2017 Imaging for Physicists Coursebook

Exposure Limits: RF

SAR

Whole body head Partial body* Local Body**

Local Extremity**

Normal

2 W/kg

3.2 3.2

2-10 4-10 > 10

10 20

20 40

Controlled

4

Research

> 4

> 3.2

> 20

> 40

Above are IEC 2010 limits with following notes: Over a time average 6 min; 10 s duration cannot exceed × 2 *scales as 10-8 × r where r is ratio of exposed mass to whole body mass **local SAR based on 10g tissue mass Assumes normal ambient temperature and humidity

Max increase (  C)

Body Temperature

Normal

0.5 1.0

Controlled

Research

> 1.0