Safety Tests for Systems Monitoring Local SAR

摘要

In order to provide online monitoring of local specific absorption rate (SAR) within a body subject to a magnetic resonance imaging (MRI) scan, directional couplers measure a phase and an amplitude of a transmission radio frequency (RF) pulse generated and transmitted by an MRI system. A measured local SAR value is calculated based on the measured phase and the measured amplitude of the transmission RF pulse using a voxel model of the body and an electromagnetic (EM) simulation. In order to verify proper operation of the local SAR monitoring, the measured local SAR value is compared to a predetermined local SAR value.

主权项

1. A method for testing a system for monitoring local specific absorption rate (SAR) for a body within a magnetic resonance imaging (MRI) system, the method comprising:
receiving a measured phase and a measured amplitude of a transmission radio frequency (RF) pulse generated and transmitted by the MRI system; calculating, by a processor, a measured local SAR value based on the measured phase and amplitude of the transmission RF pulse; and verifying operation of the system for monitoring local SAR, the verifying comprising comparing the measured local SAR value to a predetermined local SAR value.