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Fiber-optic stethoscope: a cardiac monitoring and gating system for magnetic resonance microscopy.

Publication ,  Journal Article
Brau, ACS; Wheeler, CT; Hedlund, LW; Johnson, GA
Published in: Magn Reson Med
February 2002

A fundamental problem associated with using the conventional electrocardiograph (ECG) to monitor a subject's cardiac activity during magnetic resonance imaging (MRI) is the distortion of the ECG due to electromagnetic interference. This problem is particularly pronounced in MR microscopy (MRI of small animals at microscopic resolutions (< 0.03 mm(3))) because the strong, rapidly-switching magnetic field gradients induce artifacts in the animal's ECG that often mimic electrophysiologic activity, impairing the use of the ECG for cardiac monitoring and gating purposes. The fiber-optic stethoscope system offers a novel approach to measuring cardiac activity that, unlike the ECG, is immune to electromagnetic effects. The fiber-optic stethoscope is perorally inserted into the esophagus of small animals to optically detect pulsatile compression of the esophageal wall. The optical system is shown to provide a robust cardiac monitoring and gating signal in rats and mice during routine cardiac MR microscopy.

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Published In

Magn Reson Med

DOI

ISSN

0740-3194

Publication Date

February 2002

Volume

47

Issue

2

Start / End Page

314 / 321

Location

United States

Related Subject Headings

  • Stethoscopes
  • Rats
  • Optical Fibers
  • Nuclear Medicine & Medical Imaging
  • Myocardial Contraction
  • Microscopy
  • Mice, Inbred C57BL
  • Mice
  • Magnetic Resonance Imaging
  • Hemodynamics
 

Citation

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Brau, A. C. S., Wheeler, C. T., Hedlund, L. W., & Johnson, G. A. (2002). Fiber-optic stethoscope: a cardiac monitoring and gating system for magnetic resonance microscopy. Magn Reson Med, 47(2), 314–321. https://doi.org/10.1002/mrm.10049
Brau, Anja C. S., Charles T. Wheeler, Laurence W. Hedlund, and G Allan Johnson. “Fiber-optic stethoscope: a cardiac monitoring and gating system for magnetic resonance microscopy.Magn Reson Med 47, no. 2 (February 2002): 314–21. https://doi.org/10.1002/mrm.10049.
Brau ACS, Wheeler CT, Hedlund LW, Johnson GA. Fiber-optic stethoscope: a cardiac monitoring and gating system for magnetic resonance microscopy. Magn Reson Med. 2002 Feb;47(2):314–21.
Brau, Anja C. S., et al. “Fiber-optic stethoscope: a cardiac monitoring and gating system for magnetic resonance microscopy.Magn Reson Med, vol. 47, no. 2, Feb. 2002, pp. 314–21. Pubmed, doi:10.1002/mrm.10049.
Brau ACS, Wheeler CT, Hedlund LW, Johnson GA. Fiber-optic stethoscope: a cardiac monitoring and gating system for magnetic resonance microscopy. Magn Reson Med. 2002 Feb;47(2):314–321.
Journal cover image

Published In

Magn Reson Med

DOI

ISSN

0740-3194

Publication Date

February 2002

Volume

47

Issue

2

Start / End Page

314 / 321

Location

United States

Related Subject Headings

  • Stethoscopes
  • Rats
  • Optical Fibers
  • Nuclear Medicine & Medical Imaging
  • Myocardial Contraction
  • Microscopy
  • Mice, Inbred C57BL
  • Mice
  • Magnetic Resonance Imaging
  • Hemodynamics