The Leon mri has been specially developed for use in the MRI area with field strengths of up to 40 millitesla. It can be operated on 1.5 tesla and 3.0 tesla MRI systems. Different coloured alarms and messages indicating the priority can be easily recognised due to LED lights, which are visible from all sides, also outside the MR field. Power spectrum of the Leon mri: Both the power spectrum and the operation of the Leon mri, match exactly, without any restrictions, those of the already well-established Leon. A further major logistic advantage can be found in the compatibility of the compact circuit system with the Leon plus, Leon and Leon mri systems. The position to MRI is monitored by an integrated magnetic field strength monitor.