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Related Concept Videos

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 Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
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...
Induced Electric Fields01:23

Induced Electric Fields

The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...

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Related Experiment Video

Updated: Jun 22, 2026

Cardiac Magnetic Resonance Imaging at 7 Tesla
09:14

Cardiac Magnetic Resonance Imaging at 7 Tesla

Published on: January 6, 2019

Three-tesla high-field applications.

Peter D Kim1, Charles L Truwit, Walter A Hall

  • 1Department of Neurosurgery, State University of New York, Upstate Medical University, 750 East Adams Street, Syracuse, NY 13210, USA.

Neurosurgery Clinics of North America
|June 27, 2009
PubMed
Summary
This summary is machine-generated.

High-field 3-Tesla intraoperative MRI (iMRI) offers superior soft tissue visualization and functional imaging for neurosurgery. Despite challenges, 3-T iMRI is poised to become the standard of care for advanced image-guided neurosurgical procedures.

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The Clinical Application of Tumor Treating Fields Therapy in Glioblastoma
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The Clinical Application of Tumor Treating Fields Therapy in Glioblastoma

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Cardiac Magnetic Resonance Imaging at 7 Tesla
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Cardiac Magnetic Resonance Imaging at 7 Tesla

Published on: January 6, 2019

The Clinical Application of Tumor Treating Fields Therapy in Glioblastoma
08:00

The Clinical Application of Tumor Treating Fields Therapy in Glioblastoma

Published on: April 16, 2019

Area of Science:

  • Neurosurgery
  • Medical Imaging
  • Radiology

Background:

  • Intraoperative MRI (iMRI) is crucial for guiding neurosurgical procedures.
  • Current midfield iMRI systems have limitations in image quality and functional capabilities.

Purpose of the Study:

  • To evaluate the potential of 3-Tesla (3-T) high-field iMRI as the future standard of care in neurosurgery.
  • To highlight the advantages of 3-T iMRI over lower-field systems.

Main Methods:

  • The study is a review and expert opinion piece based on the authors' experience and understanding of current iMRI technology.
  • Discussion of image acquisition challenges and benefits of 3-T high-field MRI.

Main Results:

  • 3-T iMRI provides superior soft tissue visualization and clearer delineation of residual tumor tissue.
  • Offers advanced functional imaging capabilities, including brain activation studies and complex vascular imaging, not available with lower-field iMRI.
  • Overcomes image acquisition challenges associated with higher field strengths.

Conclusions:

  • 3-T high-field iMRI offers significant advantages for neurosurgical procedures.
  • The adoption of 3-T iMRI represents a natural progression in image-guided neurosurgery, despite the associated costs and efforts.
  • 3-T iMRI is likely to become the standard of care for various neurosurgical interventions.