MRI B1 Measurement system

This system is the ﬁrst system that allows to measurethe B1+/- ﬁeld distribution in a real MRI system with a traceable absolute B-ﬁeld calibration with a measurement uncertainty of better than ±1 dB. The relative measurement uncertainties in terms of the axial ratio and the relative phase of the B1x and B1y are better than 0.4 dB and 3%, respectively. Especially, for latest developments in MRI RF coil design employing multi-transmit systems the presented MRI B1 mapping system will become an indispensable tool for validation and quality assurance.

Measure the B1+/- ﬁeld distribution in a real MRI system
Inside laboratory GPS testing using phantoms with realistic arm and leg movements e.g. walking and jogging
Performance assessment of medical devices with in- or on-body transmitters, wireless physiological sensors and fitness monitoring devices

Measurement uncertainty is better than ±1 dB
Uncertainties of the axial ratio is better than 0.4 dB
Relative phase of the B1x and B1y is better than 3%
Parasitic E/H sensitivity <-20 dB (at 2 GHz)
Dynamic Range >130 dB at 1 Hz, RBW: 0.3 µA/m -1 A/m
Fully compatible with MRI environments up to 9 T.

MRI B1 Measurement system

MRI B1 Measurement system

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