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Related Concept Videos

¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
IR Spectrum Peak Intensity: Dipole Moment01:20

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The dipole moment of a bond is the product of the partial charge on either atom and the distance between them. Dipole moments influence the efficiency of IR absorption and the peak intensity. When a bond with a dipole moment is placed in an electric field, the direction of the field determines if the bond is compressed or stretched. Electromagnetic radiation consists of an electric field component that rapidly reverses direction. It follows that polar bonds are alternately stretched and...

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Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization
05:54

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Published on: September 8, 2023

Polar decomposition radio-frequency current density imaging.

Angela W Ma1, Dinghui Wang, Tim P Demonte

  • 1Department of Electrical and Computer Engineering, University of Toronto, ON M5S 3G9, Canada. weijing.ma@utoronto.ca

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|November 25, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces improved Polar Decomposition Radio-frequency Current Density Imaging (PD-RFCDI) to overcome limitations in measuring radio-frequency current density. The new method removes previous current constraints, enabling broader applications in MRI.

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Electromagnetism

Background:

  • Polar Decomposition Radio-frequency Current Density Imaging (PD-RFCDI) is an MRI technique for non-invasive RF current density measurement.
  • Existing PD-RFCDI methods face limitations due to strict applied current constraints and interference from induced currents.

Purpose of the Study:

  • To develop and validate solutions addressing the limitations of PD-RFCDI.
  • To remove the strict current constraints and mitigate interference issues in PD-RFCDI.

Main Methods:

  • Proposed novel solutions to overcome PD-RFCDI limitations.
  • Validated the enhanced PD-RFCDI technique using both computational simulations and experimental studies.
  • Utilized a clinical MRI scanner for verification.

Main Results:

  • Successfully removed the strict current constraints previously associated with PD-RFCDI.
  • Demonstrated the feasibility and validity of the improved PD-RFCDI technique.
  • Verified the technique's performance on a clinical MRI scanner.

Conclusions:

  • The developed solutions effectively address the limitations of PD-RFCDI.
  • The enhanced PD-RFCDI technique offers a more flexible and robust approach for measuring RF current density.
  • This advancement holds promise for improved non-invasive imaging applications in MRI.