). In short: NPEN formulates the 3D multi-slab acquisition as a nonlinear inversion problem, where both the slab profiles and the underlying images are treated as unknowns and solved using iterative methods.…”

Section: Methodsmentioning

confidence: 99%

“…Initial estimations are required for nonlinear inversion, which was previously based on the b =0 image (Wu et al, 2015). A potential drawback of this method is that if the B 0 field is very inhomogeneous, the slab profile can be locally distorted and shifted, and as a result, the initial 3D slab profile estimated from the averaged signal within slice may not be suitable at all slice locations, which can lead to biased reconstructions.…”

Section: Methodsmentioning

confidence: 99%

“…Second, 3D multi-slab exhibits slab boundary artefacts because the edges of the slab profiles cannot be perfectly sharp and abutting, resulting in periodic signal modulations due to saturation at the boundaries and slab aliasing (Van et al, 2015, Wu et al, 2015). A number of methods for reducing these artefacts have been proposed (Oshio et al, 1991, Parker et al, 1991, Murakami et al, 1995, Van et al, 2011, Engstrom and Skare, 2013, Frost et al, 2014, Chang et al, 2015), all of which increase scan time due to oversampling/overlapping of slabs, and often require a longer TR to reduce the saturation effects at slab boundaries (Engstrom et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…A number of methods for reducing these artefacts have been proposed (Oshio et al, 1991, Parker et al, 1991, Murakami et al, 1995, Van et al, 2011, Engstrom and Skare, 2013, Frost et al, 2014, Chang et al, 2015), all of which increase scan time due to oversampling/overlapping of slabs, and often require a longer TR to reduce the saturation effects at slab boundaries (Engstrom et al, 2015). The slab profile encoding (PEN) method (Van et al, 2015) can correct the aliasing artefacts with minimal increase in scan time (except for a calibration scan), but exhibits residual artefacts below TR~4 s (Wu et al, 2015). We recently proposed the nonlinear slab profile encoding (NPEN) extension, which corrects both slab aliasing and signal modulations, while being compatible with optimal TR (Wu et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…The slab profile encoding (PEN) method (Van et al, 2015) can correct the aliasing artefacts with minimal increase in scan time (except for a calibration scan), but exhibits residual artefacts below TR~4 s (Wu et al, 2015). We recently proposed the nonlinear slab profile encoding (NPEN) extension, which corrects both slab aliasing and signal modulations, while being compatible with optimal TR (Wu et al, 2015). The performance of NPEN correction has already been demonstrated at 3T; here, NPEN is applied at 7T to reduce the slab boundary artefacts for 3D multi-slab diffusion MRI.…”

Section: Introductionmentioning

confidence: 99%

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High-resolution diffusion MRI at 7T using a three-dimensional multi-slab acquisition

Poser

Douaud

et al. 2016

NeuroImage

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High-resolution diffusion MRI can provide the ability to resolve small brain structures, enabling investigations of detailed white matter architecture. A major challenge for in vivo high-resolution diffusion MRI is the low signal-to-noise ratio. In this work, we combine two highly compatible methods, ultra-high field and three-dimensional multi-slab acquisition to improve the SNR of high-resolution diffusion MRI. As each kz plane is encoded using a single-shot echo planar readout, scan speeds of the proposed technique are similar to the commonly used two-dimensional diffusion MRI. In-plane parallel acceleration is applied to reduce image distortions. To reduce the sensitivity of auto-calibration signal data to subject motion and respiration, several new adaptions of the fast low angle excitation echo-planar technique (FLEET) that are suitable for 3D multi-slab echo planar imaging are proposed and evaluated. A modified reconstruction scheme is proposed for auto-calibration with the most robust method, Slice-FLEET acquisition, to make it compatible with navigator correction of motion induced phase errors. Slab boundary artefacts are corrected using the nonlinear slab profile encoding method recently proposed by our group. In vivo results demonstrate that using 7T and three-dimensional multi-slab acquisition with improved auto-calibration signal acquisition and nonlinear slab boundary artefacts correction, high-quality diffusion MRI data with ~1 mm isotropic resolution can be achieved.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

High-resolution diffusion MRI at 7T using a three-dimensional multi-slab acquisition

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Douaud

et al. 2016

NeuroImage

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Image formation in diffusion MRI: A review of recent technical developments

Miller

2017

Magnetic Resonance Imaging

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105

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Diffusion magnetic resonance imaging (MRI) is a standard imaging tool in clinical neurology, and is becoming increasingly important for neuroscience studies due to its ability to depict complex neuroanatomy (eg, white matter connectivity). Single‐shot echo‐planar imaging is currently the predominant formation method for diffusion MRI, but suffers from blurring, distortion, and low spatial resolution. A number of methods have been proposed to address these limitations and improve diffusion MRI acquisition. Here, the recent technical developments for image formation in diffusion MRI are reviewed. We discuss three areas of advance in diffusion MRI: improving image fidelity, accelerating acquisition, and increasing the signal‐to‐noise ratio. Level of Evidence: 5 Technical Efficacy: Stage 1J. MAGN. RESON. IMAGING 2017;46:646–662

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High‐resolution in vivo diffusion imaging of the human brain with generalized slice dithered enhanced resolution: Simultaneous multislice (gSlider‐SMS)

Setsompop

Fan

Stockmann

et al. 2017

Magnetic Resonance in Med

142

182

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Purpose To develop an efficient acquisition for high‐resolution diffusion imaging and allow in vivo whole‐brain acquisitions at 600‐ to 700‐μm isotropic resolution. Methods We combine blipped‐controlled aliasing in parallel imaging simultaneous multislice (SMS) with a novel slab radiofrequency (RF) encoding gSlider (generalized slice‐dithered enhanced resolution) to form a signal‐to‐noise ratio–efficient volumetric simultaneous multislab acquisition. Here, multiple thin slabs are acquired simultaneously with controlled aliasing, and unaliased with parallel imaging. To achieve high resolution in the slice direction, the slab is volumetrically encoded using RF encoding with a scheme similar to Hadamard encoding. However, with gSlider, the RF‐encoding bases are specifically designed to be highly independent and provide high image signal‐to‐noise ratio in each slab acquisition to enable self‐navigation of the diffusion's phase corruption. Finally, the method is combined with zoomed imaging (while retaining whole‐brain coverage) to facilitate low‐distortion single‐shot in‐plane encoding with echo‐planar imaging at high resolution. Results A 10‐slices‐per‐shot gSlider‐SMS acquisition was used to acquire whole‐brain data at 660 and 760 μm isotropic resolution with b‐values of 1500 and 1800 s/mm2, respectively. Data were acquired on the Connectome 3 Tesla scanner with 64‐channel head coil. High‐quality data with excellent contrast were achieved at these resolutions, which enable the visualization of fine‐scale structures. Conclusions The gSlider‐SMS approach provides a new, efficient way to acquire high‐resolution diffusion data. Magn Reson Med 79:141–151, 2018. © 2017 International Society for Magnetic Resonance in Medicine.

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Reducing slab boundary artifacts in three‐dimensional multislab diffusion MRI using nonlinear inversion for slab profile encoding (NPEN)

Cited by 37 publications

References 56 publications

High-resolution diffusion MRI at 7T using a three-dimensional multi-slab acquisition

High-resolution diffusion MRI at 7T using a three-dimensional multi-slab acquisition

Image formation in diffusion MRI: A review of recent technical developments

High‐resolution in vivo diffusion imaging of the human brain with generalized slice dithered enhanced resolution: Simultaneous multislice (gSlider‐SMS)

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