Unshielded SQUID Sensors for Ultra-Low-Field Magnetic Resonance Imaging

Juho Luomahaara, Mikko Kiviranta, Leif Grönberg, Koos Zevenhoven, Petteri Laine

Research output: Contribution to journalArticleScientificpeer-review

Abstract

We have implemented a new field-tolerant low-critical-temperature superconducting quantum interference device current sensor with submicrometer Josephson junctions. The small junction area enables the fabrication of devices with lower sensor noise and higher tolerance against magnetic fields. An application benefitting from these properties is ultra-low-field magnetic resonance imaging (ULF MRI). In the currently ongoing BREAKBEN project, new technology is being pushed forward by combining ULF MRI with magnetoencephalography in a single instrument. We describe the sensor architecture aimed for this purpose and justify the guidelines behind the design. Experimental characterization reveals that, with the aid of reasonable amount of heating, unshielded sensor operation after high magnetic pulses at least up to 150 mT appears to be possible.
Original languageEnglish
Article number1600204
JournalIEEE Transactions on Applied Superconductivity
Volume28
Issue number4
DOIs
Publication statusPublished - 8 Jan 2018
MoE publication typeA1 Journal article-refereed

Fingerprint

SQUIDs
magnetic resonance
sensors
Sensors
Magnetic resonance
noise tolerance
Magnetoencephalography
Imaging techniques
Josephson junctions
critical temperature
Magnetic fields
interference
Heating
Fabrication
fabrication
heating
Magnetic Resonance Imaging
pulses
magnetic fields
Temperature

Keywords

  • SQUIDs
  • Magnetic sensors
  • Heating systems
  • Junctions
  • Coils

Cite this

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title = "Unshielded SQUID Sensors for Ultra-Low-Field Magnetic Resonance Imaging",
abstract = "We have implemented a new field-tolerant low-critical-temperature superconducting quantum interference device current sensor with submicrometer Josephson junctions. The small junction area enables the fabrication of devices with lower sensor noise and higher tolerance against magnetic fields. An application benefitting from these properties is ultra-low-field magnetic resonance imaging (ULF MRI). In the currently ongoing BREAKBEN project, new technology is being pushed forward by combining ULF MRI with magnetoencephalography in a single instrument. We describe the sensor architecture aimed for this purpose and justify the guidelines behind the design. Experimental characterization reveals that, with the aid of reasonable amount of heating, unshielded sensor operation after high magnetic pulses at least up to 150 mT appears to be possible.",
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Unshielded SQUID Sensors for Ultra-Low-Field Magnetic Resonance Imaging. / Luomahaara, Juho; Kiviranta, Mikko; Grönberg, Leif; Zevenhoven, Koos; Laine, Petteri.

In: IEEE Transactions on Applied Superconductivity, Vol. 28, No. 4, 1600204, 08.01.2018.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Kiviranta, Mikko

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