A Spiral Spin-Echo MR Imaging Technique for Improved Flow Artifact Suppression in T1-Weighted Postcontrast Brain Imaging: A Comparison with Cartesian Turbo Spin-Echo

Li, Zhiqiang; Hu, Hao; Miller, Jeffrey H; Karis, John P.; Cornejo, Patricia; Wang, Dinghui; Pipe, James G.

doi:10.3174/ajnr.a4600

Cited by 28 publications

(39 citation statements)

References 11 publications

(8 reference statements)

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“…24 Studies have shown the usability of spiral imaging in T1-weighted spin echo sequences. 25 Recently, it has been demonstrated that spiral imaging can be used to generate TOF-MRA sequences in a comparable amount of time when compared to TOF-MRA accelerated by compressed sensing. 26 Due to the inherent advantages of spiral imaging mentioned above, we hypothesize that it can markedly accelerate TOF-MRA, thereby outperforming other acceleration algorithms such as TOF-MRA accelerated by compressed sensing, with only minor drawbacks regarding coverage, spatial resolution, or diagnostic quality.…”

Section: Introductionmentioning

confidence: 99%

Novel Ultrafast Spiral Head MR Angiography Compared to Standard MR and CT Angiography

Greve

Sollmann

Höck³

et al. 2020

Journal of Neuroimaging

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Intracranial vessel imaging by time-of-flight MR angiography (TOF-MRA) is one of the most frequently performed investigations in clinical neuroradiology. Particularly in the acute setting, fast imaging is needed for diagnostics, with a sequence ideally depicting even small vessels. The purpose of this study was to compare image and diagnostic quality of a novel ultrashort TOF-MRA sequence accelerated by spiral imaging (TOF-Spiral-short) to a standard TOF-MRA sequence accelerated by compressed sensing (TOF-CS) and to CT angiography (CTA). METHODS: Forty-one patients (36.6% showing vessel pathologies) who had undergone TOF-CS (acquisition duration: 4 minutes 8 seconds), TOF-Spiral-short (acquisition duration: 51 seconds; spiral imaging [accelerating factor 1.3], decreased field of view [accelerating factor 1.2], and increased voxel size [accelerating factor 3.3]), and CTA were retrospectively evaluated. Assessment of image quality, diagnostic confidence, and quantification of stenosis or aneurysm diameter were performed by two readers. RESULTS: Image quality at the skull base was slightly reduced with TOF-Spiral-short compared to CTA and TOF-CS (P < .05). Delineation of small intracranial vessels was improved by TOF-Spiral-short compared to CTA (P < .0001). In TOF-Spiral-short, diagnostic confidence was not reduced compared to TOF-CS in patients with vessel pathologies. We observed no significant difference in quantitative pathology assessment between TOF-Spiral-short and the other two modalities. TOF-Spiral-short enabled the correct identification of all vessel pathologies. CONCLUSIONS: Accelerating TOF-MRA of brain-feeding arteries by a novel ultrashort spiral imaging sequence shows adequate image quality and sufficient diagnostic performance. Thus, TOF-Spiral-short holds potential for fast and reliable diagnostics of vessel pathologies, particularly in the acute setting.

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Section: Introductionmentioning

confidence: 99%

Novel Ultrafast Spiral Head MR Angiography Compared to Standard MR and CT Angiography

Greve

Sollmann

Höck³

et al. 2020

Journal of Neuroimaging

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“…Spiral MRI promises many benefits including high acquisition and SNR efficiency, short minimum echo‐times, robustness to motion and flow, and higher geometric fidelity (compared to EPI). In the past few years, spiral has been shown to provide unique capabilities or substantial advantages over conventional imaging in post‐Gad T 1 weighted imaging, 3D TSE imaging, cardiac flow imaging, diffusion weighted imaging, real‐time imaging, perfusion imaging, functional MRI, MR fingerprinting, and many other applications. Despite its potential and long history, spiral MRI has struggled to find widespread clinical adoption, in large part due to artifacts from susceptibility‐induced field inhomogeneity and eddy current‐induced gradient errors.…”

Section: Introductionmentioning

confidence: 99%

Correction of B₀ eddy current effects in spiral MRI

Robison

Wang

et al. 2018

Magnetic Resonance in Med

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Purpose B0 eddy currents are a subtle but important source of artifacts in spiral MRI. This study illustrates the importance of addressing these artifacts and presents a system response‐based eddy current correction strategy using B0 eddy current phase measurements on a phantom. Methods B0 and linear eddy current system response measurements were estimated from phantom‐based measurement and used to predict residual eddy current effects in spiral acquisitions. The measurements were evaluated across multiple systems and gradient sets. The corresponding eddy current corrections were studied in both axial spiral‐in/out TSE and sagittal spiral‐out MPRAGE volunteer data. Results Correction of B0 eddy currents using the proposed method mitigated blurriness in the axial spiral‐in/out images and artifacts in the sagittal spiral‐out images. The system response measurement was found to yield repeatable results over time with some variation in the B0 eddy current responses measured between different systems. Conclusions The proposed eddy current correction framework was effective in mitigating the effects of residual B0 and linear eddy currents. Any spiral acquisition should take residual eddy currents into account. This is particularly important in spiral‐in/out acquisitions.

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“…While the current work explores the use of in‐plane radial sampling, efficiency of the pulse sequence could be further improved using alternative non‐Cartesian trajectories such as spiral, GRASE or bent radial readout schemes . These trajectories would allow the acquisition of sufficient k‐space samples in a single shot, reducing further the scan time.…”

Section: Discussionmentioning

confidence: 99%

An efficient 3D stack‐of‐stars turbo spin echo pulse sequence for simultaneous T2‐weighted imaging and T2 mapping

Keerthivasan

Saranathan

Johnson

et al. 2019

Magnetic Resonance in Med

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Purpose:To design a pulse sequence for efficient 3D T2-weighted imaging and T2 mapping. Methods: A stack-of-stars turbo spin echo pulse sequence with variable refocusing flip angles and a flexible pseudorandom view ordering is proposed for simultaneous T2-weighted imaging and T2 mapping. An analytical framework is introduced for the selection of refocusing flip angles to maximize relative tissue contrast while minimizing T2 estimation errors and maintaining low specific absorption rate. Images at different echo times are generated using a subspace constrained iterative reconstruction algorithm. T2 maps are obtained by modeling the signal evolution using the extended phase graph model. The technique is evaluated using phantoms and demonstrated in vivo for brain, knee, and carotid imaging. Results: Numerical simulations demonstrate an improved point spread function with the proposed pseudorandom view ordering compared to golden angle view ordering. Phantom experiments show that T2 values estimated from the stack-of-stars turbo spin echo pulse sequence with variable refocusing flip angles have good concordance with spin echo reference values. In vivo results show the proposed pulse sequence can generate qualitatively comparable T2-weighted images as conventional Cartesian 3D SPACE in addition to simultaneously generating 3D T2 maps. Conclusion: The proposed stack-of-stars turbo spin echo pulse sequence with pseudorandom view ordering and variable refocusing flip angles allows high resolution isotropic T2 mapping in clinically acceptable scan times. The optimization framework for the selection of refocusing flip angles improves T2 estimation accuracy while generating T2-weighted contrast comparable to conventional Cartesian imaging. K E Y W O R D S 3D T2 mapping, stack-of-stars, turbo spin echo, variable refocusing flip angles | 327 KEERTHIVASAN ET Al.

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A Spiral Spin-Echo MR Imaging Technique for Improved Flow Artifact Suppression in T1-Weighted Postcontrast Brain Imaging: A Comparison with Cartesian Turbo Spin-Echo

Cited by 28 publications

References 11 publications

Novel Ultrafast Spiral Head MR Angiography Compared to Standard MR and CT Angiography

Novel Ultrafast Spiral Head MR Angiography Compared to Standard MR and CT Angiography

Correction of B₀ eddy current effects in spiral MRI

An efficient 3D stack‐of‐stars turbo spin echo pulse sequence for simultaneous T2‐weighted imaging and T2 mapping

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A Spiral Spin-Echo MR Imaging Technique for Improved Flow Artifact Suppression in T1-Weighted Postcontrast Brain Imaging: A Comparison with Cartesian Turbo Spin-Echo

Cited by 28 publications

References 11 publications

Novel Ultrafast Spiral Head MR Angiography Compared to Standard MR and CT Angiography

Novel Ultrafast Spiral Head MR Angiography Compared to Standard MR and CT Angiography

Correction of B0 eddy current effects in spiral MRI

An efficient 3D stack‐of‐stars turbo spin echo pulse sequence for simultaneous T2‐weighted imaging and T2 mapping

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Product

Resources

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Correction of B₀ eddy current effects in spiral MRI