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

Eddy Currents01:25

Eddy Currents

Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
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...

You might also read

Related Articles

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

Sort by
Same author

A New Prognostic Risk Signature of Eight Ferroptosis-Related Genes in the Clear Cell Renal Cell Carcinoma.

Frontiers in oncology·2021
Same author

A Pediatric Knee Exoskeleton With Real-Time Adaptive Control for Overground Walking in Ambulatory Individuals With Cerebral Palsy.

Frontiers in robotics and AI·2021
Same author

Neurobiological substrates of the positive formal thought disorder in schizophrenia revealed by seed connectome-based predictive modeling.

NeuroImage. Clinical·2021
Same author

The effect of pantoprazole and somatostatin combined with thrombin in the treatment of non-esophagogastric varicosity upper gastrointestinal bleeding.

American journal of translational research·2021
Same author

PDL1-positive exosomes suppress antitumor immunity by inducing tumor-specific CD8<sup>+</sup> T cell exhaustion during metastasis.

Cancer science·2021
Same author

Reshaping cell line development and CMC strategy for fast responses to pandemic outbreak.

Biotechnology progress·2021

Related Experiment Video

Updated: May 10, 2026

Tracking the Mammary Architectural Features and Detecting Breast Cancer with Magnetic Resonance Diffusion Tensor Imaging
15:48

Tracking the Mammary Architectural Features and Detecting Breast Cancer with Magnetic Resonance Diffusion Tensor Imaging

Published on: December 15, 2014

Magnetic tracking for TomoTherapy systems: gradiometer based methods to filter eddy-current magnetic fields.

John E McGary1, Zubiao Xiong, Ji Chen

  • 1Department of Radiology, Baylor College of Medicine, Houston, Texas 77030, USA. mcgaryj@sbcglobal.net

Medical Physics
|July 5, 2013
PubMed
Summary

This study explores magnetic field gradients for accurate tumor tracking in TomoTherapy. Gradiometer arrays significantly improve localization accuracy by mitigating eddy-current interference, making them promising for real-time cancer treatment guidance.

More Related Videos

Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking
07:21

Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking

Published on: February 12, 2011

Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging
11:27

Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging

Published on: April 4, 2013

Related Experiment Videos

Last Updated: May 10, 2026

Tracking the Mammary Architectural Features and Detecting Breast Cancer with Magnetic Resonance Diffusion Tensor Imaging
15:48

Tracking the Mammary Architectural Features and Detecting Breast Cancer with Magnetic Resonance Diffusion Tensor Imaging

Published on: December 15, 2014

Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking
07:21

Magnetic Resonance Derived Myocardial Strain Assessment Using Feature Tracking

Published on: February 12, 2011

Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging
11:27

Magnetically-Assisted Remote Controlled Microcatheter Tip Deflection under Magnetic Resonance Imaging

Published on: April 4, 2013

Area of Science:

  • Medical Physics
  • Biomedical Engineering
  • Radiation Oncology

Background:

  • TomoTherapy systems require real-time tumor tracking for precise radiation delivery.
  • Eddy-current magnetic fields in TomoTherapy systems can degrade the accuracy of electromagnetic tracking systems.
  • Accurate tracking is essential to minimize off-target radiation exposure.

Purpose of the Study:

  • To investigate the feasibility of using magnetic field gradients for improved localization accuracy in TomoTherapy.
  • To design a tracking system that accounts for eddy fields generated within the TomoTherapy bore.
  • To determine the potential of magnetic tracking for real-time tumor localization during radiotherapy.

Main Methods:

  • Electromagnetic models simulated magnetic fields and eddy currents within a conducting cylinder.
  • A least-squares fit using the dipole equation calculated source position from simulated sensor data.
  • An iterative method estimated magnetic fields at sensor centers, accounting for spatial gradients using paired uniaxial sensors in a gradiometer array.

Main Results:

  • Experimental magnetic fields were 1%-10% lower than model calculations.
  • A 5x5 gradiometer array achieved 2-4 times greater localization accuracy than a planar sensor array.
  • Gradiometer arrays demonstrated localization accuracy within 1.3 mm over 20 cm, compared to 5 mm for single arrays.

Conclusions:

  • The gradiometer method shows significant potential for accurate magnetic tracking in TomoTherapy.
  • Further research with realistic sensor models and extensive numerical studies is recommended.
  • Prototype development requires a thorough estimation of magnetic tracking accuracy within the TomoTherapy system.