Shellock F G, Crues J V
Radiology. 1987 Apr;163(1):259-62. doi: 10.1148/radiology.163.1.3823445.
Temperature, heart rate, and blood pressure responses to high-field-strength magnetic resonance (MR) imaging were studied in 50 patients who underwent procedures at exposures to radiofrequency radiation above the present recommended whole-body average specific absorption rate (SAR) of 0.4 W/kg. Body temperature significantly increased an average of 0.2 degrees C. The highest body temperature recorded after MR imaging was 37.5 degrees C. There was no significant correlation between the change (before and after imaging) in body temperature and whole-body average SARs. Changes in skin temperatures were variable, depending on anatomic site. The largest change was 3.5 degrees C, and the highest skin temperature recorded after imaging was 35.1 degrees C. There was a modest correlation between the change in skin temperatures and whole-body average SARs. Average heart rate and average mean blood pressure measured immediately before imaging were not significantly different afterward. High-field-strength MR imaging at the whole-body average SARs of 0.42-1.2 W/kg studied was not associated with any temperature- or hemodynamic-related deleterious effects.
对50例接受高于目前推荐的全身平均比吸收率（SAR）0.4W/kg射频辐射程序的患者，研究了其对高场强磁共振（MR）成像的体温、心率和血压反应。体温平均显著升高0.2摄氏度。MR成像后记录到的最高体温为37.5摄氏度。成像前后体温变化与全身平均SAR之间无显著相关性。皮肤温度变化各不相同，取决于解剖部位。最大变化为3.5摄氏度，成像后记录到的最高皮肤温度为35.1摄氏度。皮肤温度变化与全身平均SAR之间存在适度相关性。成像前即刻测量的平均心率和平均平均血压在成像后无显著差异。研究中全身平均SAR为0.42-1.2W/kg的高场强MR成像与任何温度或血流动力学相关的有害影响均无关。
