scholarly journals Development and evaluation of a 16‐channel receive‐only RF coil to improve 7T ultra‐high field body MRI with focus on the spine

2019 ◽  
Vol 82 (2) ◽  
Keyword(s):  
Rf Coil ◽  
2007 ◽  
Vol 6 (4) ◽  
pp. 231-233 ◽  
Author(s):  
Manabu NAKAJIMA ◽  
Iwao NAKAJIMA ◽  
Shigeru OBAYASHI ◽  
Yuji NAGAI ◽  
Takayuki OBATA ◽  
...  

2021 ◽  
Author(s):  
Kyle M Gilbert ◽  
Paul Dubovan ◽  
Joseph S Gati ◽  
Ravi S Menon ◽  
Corey A Baron

Purpose: To develop an RF coil with an integrated commercial field camera for ultra-high field (7 T) neuroimaging. The RF coil will operate within a head-only gradient coil and be subject to the corresponding design constraints. The RF coil can thereafter be used for subject-specific correction of k-space trajectories-notably in gradient-sensitive sequences such as single-shot spiral imaging. Methods: The transmit and receive performance was evaluated before and after the integration of field probes, while field probes were evaluated when in an optimal configuration external to the coil and after their integration. Diffusion-weighted EPI and single-shot spiral acquisitions were employed to evaluate the efficacy of correcting higher order field perturbations and the consequent effect on image quality. Results: Field probes had a negligible effect on RF-coil performance, including the transmit efficiency, transmit uniformity, and mean SNR over the brain. Modest reductions in field-probe signal lifetimes were observed, caused primarily by non-idealities in the gradient and shim fields of the head-only gradient coil at the probe positions. The field monitoring system could correct up to second-order field perturbations in single-shot spiral imaging. Conclusion: The integrated RF coil and field camera was capable of concurrent field monitoring within a 7T head-only scanner and facilitated the subsequent correction of k-space trajectories during spiral imaging.


2016 ◽  
Vol 29 (12) ◽  
pp. 1768-1779 ◽  
Author(s):  
Shailesh B. Raval ◽  
Tiejun Zhao ◽  
Narayanan Krishnamurthy ◽  
Tales Santini ◽  
Cynthia Britton ◽  
...  

2019 ◽  
Vol 82 (2) ◽  
pp. 796-810 ◽  
Author(s):  
Stefan H. G. Rietsch ◽  
Sascha Brunheim ◽  
Stephan Orzada ◽  
Maximilian N. Voelker ◽  
Stefan Maderwald ◽  
...  
Keyword(s):  
Rf Coil ◽  

2020 ◽  
Vol 4 (1) ◽  
Author(s):  
Nicolo’ Bruschi ◽  
Giacomo Boffa ◽  
Matilde Inglese

Abstract Magnetic resonance imaging (MRI) is essential for the early diagnosis of multiple sclerosis (MS), for investigating the disease pathophysiology, and for discriminating MS from other neurological diseases. Ultra-high-field strength (7-T) MRI provides a new tool for studying MS and other demyelinating diseases both in research and in clinical settings. We present an overview of 7-T MRI application in MS focusing on increased sensitivity and specificity for lesion detection and characterisation in the brain and spinal cord, central vein sign identification, and leptomeningeal enhancement detection. We also discuss the role of 7-T MRI in improving our understanding of MS pathophysiology with the aid of metabolic imaging. In addition, we present 7-T MRI applications in other demyelinating diseases. 7-T MRI allows better detection of the anatomical, pathological, and functional features of MS, thus improving our understanding of MS pathology in vivo. 7-T MRI also represents a potential tool for earlier and more accurate diagnosis.


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