Publication date: July 2017
Source:Magnetic Resonance Imaging, Volume 40
Author(s): Konstantinos Papoutsis, Linqing Li, Jamie Near, Stephen Payne, Peter Jezzard
Atherosclerotic plaques in the bifurcation of the carotid arteries can pose a significant health risk due to possible plaque rupture and subsequent stroke. The assessment of plaques, and evaluation of the risk they pose, can be performed with Black-Blood (BB) vessel wall magnetic resonance imaging. However, resolution at standard clinical field strengths (up to 3T) is limited, hampering reliable assessment and diagnosis. The aim of this study was to investigate the benefits of 7T MRI using a BB application that has been successful at clinical field strengths. Therefore, for BB imaging, each sequence was preceded with 'Delay Alternating with Nutation for Tailored Excitation' (DANTE) preparation pulses for blood signal suppression. A coil comprising a 4-channel Tx array was designed and built to provide the required excitation coverage for the DANTE train; and a 4-channel Rx array was constructed to target the carotid bifurcation. Human and phantom results showed satisfactory blood suppression and comparable SNR and CNR to 3T, therefore demonstrating the feasibility of the application at 7T. However, the imposed SAR restrictions led to long scan times and subsequent motion artifacts. Thus, more accurate local SAR supervision schemes are required which could lead to a further improvement of BB DANTE vessel wall imaging at 7T.
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ΩτοΡινοΛαρυγγολόγος
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00302841026182
00306932607174
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- Striatal dopaminergic modulation of reinforcement ...
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- Aristotle on generosity
- Understanding masticatory function in unilateral c...
- ABO certification a valuable learning experience—n...
- A challenge that is surmountable: Rethinking Ameri...
- Table of Contents
- Rethinking American Board of Orthodontics certific...
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- Serum and urine insulin-like growth factor-1 as bi...
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- Authors’ response
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- Authors’ response
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- Addition of ammonium-based methacrylates to an exp...
- Evaluation of objective structured clinical examin...
- Vaccine allergy
- Risk of obstructive sleep apnea in African America...
- Systemic reaction to timothy grass pollen sublingu...
- Hypothyroidism in Carcinoma of the Tongue with Adj...
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