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 Experiment Videos

A 'Hi-Fi' Cartesian feedback spectrometer for precise quantitation and superior performance.

D I Hoult1, G Kolansky, D Kripiakevich

  • 1Institute for Biodiagnostics, National Research Council, 435 Ellice Avenue, Winnipeg, Man., Canada R3B 1Y6. david.hoult@nrc-cnrc.gc.ca

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|October 27, 2004
PubMed
Summary
This summary is machine-generated.

Related Concept Videos

You might also read

Related Articles

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

Sort by
Same author

Shim coil design by Fourier synthesis.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2025
Same author

The signal-to-noise ratio of the nuclear magnetic resonance experiment. 1976.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2011
Same author

The principle of reciprocity.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2011
Same author

Overcoming high-field RF problems with non-magnetic Cartesian feedback transceivers.

Magma (New York, N.Y.)·2007
Same author

The NMR multi-transmit phased array: a Cartesian feedback approach.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2004
Same author

The engineering of an interventional MRI with a movable 1.5 Tesla magnet.

Journal of magnetic resonance imaging : JMRI·2001
Same journal

Localization-driven exchange contrast in diffusion exchange spectroscopy.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2026
Same journal

4.5 Tesla superconducting miniature magnet in liquid nitrogen.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2026
Same journal

Folding and unfolding dynamics of a DNA aptamer studied by heteronuclear <sup>1</sup>H-<sup>13</sup>C correlation zz-exchange spectroscopy.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2026
Same journal

Multi-spin control from one-spin pulses.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2026
Same journal

Altering MRI rotating frame relaxations by changing the truncation level of Hyperbolic Secant pulse.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2026
Same journal

Effects of proton exchange on the lifetimes of long-lived states in aliphatic chains.

Journal of magnetic resonance (San Diego, Calif. : 1997)·2026
See all related articles

Cartesian electronic feedback significantly enhances magnetic resonance instrumentation. This innovation enables absolute calibration by making signal strength dependent only on nuclear count, improving data accuracy.

Area of Science:

  • Magnetic Resonance Spectroscopy
  • Instrumentation Engineering
  • Physical Chemistry

Background:

  • Traditional magnetic resonance instruments suffer from signal variations due to probe loading, matching, and tuning.
  • Phase and amplitude distortions, radiation damping, and probe vibration-induced modulation complicate data analysis.
  • Interactions between multiple probes at the same frequency reduce the efficiency of advanced configurations like phased arrays.

Purpose of the Study:

  • To report a major improvement in magnetic resonance instrumentation using Cartesian electronic feedback.
  • To eliminate dependencies of flip angle and signal strength on probe parameters.
  • To simplify the use of multiple probes and enable absolute calibration.

Main Methods:

  • Implementation of Cartesian electronic feedback control within the magnetic resonance instrument.

Related Experiment Videos

  • Characterization of signal strength and flip angle under varying probe conditions.
  • Assessment of phase/amplitude distortion, radiation damping, and probe interaction mitigation.

    • Main Results:

    • Dependencies of flip angle and signal strength on probe loading, matching, and tuning are virtually eliminated.
    • Free induction decay signal strength becomes solely dependent on the number of nuclei, enabling absolute calibration.
    • Phase/amplitude distortion, radiation damping, and probe vibration effects are minimized; probe interactions reduced by two orders of magnitude.

    Conclusions:

    • Cartesian electronic feedback provides a robust solution for enhancing magnetic resonance instrumentation performance.
    • The developed system allows for precise, absolute quantification of nuclear signals.
    • This advancement simplifies complex probe configurations and improves overall data reliability.