Monitoring the exposure to magnetic fields of MRI workers using goggles integrating magnetometers

Abstract

This paper presents a measurement device to improve the investigations on physiological effects induced by strong magnetic fields. We have designed and prototyped a novel dosimeter and tested it on an MRI worker. The dosimeter consists of goggles integrating 3D magnetic sensors at several locations within their frame. MRI workers have prolonged and cumulative exposure to specific MRI related electromagnetic fields. MRI workers include cleaning personal, technicians, and therapists who execute tasks near the MRI tunnel. They can be exposed to a strong static magnetic field, up to 3T at the tunnel output. In cutting edge research facilities whole body MRI magnets can generate up to 11.7 T. This is higher than the 2T limit recommended by the ICNIRP guidelines. The challenge to collect specific magnetic field exposure data to better understand physiological effects is addressed by this study. Unlike existing pocket dosimeters, the proposed goggles provide a magnetic field map near the mostly impacted organs: the brain and the eyes. We carried out functional tests on an MRI worker performing typical movements around an MRL This unprecedently precise MRI dosimeter opens the way to new studies on MRI workers cohorts to better understand the physiological effects of magnetic fields.