7 Tesla 22‐channel wrap‐around coil array for cervical spinal cord and brainstem imaging

Zhang, Bei; Seifert, Alan C.; Kim, Joo Won; Borrello, Joseph A.; Xu, Junqian

doi:10.1002/mrm.26538

Cited by 34 publications

(42 citation statements)

References 34 publications

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“…Major imaging challenges exist, however, such as magnetic field inhomogeneity and increased vulnerability to physiological motion – hindering the imaging modality’s potential to transition into the clinic. Fortunately, the advent of cutting edge shimming methods (20–22) and pulse sequences (23,24) that are optimized for spinal imaging has led to a body of recent research which suggest that detecting neural activity in the spinal cord using spinal fMRI may not only be feasible, but also reliable (13,14,32,33). Furthermore, the technical advances in the field have also enabled the application of rsfMRI in the spinal cord, allowing the use of an identical imaging protocol for all study participants regardless of their degree of cognitive or physical limitations.…”

Section: Discussionmentioning

confidence: 99%

“…Fortunately, such image artifacts can be reduced by adopting advanced shimming methods (20–22) and pulse sequences (23,24) that are optimized for spinal imaging. One can also attempt to minimize the magnetic field variation within the imaging field of view itself by obtaining transverse imaging slices – i.e., by placing the imaging plane parallel to the spinal cord’s cross-section.…”

Section: Task-activated Functional Magnetic Resonance Imaging In the mentioning

confidence: 99%

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Advances in Spinal Functional Magnetic Resonance Imaging in the Healthy and Injured Spinal Cords

Choe

2017

Curr Phys Med Rehabil Rep

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Purpose of Review This review provides an overview of the current spinal functional magnetic resonance imaging (fMRI) studies that investigate the healthy and injured spinal cords. Recent Findings Spinal fMRI-derived outcome measures have previously been suggested to be sensitive to changes in neurological function in the spinal cord. A body of recent task-activated fMRI studies seems to confirm that detecting neural activity in the spinal cord using spinal fMRI may be feasible as well as reliable. Furthermore, a growing number of studies has shown that resting state fMRI in the spinal cord is also feasible, demonstrating that the investigation of changes in neural activity can also be performed in the absence of explicit tasks. Summary Current task-activated and resting state fMRI studies suggest that spinal fMRI has a strong potential to provide novel imaging biomarkers that can be used to investigate plastic changes in the injured spinal cord.

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Section: Discussionmentioning

confidence: 99%

Section: Task-activated Functional Magnetic Resonance Imaging In the mentioning

confidence: 99%

Advances in Spinal Functional Magnetic Resonance Imaging in the Healthy and Injured Spinal Cords

Choe

2017

Curr Phys Med Rehabil Rep

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“…While T2* is therefore challenging at ultrahigh field, it is also of particular interest in the spine. In structural imaging, T2*‐weighting provides excellent gray/white matter contrast in the spine and it is also the contrast underlying blood‐oxygen‐level‐dependent functional imaging. We therefore implement the correction for high‐resolution multi‐echo gradient‐echo acquisitions, used for structural imaging and quantitative T2* mapping, and time series of multi‐shot EPI images, intended for functional imaging.…”

Section: Introductionmentioning

confidence: 99%

A method for correcting breathing‐induced field fluctuations in T2*‐weighted spinal cord imaging using a respiratory trace

Vannesjo

Clare

Kasper

et al. 2019

Magnetic Resonance in Med

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Purpose Spinal cord MRI at ultrahigh field is hampered by time‐varying magnetic fields associated with the breathing cycle, giving rise to ghosting artifacts in multi‐shot acquisitions. Here, we suggest a correction approach based on linking the signal from a respiratory bellows to field changes inside the spinal cord. The information is used to correct the data at the image reconstruction level. Methods The correction was demonstrated in the context of multi‐shot T2*‐weighted imaging of the cervical spinal cord at 7T. A respiratory trace was acquired during a high‐resolution multi‐echo gradient‐echo sequence, used for structural imaging and quantitative T2* mapping, and a multi‐shot EPI time series, as would be suitable for fMRI. The coupling between the trace and the breathing‐induced fields was determined by a short calibration scan in each individual. Images were reconstructed with and without trace‐based correction. Results In the multi‐echo acquisition, breathing‐induced fields caused severe ghosting in images with long TE, which led to a systematic underestimation of T2* in the spinal cord. The trace‐based correction reduced the ghosting and increased the estimated T2* values. Breathing‐related ghosting was also observed in the multi‐shot EPI images. The correction largely removed the ghosting, thereby improving the temporal signal‐to‐noise ratio of the time series. Conclusions Trace‐based retrospective correction of breathing‐induced field variations can reduce ghosting and improve quantitative metrics in multi‐shot structural and functional T2*‐weighted imaging of the spinal cord. The method is straightforward to implement and does not rely on sequence modifications or additional hardware beyond a respiratory bellows.

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“…Recently, some array designs have been proposed for the CSC imaging at 3T MRI systems. [22][23][24][25][26] The coil designs for the higher field include a 4-channel array for the CSC, 24 an 8-channel array for the entire vertebral column, 25 a 19-channel array for the CSC, 26 and a 22-channel array with the elements wrapping around the neck. 16 With the increasing interest in the higher field, in the past few years, there have been a few CSC array designs proposed for the 7T MRI systems as well.…”

Section: Introductionmentioning

confidence: 99%

“…[16][17][18][19][20][21] These include a 4-channel planar array for thoracic and lumbar spine, 20 an 8-channel array for CSC, 19 a 16-channel array for the head and neck, 17 a 16-channel SENSE optimized array for CSC, 18 a 32-channel array optimized for brain and CSC, 21 and a 64-channel array for head/neck/CSC. 22 All these previous designs rely on the preamp decoupling to reduce the coupling between non-adjacent elements. [22][23][24][25][26] The coil designs for the higher field include a 4-channel array for the CSC, 24 an 8-channel array for the entire vertebral column, 25 a 19-channel array for the CSC, 26 and a 22-channel array with the elements wrapping around the neck.…”

Section: Introductionmentioning

confidence: 99%

Eight‐channel decoupled array for cervical spinal cord imaging at 3T: six‐channel posterior and two‐channel anterior array coil

Sapkota

Thapa

Lee

et al. 2016

Concepts Magn Reson

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The purpose of this study was to develop a dedicated high signal-to-noise ratio (SNR) radio frequency coil for cervical spinal cord (CSC) imaging without using the preamp decoupling technique. A novel eight-channel CSC array was constructed using butterfly, loop (circular), and rectangular elements. The adjacent elements were decoupled by the critical geometrical overlapping, and most non-adjacent elements were decoupled using the loop and butterfly elements. The performance of the proposed CSC coil was compared with the performance of the standard manufacturer's coil (Siemens' head, neck, and spine array) at 3T MRI system in T 2 -weighted images, diffusion tensor images, and ultrahighb diffusion-weighted images. In T 2 -weighted images, the SNR improvement of the eight-channel CSC coil was 1.4-2.0 times over the manufacturer's coil at the different levels of the CSC vertebrae. Higher contrast between white matter and gray matter was observed in the diffusion-weighted ( b = 500 s/mm 2 ) images and the fractional anisotropy maps obtained using the eightchannel CSC coil compared with the manufacturer's coil. The eight-channel CSC coil yielded 2.0 times higher SNR compared with the manufacturer's coil from the white matter region of the ultrahighb ( b = 7348 s/mm 2 ) radial diffusion-weighted images. K E Y W O R D Scervical spinal cord , decoupling , preamp decoupling , receive-only array , RF coil

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7 Tesla 22‐channel wrap‐around coil array for cervical spinal cord and brainstem imaging

Cited by 34 publications

References 34 publications

Advances in Spinal Functional Magnetic Resonance Imaging in the Healthy and Injured Spinal Cords

Advances in Spinal Functional Magnetic Resonance Imaging in the Healthy and Injured Spinal Cords

A method for correcting breathing‐induced field fluctuations in T2*‐weighted spinal cord imaging using a respiratory trace

Eight‐channel decoupled array for cervical spinal cord imaging at 3T: six‐channel posterior and two‐channel anterior array coil

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