Compact MR-compatible DC-DC converter module
dc.contributor.author
Ritzer, Christian
dc.contributor.author
Commichau, Volker
dc.contributor.author
Dhawan, Satish K.
dc.contributor.author
Fischer, Jannis
dc.contributor.author
Lustermann, Werner
dc.contributor.author
Sumner, Robert
dc.contributor.author
Warnock, Geoffrey
dc.contributor.author
Dissertori, Günther
dc.date.accessioned
2019-10-07T10:11:21Z
dc.date.available
2019-10-06T02:28:40Z
dc.date.available
2019-10-07T10:11:21Z
dc.date.issued
2019-09-20
dc.identifier.issn
1748-0221
dc.identifier.other
10.1088/1748-0221/14/09/P09016
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/368549
dc.identifier.doi
10.3929/ethz-b-000368549
dc.description.abstract
The SAFIR collaboration is developing a high rate positron emission tomography insert for a preclinical 7 T magnetic resonance imaging (MRI) device. To meet the desired performance figures, a large number of readout channels (≈15000) and integration of data digitisation into the insert are required. Consequently, the insert will consume about 1.3 kW of input power at low voltages (≤ 3.3 V). This corresponds to large supply currents of several 100 A, requiring heavy and bulky supply cables. To overcome these problems we developed a compact and MR-compatible DC-DC stepdown converter module. Our converter is based on an air core inductor and is optimised for low electromagnetic emissions. It has an input voltage range from 6 V to 24 V and provides an adjustable output voltage from 1 V almost up to the input voltage. The maximum continuous output current is 6 A. We measured conversion efficiencies between 70% and 87% depending on output load and input voltage. For the operation conditions foreseen (16 V input voltage, 2.4 V output voltage and 3 A output current), we achieved an efficiency of 83.8%. Our tests inside the MRI demonstrated the compatibility between the MRI system and the step-down converters developed. No mutual interference was observed. The signal-to-noise ratio of the MRI remains unaltered, independent of the activity of the step-down converter under any operation condition and no effect on the operation of the DC-DC converter was observed. This successful test of an MR-compatible DC-DC converter creates new opportunities for the power supply of complex hardware inside an MRI. 49 of the DC-DC converters will be used in our SAFIR PET insert, but they can also be used in other applications with high power demand in environments with strong magnetic fields.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
IOP Publishing
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.subject
Multi-modality systems
en_US
dc.subject
Voltage distributions
en_US
dc.subject
Gamma camera
en_US
dc.subject
SPECT
en_US
dc.subject
PET PET/CT
en_US
dc.subject
coronary CT angiography (CTA)
en_US
dc.subject
MRI (whole body, cardiovascular, breast, others)
en_US
dc.subject
MR-angiography (MRA)
en_US
dc.title
Compact MR-compatible DC-DC converter module
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 3.0 Unported
ethz.journal.title
Journal of Instrumentation
ethz.journal.volume
14
en_US
ethz.journal.issue
9
en_US
ethz.journal.abbreviated
JINST
ethz.pages.start
P09016
en_US
ethz.size
12 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
London
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02532 - Institut für Teilchen- und Astrophysik / Inst. Particle Physics and Astrophysics::03593 - Dissertori, Günther / Dissertori, Günther
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02010 - Dep. Physik / Dep. of Physics::02532 - Institut für Teilchen- und Astrophysik / Inst. Particle Physics and Astrophysics::03593 - Dissertori, Günther / Dissertori, Günther
ethz.date.deposited
2019-10-06T02:28:45Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2019-10-07T10:11:34Z
ethz.rosetta.lastUpdated
2024-02-02T09:30:51Z
ethz.rosetta.versionExported
true
ethz.COinS
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Journal Article [130181]