All-planar SQUIDs and pickup coils for combined MEG and MRI

Juho Luomahaara (Corresponding Author), P.T. Vesanen, J. Penttilä, J.O. Nieminen, J. Dabek, J. Simola, Mikko Kiviranta, Leif Grönberg, C.J. Zevenhoven, R.J. Ilmoniemi, Juha Hassel

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)

Abstract

Flux trapping and random flux movement are common problems in superconducting thin-film devices. Ultrasensitive magnetic field sensors based on superconducting quantum interference devices (SQUIDs) coupled to large pickup coils are especially vulnerable to strong external fields. The issue has become particularly relevant with the introduction of SQUID-based ultra-low-field (ULF) nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) techniques. In this paper, we study the constraints of thin-film-based magnetometers and gradiometers as exposed to magnetic field sequences of ULF MRI. In particular, we address issues such as response recovery, transient noise, magnetization and behaviour under shielded room conditions after prepolarization. As a result, we demonstrate sensors that are suitable for a combined multi-channel magnetoencephalography (MEG) and MRI imaging system.
Original languageEnglish
Article number075020
Number of pages7
JournalSuperconductor Science and Technology
Volume24
Issue number7
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

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Magnetoencephalography
Pickups
SQUIDs
Magnetic resonance
magnetic resonance
coils
interference
Imaging techniques
sensors
Magnetic fields
Thin film devices
Flux pinning
gradiometers
Superconducting films
Sensors
Magnetometers
thin films
magnetic fields
imaging techniques
Imaging systems

Cite this

Luomahaara, J., Vesanen, P. T., Penttilä, J., Nieminen, J. O., Dabek, J., Simola, J., ... Hassel, J. (2011). All-planar SQUIDs and pickup coils for combined MEG and MRI. Superconductor Science and Technology, 24(7), [075020]. https://doi.org/10.1088/0953-2048/24/7/075020
Luomahaara, Juho ; Vesanen, P.T. ; Penttilä, J. ; Nieminen, J.O. ; Dabek, J. ; Simola, J. ; Kiviranta, Mikko ; Grönberg, Leif ; Zevenhoven, C.J. ; Ilmoniemi, R.J. ; Hassel, Juha. / All-planar SQUIDs and pickup coils for combined MEG and MRI. In: Superconductor Science and Technology. 2011 ; Vol. 24, No. 7.
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Luomahaara, J, Vesanen, PT, Penttilä, J, Nieminen, JO, Dabek, J, Simola, J, Kiviranta, M, Grönberg, L, Zevenhoven, CJ, Ilmoniemi, RJ & Hassel, J 2011, 'All-planar SQUIDs and pickup coils for combined MEG and MRI', Superconductor Science and Technology, vol. 24, no. 7, 075020. https://doi.org/10.1088/0953-2048/24/7/075020

All-planar SQUIDs and pickup coils for combined MEG and MRI. / Luomahaara, Juho (Corresponding Author); Vesanen, P.T.; Penttilä, J.; Nieminen, J.O.; Dabek, J.; Simola, J.; Kiviranta, Mikko; Grönberg, Leif; Zevenhoven, C.J.; Ilmoniemi, R.J.; Hassel, Juha.

In: Superconductor Science and Technology, Vol. 24, No. 7, 075020, 2011.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Luomahaara, Juho

AU - Vesanen, P.T.

AU - Penttilä, J.

AU - Nieminen, J.O.

AU - Dabek, J.

AU - Simola, J.

AU - Kiviranta, Mikko

AU - Grönberg, Leif

AU - Zevenhoven, C.J.

AU - Ilmoniemi, R.J.

AU - Hassel, Juha

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AB - Flux trapping and random flux movement are common problems in superconducting thin-film devices. Ultrasensitive magnetic field sensors based on superconducting quantum interference devices (SQUIDs) coupled to large pickup coils are especially vulnerable to strong external fields. The issue has become particularly relevant with the introduction of SQUID-based ultra-low-field (ULF) nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) techniques. In this paper, we study the constraints of thin-film-based magnetometers and gradiometers as exposed to magnetic field sequences of ULF MRI. In particular, we address issues such as response recovery, transient noise, magnetization and behaviour under shielded room conditions after prepolarization. As a result, we demonstrate sensors that are suitable for a combined multi-channel magnetoencephalography (MEG) and MRI imaging system.

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