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

Maximum Power Transfer01:16

Maximum Power Transfer

838
Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...
838
Control of Power Flow01:30

Control of Power Flow

678
There are several methods to control power flow in power systems:
678
The Maximum Power Transfer Theorem01:20

The Maximum Power Transfer Theorem

1.1K
Consider a linear AC Thevenin equivalent circuit connected to a load impedance.
The load connected draws the current, and the circuit delivers the power to the load. The alternating current flowing through the load is determined using the rectangular form of voltages, currents, network impedance, and load impedance. The average power delivered to the load is obtained from the product of the square of current and load resistance.
1.1K
Transfer Function in Control Systems01:21

Transfer Function in Control Systems

1.5K
The transfer function is a fundamental concept in the analysis and design of linear time-invariant (LTI) systems. It offers a concise way to understand how a system responds to different inputs in the frequency domain. It serves as a bridge between the time-domain differential equations that describe system dynamics and the frequency-domain representation that facilitates easier manipulation and analysis.
To derive the transfer function, consider a general nth-order linear time-invariant...
1.5K
Nuclear Power02:36

Nuclear Power

9.3K
Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
Nuclear Fuels
Nuclear fuel consists of a fissile isotope, such as uranium-235, which must be present in sufficient quantity to provide a...
9.3K
Power01:08

Power

12.9K
The concept of work involves force and displacement; meanwhile, the work-energy theorem relates the net work done on a body to the difference in its kinetic energy, calculated between two points on its trajectory. While none of these quantities or relations involves time explicitly, we know that the time available to accomplish work is often just as important as the amount of work itself. For example, sprinters in a race may have achieved the same velocity at the finish, therefore,...
12.9K

You might also read

Related Articles

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

Sort by
Same author

Clinical quality of breath-held T1-weighted breast MRI in the supine position.

European journal of radiology·2026
Same author

High-Resolution 2D versus 3D Lumbar Spine MRI Optimized with a Deep Learning Reconstruction Algorithm and Prototype Conformal Coil.

AJNR. American journal of neuroradiology·2026
Same author

Semi-supervision for clinical contrast-weighted image synthesis from magnetic resonance fingerprinting.

Magma (New York, N.Y.)·2026
Same author

A Dynamic Shim Approach for Correcting Eddy Current Effects in Diffusion-Prepared MRI Acquisition Using a Multi-Coil AC/DC Shim-Array.

Magnetic resonance in medicine·2026
Same author

DM-Net: a physics-model-independent direct mapping approach for calibration-free multi-coil MRI.

Research square·2025
Same author

Characterizing the imaging environment for supine breast MRI.

Magnetic resonance in medicine·2025

Related Experiment Video

Updated: Jan 20, 2026

Functional MRI in Conjunction with a Novel MRI-compatible Hand-induced Robotic Device to Evaluate Rehabilitation of Individuals Recovering from Hand Grip Deficits
07:34

Functional MRI in Conjunction with a Novel MRI-compatible Hand-induced Robotic Device to Evaluate Rehabilitation of Individuals Recovering from Hand Grip Deficits

Published on: November 23, 2019

8.4K

An MRI Compatible RF MEMs Controlled Wireless Power Transfer System.

Kelly Byron1, Simone A Winkler2, Fraser Robb3

  • 1Department of Electrical and Computer Engineering, Stanford University, Stanford, CA 94305 USA.

IEEE Transactions on Microwave Theory and Techniques
|August 20, 2019
PubMed
Summary

A new wireless power transfer (WPT) system using microelectromechanical RF switches (RF MEMs) enables powering wearable MRI coils. This technology is feasible for MRI scanners, achieving high efficiency and minimal image quality degradation.

Keywords:
Impedance matchingMicroelectromechanical systems (MEMs)Wireless power transfer (WPT)

More Related Videos

Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing
07:13

Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing

Published on: October 20, 2021

3.9K
In Vivo Wireless Optogenetic Control of Skilled Motor Behavior
07:52

In Vivo Wireless Optogenetic Control of Skilled Motor Behavior

Published on: November 22, 2021

3.8K

Related Experiment Videos

Last Updated: Jan 20, 2026

Functional MRI in Conjunction with a Novel MRI-compatible Hand-induced Robotic Device to Evaluate Rehabilitation of Individuals Recovering from Hand Grip Deficits
07:34

Functional MRI in Conjunction with a Novel MRI-compatible Hand-induced Robotic Device to Evaluate Rehabilitation of Individuals Recovering from Hand Grip Deficits

Published on: November 23, 2019

8.4K
Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing
07:13

Implantation and Control of Wireless, Battery-free Systems for Peripheral Nerve Interfacing

Published on: October 20, 2021

3.9K
In Vivo Wireless Optogenetic Control of Skilled Motor Behavior
07:52

In Vivo Wireless Optogenetic Control of Skilled Motor Behavior

Published on: November 22, 2021

3.8K

Area of Science:

  • Engineering
  • Medical Imaging
  • Electromagnetics

Background:

  • Wearable wireless receive coil arrays are crucial for advancing magnetic resonance imaging (MRI).
  • Realizing this technology necessitates an MRI-compatible wireless power transfer (WPT) system.
  • Such a system must endure the MRI scanner's electromagnetic environment without compromising image quality.

Purpose of the Study:

  • To develop and evaluate an MRI-compatible WPT system for wearable MRI coils.
  • To address challenges of high magnetic fields and RF interference in MRI scanners.
  • To ensure the WPT system does not degrade MRI image quality.

Main Methods:

  • Development of a WPT system utilizing novel microelectromechanical RF switch (RF MEMs) technology.
  • Implementation of a class-E power amplifier, RF MEMs automated impedance matching, and RF MEMs power steering.
  • Design of a flexible secondary coil with class E rectification, incorporating techniques for high magnetic field operation and RF interaction mitigation.
  • Strategies for noise and harmonic interference suppression, including gating, filtering, and advanced rectifier topologies.

Main Results:

  • The WPT system achieved 63% efficiency, delivering over 13 W at a 3.5 cm coil distance.
  • Continuous WPT beyond 5W with filters and full-wave class E rectification achieved 32% of ideal image signal-to-noise ratio (SNR).
  • RF-gated WPT, interrupting power during MRI acquisition, achieved SNR performance within 1 dB of the ideal.

Conclusions:

  • The developed WPT system demonstrates feasibility for integration into MRI scanners.
  • RF MEMs technology effectively addresses challenges in MRI WPT system design.
  • Optimized WPT strategies, particularly RF-gating, can preserve MRI image quality.