Study type: Medical/biological study (experimental study)

Physiologic responses to an MR imaging procedure performed at a specific absorption rate of 6.0 W/kg med./bio.

By: Shellock FG, Schaefer DJ, Kanal E
Published in: Radiology 1994; 192 (3): 865-868
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Aim of study (acc. to author)

To study the physiologic responses to a magnetic resonance procedure (MRI) performed at a whole-body averaged specific absorption rate (SAR) of 6.0 W/kg.

Endpoint

Exposure

Exposure Parameters
Exposure 1: 64 MHz
Exposure duration: 16 min

Exposure 1

Main characteristics
Frequency 64 MHz
Type
Exposure duration 16 min
Exposure setup
Exposure source
Setup Each volunteer was positioned in the MR system so that the umbilicus was at the center of the coil.
Parameters
Measurand Value Type Method Mass Remarks
SAR 6 mW/g mean measured and calculated whole body -
magnetic flux density 1.5 T - - - -

Exposed system:

Methods Endpoint/measurement parameters/methodology

Investigated system:
Investigated organ system:
Time of investigation:
  • during exposure
  • after exposure

Main outcome of study (acc. to author)

Statistically significant increases in temperature of the tympanic membrane and the skin of the chest, abdomen, upper arm, hand, and thigh and in heart rate and cutaneous blood flow were associated with exposure to high SAR. None of these physiologic changes, however, were considered deleterious to the subjects. Magnetic resonance imaging (MRI) procedures performed at the high SAR examined can be tolerated by persons with normal thermoregulatory function.

Study character:

Study funded by

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