Wireless Reference Implant
Description
Wireless reference implant hardware for safety testing in MRI. Small rms sensors embedded in active implantable medical devices (AIMD) can provide important safety relevant information that can be exploited e.g. by parallel transmission based MR techniques for improved measurement based, subject specific RF safety of implants in MRI. Such concepts require the AIMD to communicate wirelessly with the pTx-capable MR scanner. Here Bluetooth low energy (BLE)-based wireless implant hardware and a communication workflow are presented to perform a variaty of implant safety related investigations.
Specifications
Dimensions:
- Electronics box: 60 x 45 x 25 mm3
- Lead trajectory lengths: 600 mm for realistic trajectories, 600 mm for the extension wire
- Wire diameter: 2 mm
Connectivity & Measurement Capability:
- Bluetooth v5.2
- 7.8 μs sampling rate (5.3 μs ADC averaging)
- 7200 samples / 58 ms memory
- Calibrated linear RMS E-field measurement range: 0.06-1.6 V tested @123MHz (3T) and @297MHz (7T)
Other:
- 110 mAh battery capacity
- Trigger arm time 100 ms
Contacts
| Name | Institution | Applications | |
|---|---|---|---|
| Berk Silemek | berk.silemek@ptb.de | Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany | implant safety |
| Frank Seifert | frank.seifert@ptb.de | Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany | pTx and implant safety |
| Lukas Winter | lukas.winter@ptb.de | Physikalisch-Technische Bundesanstalt (PTB), Berlin, Germany | implant safety, open source hardware distribution |
Contributors (alphabetical order)
Frank Seifert, Berk Silemek, Lukas Winter
Publications
If you find this useful in your work, please cite: Silemek B, Seifert F, Ittermann B, Winter L, "Wireless reference implant and communication methodology to assess and investigate RF safety and pTx mitigation strategies for AIMDs", Proceedings ISMRM, 2022, #2009
Acknowledgments
This work has received funding from the EMPIR grant 17IND01 MIMAS. The EMPIR initiative is co-funded by the European Union's Horizon 2020 research and innovation program and the EMPIR participating states.
This work has received funding from the European Partnership on Metrology, co-financed by the European Union’s Horizon Europe Research and Innovation Programme and by the Participating States, under grant number 21NRM05 STASIS.
This work is supported by the Open Source Imaging Initiative (OSI²), http://www.opensourceimaging.org/project/wireless-reference-implant/
License and Liability
Please check the DISCLAIMER.pdf