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  Practical MRI: a toolkit of standard MR pulse sequences

Hagberg, G. (2019). Practical MRI: a toolkit of standard MR pulse sequences. Talk presented at 25th European Congress of Radiology (ECR 2019): The Bigger Picture. Wien, Austria. 2019-02-27 - 2019-03-03.

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Hagberg, G1, 2, Author              
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1Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497796              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: The MR-sequence is an essential tool to measure MR-properties in tissues, increased contrast between these and quantify relevant data. Besides furnishing the desired tissue-derived MR signal, the sequence must allow spatial encoding to take place as efficient as possible to enable patient compliance, and high-quality MRI at the same time. Starting with a brief introduction regarding MR-tissue properties and spatial encoding in k-space, I will describe the fundamental MR toolkit, based on single echo spin-echo (SE) and gradient-echo (GE) and show how these are extended to different multipleecho regimes. Basic image contrast and how imaging parameters: repetition time, TR; echo time, TE; flip angle, FA; inversion delay, diffusion gradients, etc.; influence contrast will be described. The possibility to further enhance imaging by adequate spin-preparation: inversion or magnetisation transfer pulses etc.; will also be discussed. Imaging speed can be achieved while remaining in the single echo regime by faster RF pulsing (shorter TR) giving valuable information linked with magnetic susceptibility like in the GE-based FLASH method, based on spoiling of unwanted echoes. Another possibility is to use multiple (spin) echoes to read out different k-space lines, and hereby speed up spatial sampling, like in the SE-based method RARE. An alternative possibility that further extends available image contrast is to retain the full magnetisation in GE-based sequences and acquire images in the different steady-state-free-precession regimes. The latter techniques have gained momentum through the advent of magnetic fingerprinting and are evolving into another fundamental part of the standard MRI-toolkit.

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 Dates: 2019-02
 Publication Status: Published in print
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 Identifiers: DOI: 10.1186/s13244-019-0713-y
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Title: 25th European Congress of Radiology (ECR 2019): The Bigger Picture
Place of Event: Wien, Austria
Start-/End Date: 2019-02-27 - 2019-03-03

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Title: Insights into Imaging
Source Genre: Journal
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Pages: - Volume / Issue: 10 (Supplement 1) Sequence Number: A-0912 Start / End Page: S150 - S151 Identifier: ISSN: 1869-4101