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Related Concept Videos

Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
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Magnetic Force Between Two Parallel Currents01:13

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Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...
Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
Atomic Nuclei: Larmor Precession Frequency01:11

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Simultaneous Transcranial Alternating Current Stimulation and Functional Magnetic Resonance Imaging
10:25

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Published on: June 5, 2017

Imaging periodic currents using alternating balanced steady-state free precession.

Giedrius T Buracas1, Thomas T Liu, Richard B Buxton

  • 1Department of Radiology, UCSD Center for Functional MRI, La Jolla, California 92037, USA. gburacas@ucsd.edu

Magnetic Resonance in Medicine
|December 1, 2007
PubMed
Summary
This summary is machine-generated.

Researchers developed a new MRI method to directly detect neuronal electrical activity. This technique, using alternating balanced steady-state free precession (ABSS) imaging, shows promise for more sensitive brain imaging compared to existing methods.

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Area of Science:

  • Neuroimaging
  • Biophysics
  • Magnetic Resonance Imaging

Background:

  • Current functional MRI indirectly measures neuronal activity via blood oxygenation.
  • Direct detection of neuronal electrical currents using MRI (ncMRI) has been challenging with conventional sequences.

Purpose of the Study:

  • To investigate the potential of balanced steady-state free precession (bSSFP) pulse sequences for direct neuronal current detection.
  • To develop a novel MRI approach for enhanced sensitivity to neuronal electrical activity.

Main Methods:

  • Utilized a balanced steady-state free precession (bSSFP) pulse sequence modified to amplify phase perturbations from electrical currents.
  • Developed an alternating balanced steady-state (ABSS) imaging technique by synchronizing periodic currents with RF pulse trains.
  • Conducted phantom experiments to assess sensitivity to magnetic field variations.

Main Results:

  • The ABSS imaging technique demonstrated high sensitivity to phase perturbations caused by periodic currents.
  • Detected magnetic field variations as small as 0.15 nT within a 36-second scan.
  • Achieved higher sensitivity compared to traditional gradient-recalled echo imaging methods.

Conclusions:

  • The ABSS imaging method offers a novel and highly sensitive approach for directly detecting neuronal electrical currents.
  • This technique holds significant potential for advancing functional neuroimaging by providing a more direct measure of neuronal activity.
  • The findings suggest a new avenue for developing more precise brain imaging tools.