Gallichan, Daniel ![]() |
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Abstract
The continued drive towards MRI scanners operating at increasingly higher main magnetic fields is primarily motivated by the maxim that more teslas mean more signal and lead to better images. This promise of increased signal, which cannot easily be achieved in other ways, encourages efforts to overcome the inextricable technical challenges which accompany this endeavor. Unlike for many applications, however, diffusion imaging is not currently able to directly reap these potential signal gains – at the time of writing it seems fair to say that, for matched gradient and RF hardware, the majority of diffusion images acquired at 7T, while comparable in quality to those achievable at 3T, do not demonstrate a clear advantage over what can be obtained at lower field. This does not mean that diffusion imaging at UHF is not a worthwhile pursuit – but more a reflection of the fact that the associated challenges are manifold – and converting the potential of higher field strengths into ‘better’ diffusion imaging is by no means a straightforward task. This article attempts to summarize the specific reasons that make diffusion imaging at UHF more complicated than one might expect, and to highlight the range of developments that have already been made which have enabled diffusion images of excellent quality to be acquired at 7T.
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Cardiff University Brain Research Imaging Centre (CUBRIC) Engineering |
Uncontrolled Keywords: | Diffusion MRI, ultra-high field, SNR efficiency, simultaneous multi-slice |
Publisher: | Elsevier |
ISSN: | 1053-8119 |
Date of First Compliant Deposit: | 24 May 2017 |
Date of Acceptance: | 15 April 2017 |
Last Modified: | 06 Nov 2023 18:15 |
URI: | https://orca.cardiff.ac.uk/id/eprint/100839 |
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