Abstract
Background Recently introduced MRI techniques offer improved image quality and facilitate examinations
of patients even when artefacts are expected. They pave the way for novel diagnostic
imaging strategies in neuroradiology. These methods include improved 3D imaging, movement
and metal artefact reduction techniques as well as Dixon techniques.
Methods Narrative review with an educational focus based on current literature research and
practical experiences of different professions involved (physicians, MRI technologists/radiographers,
physics/biomedical engineering). Different hardware manufacturers are considered.
Results and Conclusions 3D FLAIR is an example of a versatile 3D Turbo Spin Echo sequence with broad applicability
in routine brain protocols. It facilitates detection of smaller lesions and more precise
measurements for follow-up imaging. It also offers high sensitivity for extracerebral
lesions. 3D techniques are increasingly adopted for imaging arterial vessel walls,
cerebrospinal fluid spaces and peripheral nerves. Improved hybrid-radial acquisitions
are available for movement artefact reduction in a broad application spectrum. Novel
susceptibility artefact reduction techniques for targeted application supplement previously
established metal artefact reduction sequences. Most of these techniques can be further
adapted to achieve the desired diagnostic performances. Dixon techniques allow for
homogeneous fat suppression in transition areas and calculation of different image
contrasts based on a single acquisition.
Key points:
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3D FLAIR can replace 2 D FLAIR for most brain imaging applications and can be a cornerstone
of more precise and more widely applicable protocols.
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Further 3D TSE sequences are increasingly replacing 2D TSE sequences for specific
applications.
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Improvement of artefact reduction techniques increase the potential for effective
diagnostic MRI exams despite movement or near metal implants.
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Dixon techniques facilitate homogeneous fat suppression and simultaneous acquisition
of multiple contrasts.
Citation Format
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Sundermann B, Billebaut B, Bauer J et al. Practical Aspects of novel MRI Techniques
in Neuroradiology: Part 1–3D Acquisitions, Dixon Techniques and Artefact Reduction.
Fortschr Röntgenstr 2022; 194: 1100 – 1108
Key words
MR-imaging - neuroradiology - 3D imaging - metal artefact reduction - movement artefact
reduction - Dixon
