Motion‐insensitive susceptibility weighted imaging

Berglund, Johan; Sprenger, Tim; Niekerk, Adam van; Rydén, Henric; Avventi, Enrico; Norbeck, Ola; Skare, Stefan

doi:10.1002/mrm.28850

Cited by 6 publications

(9 citation statements)

References 45 publications

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“…Specifically, we observed reduced blurring and ringing, as well as enhanced contrast, for the sequences T1 MPR, T2 FLAIR, T2 TSE, T1 STIR and the TRACEweighted DWI. As shown in Figure 3g, the T2* sequence could not be corrected, as expected based on the sensitivity of long TE sequences to motion-related B0 changes [38,39]. These examples are representative for the observations in all participants, only the residual amount of ringing in the T1 STIR scans varied substantially from participant to participant.…”

Section: Image Examplessupporting

confidence: 61%

“…Without intentional head motion, quality was slightly reduced for scans with PMC relative to uncorrected scans, but scans with PMC were still of sufficient diagnostic quality. The motion sensitive T2*-weighted sequence could not be improved and a modified approach is required to deal with the motion-related B0 changes [38,39]. The acquisition time of the proposed protocol is comparable with the clinical standard and the whole protocol can be acquired in less than 20 minutes.…”

Section: Discussionmentioning

confidence: 99%

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Evaluating the performance of markerless prospective motion correction and selective reacquisition in a general clinical protocol for brain MRI

Eichhorn¹,

Frost²,

Kongsgaard³

et al. 2022

Preprint

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Objective: Head motion is one of the most common sources of artefacts in brain MRI. When imaging young children, general anaesthesia is common, which is a limited resource. We evaluate the performance of markerless prospective motion correction (PMC) and selective reacquisition in a complete clinical protocol for brain MRI, comparing acquisitions with and without instructed intentional head motion.Materials and Methods: Image quality metrics and ratings were analysed for scans with and without PMC - acquired with six 2D- and 3D-encoded sequences in twenty-two healthy adults. The influence of PMC on motion-artefact-related changes in cortical thickness estimates was quantified using a general linear model.Results: For the motion-degraded 3D-encoded MPR and FLAIR sequences, image quality increased with PMC and reacquisition (p<0.001, corrected). Motionless scans with PMC showed slightly reduced (p < 0.05, corrected), but still diagnostic image quality. Cortical thickness estimates were widely correlated with motion level in the uncorrected scans (p<0.05), which was not apparent to the same extent in PMC scans. For the motion-degraded 2D-encoded TSE, STIR and DWI sequences we observed higher image quality with PMC and reacquisition (p<0.001, corrected), though the effect size varied. We did not observe an improvement in the T2* sequence (p>0.05, corrected), which is known to be sensitive to motion-related changes in B0. Discussion: Using PMC and selective reacquisition in sequences for standard clinical brain MRI improves diagnostic image quality when there is head motion.

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Section: Image Examplessupporting

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Evaluating the performance of markerless prospective motion correction and selective reacquisition in a general clinical protocol for brain MRI

Eichhorn¹,

Frost²,

Kongsgaard³

et al. 2022

Preprint

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“…46 Regarding the T2*w contrast, sequential multishot 2D-EPI is a promising technique to reduce distortions and increase the resolution while preserving the motion robustness. 47 Simultaneous multislice could also be considered, as it has been shown to improve the efficiency of 2D sequences. 48 Although the SSFSE readouts would likely run into SAR limits, simultaneous multislice is suitable to increase the scan efficiency of T2w FSE.…”

Section: Discussionmentioning

confidence: 99%

“…An alternative option is a snapshot 2D‐MPRAGE readout, which has proven to be very motion robust 46 . Regarding the T2*w contrast, sequential multishot 2D‐EPI is a promising technique to reduce distortions and increase the resolution while preserving the motion robustness 47 . Simultaneous multislice could also be considered, as it has been shown to improve the efficiency of 2D sequences 48 .…”

Section: Discussionmentioning

confidence: 99%

NeuroMix—A single‐scan brain exam

Sprenger

Kits

Norbeck

et al. 2021

Magnetic Resonance in Med

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“…[19][20][21] The mismatch of motion-induced background phase between shots can then result in significant aliasing artifacts and signal cancellation. [22][23][24][25][26][27][28] Reconstruction schemes to correct for artifacts due to such intershot background phase variations have been proposed and fall into 3 categories: (i) methods that rely on a navigator for an explicit estimation of motion-induced phase 11,[29][30][31] ; (ii) methods that estimate the intershot phase from the data itself 13,14,26,[32][33][34] ; and (iii) methods that use structured low-rank matrix completion algorithms 15,35 or locally low-rank constrained reconstructions 27 without an explicit estimation of the motion-induced phase. Because phase navigation methods require additional scan time and may not accurately capture the instantaneous bulk motions during the diffusion scans, estimating phase from the data itself is a more attractive option.…”

Section: Introductionmentioning

confidence: 99%

High‐resolution multi‐shot diffusion‐weighted MRI combining markerless prospective motion correction and locally low‐rank constrained reconstruction

Chen

Dai

Zhong

et al. 2022

Magnetic Resonance in Med

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Subject head motion is a major challenge in DWI, leading to image blurring, signal losses, and biases in the estimated diffusion parameters. Here, we investigate a combined application of prospective motion correction and spatial-angular locally low-rank constrained reconstruction to obtain robust, multi-shot, high-resolution diffusion-weighted MRI under substantial motion.Methods: Single-shot EPI with retrospective motion correction can mitigate motion artifacts and resolve any mismatching of gradient encoding orientations; however, it is limited by low spatial resolution and image distortions. Multi-shot acquisition strategies could achieve higher resolution and image fidelity but increase the vulnerability to motion artifacts and phase variations related to cardiac pulsations from shot to shot. We use prospective motion correction with optical markerless motion tracking to remove artifacts and reduce image blurring due to bulk motion, combined with locally low-rank regularization to correct for remaining artifacts due to shot-to-shot phase variations. Results:The approach was evaluated on healthy adult volunteers at 3 Tesla under different motion patterns. In multi-shot DWI, image blurring due to motion with 20 mm translations and 30 • rotations was successfully removed by prospective motion correction, and aliasing artifacts caused by shot-to-shot phase variations were addressed by locally low-rank regularization. The ability of prospective motion correction to preserve the orientational information in DTI without requiring a reorientation of the b-matrix is highlighted. Conclusion:The described technique is proved to hold valuable potential for mapping brain diffusivity and connectivity at high resolution for studies in subjects/cohorts where motion is common, including neonates, pediatrics, and patients with neurological disorders.

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Motion‐insensitive susceptibility weighted imaging

Abstract: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Cited by 6 publications

References 45 publications

Evaluating the performance of markerless prospective motion correction and selective reacquisition in a general clinical protocol for brain MRI

Evaluating the performance of markerless prospective motion correction and selective reacquisition in a general clinical protocol for brain MRI

NeuroMix—A single‐scan brain exam

High‐resolution multi‐shot diffusion‐weighted MRI combining markerless prospective motion correction and locally low‐rank constrained reconstruction

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