Magnetoencephalogram systems developed at KIT

Kado, H.; Higuchi, Masanori; Shimogawara, Masahiro; Haruta, Yasuhiro; Adachi, Yoshiaki; Kawai, Jun; Ogata, H.; Uehara, Gen

doi:10.1109/77.783918

Cited by 116 publications

(60 citation statements)

References 2 publications

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“…Brain activity was recorded with a whole-head MEG system (Model PQ1160R-N2, KIT, Kanazawa, Japan) consisting of 160 coaxial first-order gradiometers with a 50 mm baseline (Kado et al, 1999;Uehara et al, 2003). Prior to MEG measurements, five marker coils were placed on the participant's head and their positions and the participant's head shape were measured with a pen digitizer (Polhemus Fastrack, Colchester, VT).…”

Section: Data Acquisitionmentioning

confidence: 99%

Reduced activation of left orbitofrontal cortex precedes blocked vocalization: A magnetoencephalographic study

Sowman

Crain

Harrison

et al. 2012

Journal of Fluency Disorders

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Section: Data Acquisitionmentioning

confidence: 99%

Reduced activation of left orbitofrontal cortex precedes blocked vocalization: A magnetoencephalographic study

Sowman

Crain

Harrison

et al. 2012

Journal of Fluency Disorders

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“…Many types of multichannel biomagnetic field measurement systems using Superconductive QUantum Interference Devices (SQUIDs) have been developed. In particular, magnetoencephalography (MEG) [1,2] and magnetocardiography (MCG) [3] have already been commercialized and the installation of MEG and MCG in medical institutions is being promoted.…”

Section: Introductionmentioning

confidence: 99%

Measurement of spinal cord evoked magnetic fields by vector SQUID biomagnetometer

Adachi

Miyamoto

Kawai

et al. 2006

Electrical Engineering Japan

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SUMMARYBiomagnetometry is a powerful method for the investigation of neural activity. We developed a multichannel superconducting quantum interference device (SQUID) biomagnetometer system for measurement of the evoked magnetic field from stimulated spinal cords. The system is equipped with three dimensionally configured SQUID vector gradiometers, which can detect not only the radial components of the magnetic field applied to the subject but also the tangential components. With the system, we could successfully observe the distribution of the evoked magnetic field corresponding to neuronal signals propagating in the spinal cords of small animals in the form of momentarily changing vector maps.

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“…MEG data used to illustrate the algorithm were acquired from a 160-channel, whole-head MEG system, with 157 axial gradiometers sensitive to brain sources, and 3 magnetometers sensitive to distant environmental sources (KIT, Kanazawa, Japan, Kado et al, 1999). Subject and system were placed within a magnetically shielded room.…”

Section: Meg Datamentioning

confidence: 99%

Denoising based on spatial filtering

Cheveigné

Simon

2008

Journal of Neuroscience Methods

206

171

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We present a method for removing unwanted components of biological origin from neurophysiological recordings such as magnetoencephalography (MEG), electroencephalography (EEG), or multichannel electrophysiogical or optical recordings. A spatial filter is designed to partition recorded activity into stimulus-related and stimulus-unrelated components, based on a criterion of stimulus-evoked reproducibility. Components that are not reproducible are projected out to obtain clean data. In experiments that measure stimulus-evoked activity, typically about 80% of noise power is removed with minimal distortion of the evoked response. Signal-to-noise ratios of better than 0 dB (50% reproducible power) may be obtained for the single most reproducible spatial component. The spatial filters are synthesized using a blind source separation method known as Denoising Source Separation (DSS), that allows the measure of interest (here proportion of evoked power) to guide the source separation. That method is of greater general use, allowing data denoising beyond the classical stimulus-evoked response paradigm.

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Magnetoencephalogram systems developed at KIT

Cited by 116 publications

References 2 publications

Reduced activation of left orbitofrontal cortex precedes blocked vocalization: A magnetoencephalographic study

Reduced activation of left orbitofrontal cortex precedes blocked vocalization: A magnetoencephalographic study

Measurement of spinal cord evoked magnetic fields by vector SQUID biomagnetometer

Denoising based on spatial filtering

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