Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements08:50

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

2.7K
Here, we describe a high-speed magnetic tweezer setup that performs nanomechanical measurements on force-sensitive biomolecules at the maximum rate of 1.2 kHz. We introduce its application to DNA hairpins and SNARE complexes as model systems, but it will be also applicable to other molecules involved in mechanobiological events.
2.7K
Force and Position Control in Humans - The Role of Augmented Feedback06:31

Force and Position Control in Humans - The Role of Augmented Feedback

8.2K
Controlling an identical movement with position or force feedback results in different neural activation and motor behavior. This protocol describes how to investigate behavioral changes by looking at neuromuscular fatigue and how to evaluate motor cortical (inhibitory) activity using subthreshold TMS with respect to the interpretation of augmented feedback.
8.2K
Surface Potential Measurement of Bacteria Using Kelvin Probe Force Microscopy10:49

Surface Potential Measurement of Bacteria Using Kelvin Probe Force Microscopy

22.4K
Here, we present a protocol explaining the use of Kelvin probe force microscopy as a tool for generating high resolution nano-scale surface potential maps. This tool was applied to assess the role of surface potential on the binding capacity of microorganisms to substrate surfaces.
22.4K
Magnetic Force01:18

Magnetic Force

1.8K
In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
1.8K
Role of Diffusion MRI Tractography in Endoscopic Endonasal Skull Base Surgery09:53

Role of Diffusion MRI Tractography in Endoscopic Endonasal Skull Base Surgery

4.1K
We present a protocol to integrate diffusion MRI tractography in patient work-up to endoscopic endonasal surgery for a skull base tumor. The methods for adopting these neuroimaging studies in the pre- and intra-operative phases are...
4.1K
Relation Between Moment of a Force and Angular Momentum01:21

Relation Between Moment of a Force and Angular Momentum

1.2K
In the realm of spinning tops, the application of force at a distance from the center produces torque, a pivotal factor that alters the angular momentum of the top, thereby inducing its rotation. The concept of moment, akin to linear force in rotation, quantifies how a force acting upon an object initiates rotational motion. Angular momentum serves as the rotational counterpart to linear momentum, representing an object's inherent tendency to persist in its rotational state.
The temporal...
1.2K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

HHead motion correction based on pilot tone signals in MRI - a referenceless method.

IEEE transactions on medical imaging·2026
Same author

Deep cervical lymph node analysis in central nervous system inflammatory disease.

Frontiers in immunology·2026
Same author

Focus correction in MR thermography for increased targeting precision during focused ultrasound procedures.

Magnetic resonance in medicine·2025
Same author

Physics Informed Neural Networks for Estimation of Tissue Properties from Multi-echo Configuration State MRI.

Medical image computing and computer-assisted intervention : MICCAI ... International Conference on Medical Image Computing and Computer-Assisted Intervention·2024
Same author

Characterizing dispersion in bovine liver using ARFI-based shear wave rheometry.

Biomedical physics & engineering express·2024
Same author

Preliminary Experience with Three Alternative Motion Sensors for 0.55 Tesla MR Imaging.

Sensors (Basel, Switzerland)·2024

Related Experiment Video

Updated: Jan 19, 2026

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
08:50

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

2.7K

Relative Magnetic Force Measures and Their Potential Role in MRI Safety Practice.

Lawrence P Panych1,2, Vera K Kimbrell2, Srinivasan Mukundan2,3

  • 1Department of Medical Imaging, Schulich School of Medicine and Dentistry, University of Western Ontario, London, Ontario, Canada.

Journal of Magnetic Resonance Imaging : JMRI
|September 12, 2019
PubMed
Summary
This summary is machine-generated.

Magnetic force measurements provide crucial MRI safety data. This study developed a method to accurately quantify the relative magnetic force of ferromagnetic objects, enhancing safety protocols in MRI environments.

Keywords:
MRI physicsforce mappingmagnetic fieldssafety

More Related Videos

Force and Position Control in Humans - The Role of Augmented Feedback
06:31

Force and Position Control in Humans - The Role of Augmented Feedback

Published on: June 19, 2016

8.2K
Surface Potential Measurement of Bacteria Using Kelvin Probe Force Microscopy
10:49

Surface Potential Measurement of Bacteria Using Kelvin Probe Force Microscopy

Published on: November 28, 2014

22.4K

Related Experiment Videos

Last Updated: Jan 19, 2026

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
08:50

High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements

Published on: May 12, 2023

2.7K
Force and Position Control in Humans - The Role of Augmented Feedback
06:31

Force and Position Control in Humans - The Role of Augmented Feedback

Published on: June 19, 2016

8.2K
Surface Potential Measurement of Bacteria Using Kelvin Probe Force Microscopy
10:49

Surface Potential Measurement of Bacteria Using Kelvin Probe Force Microscopy

Published on: November 28, 2014

22.4K

Area of Science:

  • Medical Imaging Physics
  • Biomedical Engineering
  • Radiological Safety

Background:

  • Magnetic Resonance Imaging (MRI) sites use visual markings to indicate magnetic field strength for safety.
  • Relative magnetic force (magnetic to gravitational forces ratio) offers a complementary metric for assessing ferromagnetic object risks in MRI rooms.

Purpose of the Study:

  • To develop and validate methods for deriving relative magnetic force measures for MRI safety.
  • To establish a simple force index for quantifying risks associated with ferromagnetic materials in MRI environments.

Main Methods:

  • A specialized rig was constructed to experimentally measure relative magnetic forces on small ferromagnetic objects.
  • Quantitative comparisons were performed between theoretical and measured forces on six ferromagnetic items (iron, paper clip, Kelly clamp, nail clippers, cell phone, small magnet).
  • The Bland-Altman method was utilized for data analysis across MRI systems ranging from 1.5T to 7T.

Main Results:

  • After rig positioning error correction at 1.5T, limits of agreement between measured and estimated relative forces were ±0.16 across four MRI systems.
  • A relative force of 1.0 signifies magnetic force equaling gravitational force.
  • No significant bias was detected in the experimental data (P ≤ 0.05).

Conclusions:

  • Accurate derivation of relative magnetic forces on ferromagnetic objects is feasible for MRI safety applications.
  • The developed methods provide a reliable means to quantify risks, improving safety in MRI settings.