MITS Gradient
Medical Implant Test System for LF Gradient EMC & Heating Tests
The Medical Implant Test Systems (MITS) are designed to simulate highprecision worst-case low frequency (LF) electromagnetic compatibility (EMC) and heating conditions for implants within commercial 1.5T and 3.0T machines to rigorously test the compatibility of medical implants with MRI gradient fields. The system has been designed to deliver performance exceeding the requirements of the AIMD MR Compatibility Standard, thereby delivering exposure levels of >120T/s peak.
MITS Gradient EMC are compatible with EMC test sequences and provide excellent gradient field homogeneity of less than 5 % within the volume of > 200 mm diameter by 100 mm high with better than 1 % for the location of the AMID during testing. The rugged construction of Helmholtz coils allows vertical usage and access for evaluations. The test system is calibrated and fully characterized experimentally. The open user interface allows customized, automated EMC and heating evaluations.
| Volume over which < ± 5 % variation | > 200 mm diameter x 100 mm high |
| Dimensions | 480 mm diameter x 390 mm high |
| Max continuous current | 100 A rms |
| Peak current | ± 200A |
| Field coil current calibration factor | 134 µT/A |
| Operating Frequencies | up to 5 kHz |
| Typical RMS dB/dt continuous | > 100 T/s (2 kHz sinusoid) |
| Peak dB/dt | > 125 T/s |
| Waveforms | Sinusoid, trapezoid, triangle arbitrary waveforms, heating and EMC waveforms |
MITS Gradient coil
Numerical Model of MITS Gradient coil