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Related Concept Videos

Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
Induction01:16

Induction

An emf is induced when the magnetic field in a coil is changed by pushing a bar magnet into or out of the coil. emfs of opposite signs are produced by motion in opposite directions, and the directions of emfs are also reversed by reversing poles. The same results are produced if the coil is moved rather than the magnet—it is the relative motion that is important. The faster the motion, the greater the emf. Additionally, there is no emf when the magnet is stationary relative to the coil.
A...
Induced Electric Fields: Applications01:27

Induced Electric Fields: Applications

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
Magnetic Field Due To A Thin Straight Wire01:27

Magnetic Field Due To A Thin Straight Wire

Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
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.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...

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Updated: May 10, 2026

Remote Magnetic Navigation for Accurate, Real-time Catheter Positioning and Ablation in Cardiac Electrophysiology Procedures
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Remote Magnetic Navigation for Accurate, Real-time Catheter Positioning and Ablation in Cardiac Electrophysiology Procedures

Published on: April 21, 2013

Prospective motion correction using inductively coupled wireless RF coils.

Melvyn B Ooi1, Murat Aksoy, Julian Maclaren

  • 1Department of Radiology, Stanford University, Stanford, California, USA.

Magnetic Resonance in Medicine
|July 2, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces a new brain MRI technique using wireless markers for motion correction. This method achieves high-quality imaging during head movements, potentially improving clinical adoption.

Keywords:
active markerinductive couplingmotion trackingprospective real‐time motion correctionradio frequency coilwireless marker

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Area of Science:

  • Medical Imaging
  • Biophysics

Background:

  • Head motion during MRI scans degrades image quality.
  • Existing prospective motion correction techniques can be cumbersome.

Purpose of the Study:

  • To present a novel prospective motion correction technique for brain MRI.
  • To utilize miniature wireless radio-frequency coils (wireless markers) for precise head position tracking.

Main Methods:

  • Wireless markers, free of cables, transmit signals via inductive coupling.
  • A pair of glasses with integrated markers tracks rigid head motion in real-time.
  • Tracking data prospectively updates image-volume orientation to compensate for head movement.

Main Results:

  • Wireless marker position measurements showed high accuracy, comparable to wired coils (SD < 0.01 mm).
  • Safety was confirmed through B1 maps and temperature measurements.
  • Successful prospective motion correction was demonstrated during deliberate head rotations in a 2D spin-echo scan.

Conclusions:

  • Wireless markers enable high-quality brain MRI acquisition even with significant head motion.
  • Advantages include small size, no RF safety risks from cables, and minimal setup.
  • The technique shows promise for wider clinical implementation.