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@ARTICLE{Berneking:830108,
author = {Berneking, Arne and Trinchero, Riccardo and Ha, YongHyun
and Finster, Felix and Cerello, Piergiorgio and Lerche,
Christoph and Shah, N. J.},
title = {{D}esign and {C}haracterization of a
{G}radient-{T}ransparent {RF} {C}opper {S}hield for {PET}
{D}etector {M}odules in {H}ybrid {MR}-{PET} {I}maging},
journal = {IEEE transactions on nuclear science},
volume = {64},
number = {5},
issn = {1558-1578},
address = {New York, NY},
publisher = {IEEE},
reportid = {FZJ-2017-03691},
pages = {1118-1127},
year = {2017},
abstract = {This paper focuses on the design and the characterization
of a frequency-selective shield for positron emission
tomography (PET) detector modules of hybrid magnetic
resonance-PET scanners, where the shielding of the PET
cassettes is located close to the observed object. The
proposed shielding configuration is designed and optimized
to guarantee a high shielding effectiveness (SE) of up to 60
dB for B1 -fields at the Larmor frequency of 64 MHz, thus
preventing interactions between the radio-frequency (RF)
coil and PET electronics. On the other hand, the shield is
transparent to the gradient fields with the consequence that
eddy-current artifacts in the acquired EPI images are
significantly reduced with respect to the standard
solid-shield configuration. The frequency-selective behavior
of the shield is characterized and validated via simulation
studies with CST MICROWAVE STUDIO in the megahertz and
kilohertz range. Bench measurements with an RF coil built
in-house demonstrated the high SE at the Larmor frequency.
Moreover, measurements on a 4-T human scanner confirmed the
abolishment of eddy current artifact and also provided an
understanding of where the eddy currents occur with respect
to the sequence parameters. Simulations and measurements for
the proposed shielding concept were compared with a solid
copper shielding configuration.},
cin = {INM-4 / JARA-BRAIN},
ddc = {620},
cid = {I:(DE-Juel1)INM-4-20090406 / $I:(DE-82)080010_20140620$},
pnm = {573 - Neuroimaging (POF3-573)},
pid = {G:(DE-HGF)POF3-573},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000401949800002},
doi = {10.1109/TNS.2017.2691546},
url = {https://juser.fz-juelich.de/record/830108},
}