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

1.0K
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...
1.0K
Transmission Line Design Considerations01:23

Transmission Line Design Considerations

669
Aluminum has become the material of choice for overhead transmission lines, surpassing copper due to its abundance and cost-effectiveness. The most prevalent type is the aluminum conductor, steel-reinforced (ACSR), which combines aluminum strands around a steel core. Other variants include all-aluminum conductors (AAC), all-aluminum alloy conductors (AAAC), aluminum conductor alloy-reinforced (ACAR), and aluminum-clad steel conductors. Advanced designs, such as aluminum conductors with steel...
669
Power Factor Correction01:20

Power Factor Correction

589
The power transmission to a factory involves the transfer of apparent power, a combination of active and reactive power. The power factor measures how effectively electrical power is converted into useful work output. The ratio of the real power (KW) that does the work to the apparent power (KVA) supplied to the circuit.
589
Extraction: Partition and Distribution Coefficients01:14

Extraction: Partition and Distribution Coefficients

5.2K
The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
For extracting a solute from an aqueous phase into an...
5.2K
Voltage Dividers01:14

Voltage Dividers

1.4K
In electrical circuits, resistors can be connected in series, sequentially linked one after the other. In a series configuration, the same current flows through each resistor. Ohm's law is a fundamental principle to understand the behavior of resistors in series. It expresses the voltage across these resistors in terms of the current and resistance.
Kirchhoff's voltage law implies that the sum of the voltages across the resistors in series equals the source voltage. This means that the current...
1.4K
Cascaded Op Amps01:16

Cascaded Op Amps

1.2K
Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
1.2K

You might also read

Related Articles

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

Sort by
Same author

Revisiting Inductively Coupled Wireless Coils in MRI: Mitigating Over-Coupling With Preamplifiers.

Magnetic resonance in medicine·2026
Same author

Cross-Scale Self-Supporting Carbon Anode for Fast and Reversible Potassium Storage at Low Voltage.

Small (Weinheim an der Bergstrasse, Germany)·2026
Same author

Dynamics and drivers of aerobic methane oxidation in water of a shallow eutrophic lake.

Journal of environmental management·2026
Same author

Anti-inflammatory treatment confirms rsfMRI and TSPO PET as biomarkers of functional connectivity and neuroinflammation in rat contusion spinal cord injuries.

Scientific reports·2026
Same author

Optimizing Selective RF Pulses for Enhanced Signal Stability in Turbo Spin Echo Using a Differentiable Extended Phase Graph Model.

Magnetic resonance in medicine·2026
Same author

Fast electromagnetic and RF circuit co-simulation for passive resonator field calculation and optimization in MRI.

Magnetic resonance imaging·2026
Same journal

A Comparison of Tissue Property Values Estimated Using Conventional Cardiac MRF and MT-Cardiac MRF.

Magnetic resonance in medicine·2026
Same journal

Dependence of the Extra-Cellular Diffusion Coefficient on the Fractions of Neurites and Cell Bodies in Gray Matter.

Magnetic resonance in medicine·2026
Same journal

Triple-Pulse <sup>23</sup>Na MRI Sequence (TriNa) for Simultaneous Acquisition of Spin-Density-Weighted and Fluid-Attenuated Images.

Magnetic resonance in medicine·2026
Same journal

Evaluation of Phantom Doping Materials in Quantitative Susceptibility Mapping.

Magnetic resonance in medicine·2026
Same journal

Design of an 8-Channel Transmit 32-Channel Receive 11.7T Head Coil and Evaluation of SNR Gains.

Magnetic resonance in medicine·2026
Same journal

The Potential for Absolute Temperature Imaging Based on Brain Metabolites Using an FID-Shifting Approach in Gradient Echo Planar Spectroscopic Imaging (GREPSI).

Magnetic resonance in medicine·2026
See all related articles

Related Experiment Video

Updated: Feb 25, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

7.9K

Ratio-adjustable power splitters for array-compressed parallel transmission.

Xinqiang Yan1,2, Zhipeng Cao1,3, William A Grissom1,2,3,4

  • 1Vanderbilt University Institute of Imaging Science, Nashville, Tennessee, USA.

Magnetic Resonance in Medicine
|August 1, 2017
PubMed
Summary
This summary is machine-generated.

New ratio-adjustable power splitters (RAPS) reduce power loss in array-compressed parallel transmission (acpTx) systems. This technology enables efficient driving of multiple coils from a single channel, significantly cutting excitation errors.

Keywords:
MR engineeringRF coilsRF pulse designarray compressionoptimizationparallel transmissionselective excitationultra-high field MRI

More Related Videos

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

10.4K
Author Spotlight: Introduction to Active Probe Atomic Force Microscopy with Quattro-Parallel Cantilever Arrays
05:04

Author Spotlight: Introduction to Active Probe Atomic Force Microscopy with Quattro-Parallel Cantilever Arrays

Published on: June 13, 2023

2.5K

Related Experiment Videos

Last Updated: Feb 25, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

7.9K
Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
09:43

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

Published on: March 20, 2017

10.4K
Author Spotlight: Introduction to Active Probe Atomic Force Microscopy with Quattro-Parallel Cantilever Arrays
05:04

Author Spotlight: Introduction to Active Probe Atomic Force Microscopy with Quattro-Parallel Cantilever Arrays

Published on: June 13, 2023

2.5K

Area of Science:

  • Magnetic Resonance Imaging
  • Electrical Engineering
  • Signal Processing

Background:

  • Array-compressed parallel transmission (acpTx) uses fewer channels to drive more coils.
  • Traditional acpTx networks suffer high power dissipation due to power splitters and attenuators.
  • Optimizing coil-to-channel combinations is crucial for efficient acpTx.

Purpose of the Study:

  • To implement and validate low-loss ratio-adjustable power splitters (RAPS) for acpTx.
  • To develop a more efficient array compression network for parallel transmission.

Main Methods:

  • Developed RAPS circuits combining power splitting and relative attenuation with low insertion loss.
  • Experimentally validated RAPS circuits.
  • Constructed an acpTx network using RAPS for a one-channel-to-four-coil spiral excitation experiment.

Main Results:

  • RAPS circuits achieved output ratios within 0.05 dB of desired values.
  • Power dissipation in the RAPS network was approximately 0.5 dB (10%).
  • The acpTx experiment reduced excitation error by 46% compared to single-coil driving.

Conclusions:

  • RAPS circuits enable the construction of low-loss array compression networks for parallel transmission.
  • This technology improves the efficiency and reduces power consumption in acpTx systems.
  • RAPS facilitates optimal multi-coil excitation with reduced complexity.