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@ARTICLE{Mueller:154194,
author = {Mueller, Sebastian and Stirnberg, Rüdiger and Akbey, Suzan
and Ehses, Philipp and Scheffler, Klaus and Stöcker, Tony
and Zaiss, Moritz},
title = {{W}hole brain snapshot {CEST} at 3{T} using 3{D}-{EPI}:
{A}iming for speed, volume, and homogeneity.},
journal = {Magnetic resonance in medicine},
volume = {84},
number = {5},
issn = {1522-2594},
address = {New York, NY [u.a.]},
publisher = {Wiley-Liss},
reportid = {DZNE-2021-00056},
pages = {2469 - 2483},
year = {2020},
abstract = {CEST MRI enables imaging of distributions of
low-concentrated metabolites as well as proteins and
peptides and their alterations in diseases. CEST
examinations often suffer from low spatial resolution, long
acquisition times, and concomitant motion artifacts. This
work aims to maximize both resolution and volume coverage
with a 3D-EPI snapshot CEST approach at 3T, allowing for
fast and robust whole-brain CEST MRI.Resolution and temporal
SNR of 3D-EPI examinations with nonselective excitation were
optimized at a clinical 3T MR scanner in five healthy
subjects using a clinical head/neck coil. A CEST
presaturation module for low power relayed nuclear
Overhauser enhancement and amide proton transfer contrast
was applied as an example. The suggested postprocessing
included motion correction, dynamic B0 correction,
denoising, and B1 correction and was compared to an
established 3D-gradient echo-based sequence.CEST
examinations were performed at 1.8 mm nominal isotropic
resolution in 4.3 s per presaturation offset. In contrast
to slab-selective 3D or multislice approaches, the whole
brain was covered. Repeated examinations at three different
B1 values took 13 minutes for 58 presaturation offsets with
temporal SNR around 75. The resulting CEST effects revealed
significant gray and white matter contrast and were of
similar quality across the whole brain. Coefficient of
variation across three healthy subjects was below $9\%.The$
suggested protocol enables whole brain coverage at 1.8 mm
isotropic resolution and fast acquisition of 4.3 s per
presaturation offset. For the fitted CEST amplitudes, high
reproducibility was proven, increasing the opportunities of
quantitative CEST investigations at 3T significantly.},
keywords = {Brain: diagnostic imaging / Humans / Magnetic Resonance
Imaging / Protons / Reproducibility of Results / White
Matter / 3D CEST MRI (Other) / chemical exchange saturation
transfer MRI 3T (Other) / chemical exchange saturation
transfer MRI EPI (Other) / high resolution CEST MRI (Other)
/ whole-brain CEST MRI (Other)},
cin = {AG Stöcker},
ddc = {610},
cid = {I:(DE-2719)1013026},
pnm = {345 - Population Studies and Genetics (POF3-345)},
pid = {G:(DE-HGF)POF3-345},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:32385888},
doi = {10.1002/mrm.28298},
url = {https://pub.dzne.de/record/154194},
}