Volume currents in biomagnetic imaging

1990 ◽  
Author(s):  
William J. Dallas
Keyword(s):  
Volume Currents ◽  
Biomagnetic Imaging

PEG modified BaGdF5:Yb/Er nanoprobes for multi-modal upconversion fluorescent, in vivo X-ray computed tomography and biomagnetic imaging

Biomaterials ◽  
2012 ◽  
Vol 33 (36) ◽  
pp. 9232-9238 ◽  
Author(s):  
Songjun Zeng ◽  
Ming-Kiu Tsang ◽  
Chi-Fai Chan ◽  
Ka-Leung Wong ◽  
Jianhua Hao
Keyword(s):  
Computed Tomography ◽  
X Ray ◽  
X Ray Computed ◽  
Biomagnetic Imaging

A Linear Estimation Approach to Biomagnetic Imaging

1989 ◽  
pp. 571-574 ◽  
Author(s):  
W. H. Kullmann ◽  
K. D. Jandt ◽  
K. Rehm ◽  
H. A. Schlitt ◽  
W. J. Dallas ◽  
...  
Keyword(s):  
Linear Estimation ◽  
Biomagnetic Imaging

Improved SQUID Sensors for Biomagnetic Imaging

2011 ◽  
pp. 291-295
Author(s):  
Antonio Vettoliere ◽  
C. Granata ◽  
S. Rombetto ◽  
M. Russo
Keyword(s):  
Biomagnetic Imaging

Performances of compact integrated superconducting magnetometers for biomagnetic imaging

2008 ◽  
Vol 104 (7) ◽  
pp. 073905 ◽  
Author(s):  
C. Granata ◽  
A. Vettoliere ◽  
S. Rombetto ◽  
C. Nappi ◽  
M. Russo
Keyword(s):  
Biomagnetic Imaging

scholarly journals Measuring MEG closer to the brain: Performance of on-scalp sensor arrays

2016 ◽  
Author(s):  
Joonas Iivanainen ◽  
Matti Stenroos ◽  
Lauri Parkkonen
Keyword(s):  
Sensor Arrays ◽  
Element Model ◽  
Magnetic Resonance Images ◽  
Field Pattern ◽  
Optically Pumped ◽  
Point Spread Functions ◽  
Field Patterns ◽  
Compartment Boundary ◽  
Volume Currents ◽  
Squid Magnetometers

AbstractOptically-pumped magnetometers (OPMs) have recently reached sensitivity levels required for magnetoencephalogra-phy (MEG). OPMs do not need cryogenics and can thus be placed within millimetres from the scalp into an array that adapts to the invidual head size and shape, thereby reducing the distance from cortical sources to the sensors. Here, we quantified the improvement in recording MEG with hypothetical on-scalp OPM arrays compared to a 306-channel state-of-the-art SQUID array (102 magnetometers and 204 planar gradiometers).We simulated OPM arrays that measured either normal (nOPM; 102 sensors), tangential (tOPM; 204 sensors), or all components (aOPM; 306 sensors) of the magnetic field. We built forward models based on magnetic resonance images of 10 adult heads; we employed a three-compartment boundary element model and distributed current dipoles evenly across the cortical mantle.Compared to the SQUID magnetometers, nOPM and tOPM yielded 7.5 and 5.3 times higher signal power, while the correlations between the field patterns of source dipoles were reduced by factors of 2.8 and 3.6, respectively. Values of the field-pattern correlations were similar across nOPM, tOPM and SQUID gradiometers. Volume currents reduced the signals of primary currents on average by 10%, 72% and 15% in nOPM, tOPM and SQUID magnetometers, respectively. The information capacities of the OPM arrays were clearly higher than that of the SQUID array. The dipole-localization accuracies of the arrays were similar while the minimum-norm-based point-spread functions were on average 2.4 and 2.5 times more spread for the SQUID array compared to nOPM and tOPM arrays, respectively.

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