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3-T MRI shows similar fetal tissue heating to 1.5-T MRI under constant radiofrequency (RF) exposure. While peak temperatures may exceed limits with clinical 3-T RF exposures, the overall thermal dose remains within safe limits.

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Magnetic Resonance Imaging

Background:

  • 3-Tesla (3-T) MRI offers improved fetal imaging quality over 1.5-Tesla (1.5-T) MRI.
  • Concerns exist regarding potential increases in local tissue heating at 3-T MRI.

Purpose of the Study:

  • To evaluate fetal MRI radiofrequency (RF) safety at 3-T.
  • Compare simulated tissue heating at 3-T versus 1.5-T under constant RF exposure.
  • Assess tissue heating at 3-T using RF exposures from actual clinical fetal MRI scans.

Main Methods:

  • Utilized seven voxelized pregnant body models (30 ± 3 weeks GA, 27.8 ± 8.5 kg/m² BMI).
  • Collected maternal whole-body average specific absorption rate (wbSAR) data from 85 clinical 3-T fetal MRI examinations.
  • Performed factorial analysis of variance on maternal and fetal temperature measurements.

Main Results:

  • Constant RF exposure showed no significant difference in peak or average maternal/fetal temperatures between 3-T and 1.5-T.
  • Average fetal temperatures were slightly higher at 1.5-T (37.75 ± 0.06°C) compared to 3-T (37.70 ± 0.05°C).
  • Simulated peak temperatures at 3-T using clinical RF exposures exceeded recommended limits, but thermal dose remained below limits.

Conclusions:

  • Local tissue heating is comparable between 3-T and 1.5-T MRI for identical RF coil geometry and constant RF exposure.
  • While peak temperatures can exceed limits with realistic 3-T clinical exposures, the cumulative thermal dose is within safe parameters.