A within‐coil optical prospective motion‐correction system for brain imaging at 7T

DiGiacomo, Phillip; Maclaren, Julian; Aksoy, Murat; Tong, Elizabeth; Carlson, Mackenzie; Lanzman, Bryan; Hashmi, Syed; Watkins, Ronald D.; Rosenberg, Jarrett; Burns, Brian; Skloss, Timothy W.; Rettmann, Dan; Rutt, Brian K.; Bammer, Roland; Zeineh, Michael

doi:10.1002/mrm.28211

Cited by 15 publications

(11 citation statements)

References 40 publications

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“…51 Even small movements or breathing will create artifacts in susceptibility sensitive techniques such as T 2 *-weighted sequences or echo planar imaging (EPI). 52 Several retrospective and prospective correction methods have been suggested, and although promising, tracking of optical markers 53 or NMR-active probes 54 can be challenging because of the tight space in standard head coils and require a workflow impractical for clinical use. Alternatively, methods based on embedding fat-selective navigators 55 or phase navigators 56 into sequence designs have been successfully used in a variety of applications.…”

Section: Motion Correctionmentioning

confidence: 99%

7T Epilepsy Task Force Consensus Recommendations on the Use of 7T MRI in Clinical Practice

Opheim

Kolk²,

Bloch³

et al. 2021

Neurology

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Identifying a structural brain lesion on MRI has important implications in epilepsy and is the most important correlate to seizure freedom after surgery in patients with drug-resistant focal onset epilepsy. However, at conventional magnetic field strengths (1.5 and 3T) only around 60-85% of MRI examinations reveal such lesions. Over the last decade, studies have demonstrated the added value of 7T MRI in patients with and without known epileptogenic lesions from 1.5 and/or 3T. However, translation of 7T MRI to clinical practice is still challenging, particularly in centers new to 7T, and there is a need for practical recommendations on targeted use of 7T MRI in the clinical management of patients with epilepsy. The 7T Epilepsy Task Force - an international group representing 21 7T MRI centers with experience from scanning over 2000 patients with epilepsy – would hereby like to share its experience with the neurology community regarding the appropriate clinical indications, patient selection and preparation, acquisition protocols and setup, technical challenges, and radiological guidelines for 7T MRI in epilepsy patients. This article mainly addresses structural imaging, but also presents multiple non-structural MRI techniques that benefit from 7T and hold promise as future directions in epilepsy. Answering to the increased availability of 7T MRI as an approved tool for diagnostic purposes, this article aims to give guidance on clinical 7T MRI epilepsy management by giving recommendations on referral, suitable 7T MRI protocols and image interpretation.

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Section: Motion Correctionmentioning

confidence: 99%

7T Epilepsy Task Force Consensus Recommendations on the Use of 7T MRI in Clinical Practice

Opheim

Kolk²,

Bloch³

et al. 2021

Neurology

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“…In addition, the usage of CAM can be applied to other (imaging) modalities as well, e.g., home care vital sign monitoring. 19 Several studies have been published on contact-free physiological monitoring, [32][33][34][35][36][37] but they did not focus on cardiac 4D flow MRI. Harder et al compared the same camera type and setup (abdominal imaging) to existing respiratory gating methods and reported that camera-based respiratory triggering (prospective gating) significantly improved image quality of 3D cholangiopancreatography images compared to conventional respiratory belt triggering.…”

Section: Discussionmentioning

confidence: 99%

Retrospective Camera‐Based Respiratory Gating in Clinical Whole‐Heart 4D Flow MRI

Gottwald

Blanken

Tourais

et al. 2021

Magnetic Resonance Imaging

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Background: Respiratory gating is generally recommended in 4D flow MRI of the heart to avoid blurring and motion artifacts. Recently, a novel automated contact-less camera-based respiratory motion sensor has been introduced. Purpose: To compare camera-based respiratory gating (CAM) with liver-lung-navigator-based gating (NAV) and no gating (NO) for whole-heart 4D flow MRI. Study Type: Retrospective. Subjects: Thirty two patients with a spectrum of cardiovascular diseases. Field Strength/Sequence: A 3T, 3D-cine spoiled-gradient-echo-T1-weighted-sequence with flow-encoding in three spatial directions. Assessment: Respiratory phases were derived and compared against each other by cross-correlation. Three radiologists/ cardiologist scored images reconstructed with camera-based, navigator-based, and no respiratory gating with a 4-point Likert scale (qualitative analysis). Quantitative image quality analysis, in form of signal-to-noise ratio (SNR) and liver-lungedge (LLE) for sharpness and quantitative flow analysis of the valves were performed semi-automatically. Statistical Tests: One-way repeated measured analysis of variance (ANOVA) with Wilks's lambda testing and follow-up pairwise comparisons. Significance level of P ≤ 0.05. Krippendorff's-alpha-test for inter-rater reliability. Results: The respiratory signal analysis revealed that CAM and NAV phases were highly correlated (C = 0.93 ± 0.09, P < 0.01). Image scoring showed poor inter-rater reliability and no significant differences were observed (P ≥ 0.16). The image quality comparison showed that NAV and CAM were superior to NO with higher SNR (P = 0.02) and smaller LLE (P < 0.01). The quantitative flow analysis showed significant differences between the three respiratory-gated reconstructions in the tricuspid and pulmonary valves (P ≤ 0.05), but not in the mitral and aortic valves (P > 0.05). Pairwise comparisons showed that reconstructions without respiratory gating were different in flow measurements to either CAM or NAV or both, but no differences were found between CAM and NAV reconstructions. Data Conclusion: Camera-based respiratory gating performed as well as conventional liver-lung-navigator-based respiratory gating. Quantitative image quality analysis showed that both techniques were equivalent and superior to no-gatingreconstructions. Quantitative flow analysis revealed local flow differences (tricuspid/pulmonary valves) in images of no-gating-reconstructions, but no differences were found between images reconstructed with camera-based and navigatorbased respiratory gating. Level of Evidence: 3 Technical Efficacy: Stage 2

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“… 158 Also, novel coil designs with built-in camera to track an optical marker have been used to overcome subject motion during scanning. 159 …”

Section: New Horizons In Ultra-high-field Imagingmentioning

confidence: 99%

New Prospects for Ultra-High-Field Magnetic Resonance Imaging in Multiple Sclerosis

et al. 2021

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There is growing interest in imaging multiple sclerosis (MS) through the ultra-high-field (UHF) lens, which currently means a static magnetic field strength of 7 T or higher. Because of higher signal-to-noise ratio and enhanced susceptibility effects, UHF magnetic resonance imaging improves conspicuity of MS pathological hallmarks, among them cortical demyelination and the central vein sign. This could, in turn, improve confidence in MS diagnosis and might also facilitate therapeutic monitoring of MS patients. Furthermore, UHF imaging offers unique insight into iron-related pathology, leptomeningeal inflammation, and spinal cord pathologies in neuroinflammation. Yet, limitations such as the longer scanning times to achieve improved resolution and incipient safety data on implanted medical devices need to be considered. In this review, we discuss applications of UHF imaging in MS, its advantages and limitations, and practical aspects of UHF in the clinical setting.

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A within‐coil optical prospective motion‐correction system for brain imaging at 7T

Cited by 15 publications

References 40 publications

7T Epilepsy Task Force Consensus Recommendations on the Use of 7T MRI in Clinical Practice

7T Epilepsy Task Force Consensus Recommendations on the Use of 7T MRI in Clinical Practice

Retrospective Camera‐Based Respiratory Gating in Clinical Whole‐Heart 4D Flow MRI

New Prospects for Ultra-High-Field Magnetic Resonance Imaging in Multiple Sclerosis

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