Shellock F G, Schaefer D J, Kanal E
Department of Radiological Sciences, UCLA School of Medicine.
Radiology. 1994 Sep;192(3):865-8. doi: 10.1148/radiology.192.3.8058962.
To assess the physiologic responses to a magnetic resonance (MR) procedure performed at a whole-body-averaged specific absorption rate (SAR) of 6.0 W/kg.
Tympanic membrane temperature, skin temperature at seven sites, heart rate, blood pressure, oxygen saturation, and cutaneous blood flow in six volunteers were assessed before, for 16 minutes during, and immediately after MR imaging performed at 1.5 T, 64 MHz.
Statistically significant (P < .05) 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 study subjects.
MR imaging procedures performed at the high SAR studied can be tolerated by persons with normal thermoregulatory function.
评估在全身平均比吸收率（SAR）为6.0W/kg的情况下进行磁共振（MR）检查时的生理反应。
在6名志愿者中，于1.5T、64MHz磁共振成像检查前、检查期间16分钟以及检查后即刻，对鼓膜温度、7个部位的皮肤温度、心率、血压、血氧饱和度和皮肤血流量进行评估。
鼓膜以及胸部、腹部、上臂、手部和大腿皮肤的温度、心率和皮肤血流量在统计学上显著升高（P<0.05），这些均与高SAR暴露有关。然而，这些生理变化均未被认为对研究对象有害。
具有正常体温调节功能的人能够耐受在本研究的高SAR下进行的磁共振成像检查。
