Magnetic field threshold for accurate electrocardiography in the MRI environment

Mihaela Jekic, Yu Ding, Roger Dzwonczyk, Patrick Burns, Subha V Raman, Orlando P Simonetti

Research output: Contribution to journalArticlepeer-review


Although the electrocardiogram is known to be nondiagnostic within the bore of any high-field magnet due to the magnetohydrodynamic effect, there are an increasing number of applications that require accurate electrocardiogram monitoring of a patient inside the MRI room but outside of the magnet bore. Magnetohydrodynamic effects on the ST segment of the electrocardiogram waveform were investigated in six subjects at magnetic field strengths ranging from 6.4 mT to 652 mT at the aortic midarch, and the electrocardiogram was found to be accurate at magnetic fields below 70 mT. This corresponds to a distance of 160 cm from the isocenter and 80 cm from the bore entrance for the 1.5-T MRI system used in this study. These results can be translated to any MRI system, with knowledge of the fringe field. Accurate electrocardiogram monitoring is feasible in close proximity to the MRI magnet, such as during and after pharmacologic or exercise stress, or interventional or surgical procedures performed in the MRI room.

Original languageEnglish
Pages (from-to)1586-91
Number of pages6
JournalMagnetic Resonance in Medicine
Issue number6
Publication statusPublished - Dec 2010


  • Adult
  • Blood Flow Velocity
  • Coronary Circulation
  • Electrocardiography
  • Electromagnetic Fields
  • Humans
  • Image Processing, Computer-Assisted
  • Linear Models
  • Magnetic Resonance Imaging
  • Patient Positioning
  • Signal Processing, Computer-Assisted


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