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Related Concept Videos

Magnetic Vector Potential01:15

Magnetic Vector Potential

In electrostatics, the electric field can be written as the negative gradient of the potential. In magnetostatics, the zero divergence of the magnetic field ensures that the magnetic field can be expressed as the curl of a vector potential. This potential is known as the magnetic vector potential.
Consider an ideal solenoid with n turns per unit length and radius R. If I is the current through the solenoid, the magnetic field inside the solenoid is expressed as the product of vacuum...
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.
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...
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...
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.
Magnetic Resonance Imaging01:24

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

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Low-Cost Electroencephalographic Recording System Combined with a Millimeter-Sized Coil to Transcranially Stimulate the Mouse Brain In Vivo
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Gradient waveform synthesis for magnetic propulsion using MRI gradient coils.

B H Han1, S Park, S Y Lee

  • 1Department of Biomedical Engineering, Kyung Hee University, Korea.

Physics in Medicine and Biology
|August 13, 2008
PubMed
Summary
This summary is machine-generated.

This study details precise magnetic navigation of untethered micro-devices using MRI gradient coils. Waveforms were synthesized for accurate device control in medical applications.

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging Physics

Background:

  • Untethered micro-device navigation is crucial for medical diagnostics and therapeutics.
  • Magnetic propulsion offers a promising method for controlling these devices.
  • MRI gradient coils can provide directional magnetic propulsion and imaging capabilities.

Purpose of the Study:

  • To develop precise navigation strategies for untethered micro-devices within living subjects.
  • To investigate the use of MRI gradient coils for micro-device propulsion.
  • To account for concomitant gradient fields for accurate peripheral navigation.

Main Methods:

  • Calculated magnetic force fields using Maxwell and Golay coil configurations.
  • Considered both linear and concomitant gradient fields in MRI systems.
  • Synthesized gradient waveforms for controlled device path following.

Main Results:

  • Magnetic force fields generated by gradient coils differ from conventional linear fields.
  • Developed a method to accurately predict and control micro-device movement.
  • Demonstrated the feasibility of MRI-guided micro-device navigation.

Conclusions:

  • Precise navigation of untethered micro-devices is achievable using MRI gradient coils.
  • Accounting for complex gradient fields is essential for accurate control.
  • This technique has significant potential for future medical interventions.