Open source software and hardware project of a transmitter and RF amplifier for traditional and rotating magnetic resonance imaging
Blücher Christian1, Han Haopeng1, Hoffmann Werner1, Seemann Reiner2, Seifert Frank2, Niendorf Thoralf1,3,4, Hasselwander Christopher5, Grissom William5, Winter Lukas2
~2000€ (RF power amplifier)
CERN OHL v1.2, prototype
The spectrometer or software defined radio is capable of producing arbitrary shaped RF-pulses, un-/blanking the RFPA, recording acquired data and controlling a rotating
gradient field. Pulse length, amplitude, readout-length and –delay can be chosen freely.
The RFPA successfully amplied rect- and sinc-pulses generated by the spectrometer. A signal amplitude of 500mV at the input leads to an output voltage level of 200V which corresponds to a total gain factor of 52dB and a power level of 800W in a 50Ω system. The RFPA shows good linearity for the investigated frequency range f=1.8-54MHz (B =0.042-1.27T) with a maximum power output of around 1kW peak power.
The whole system occupies a volume of around (50x30x35)cm3.
Blücher C, Han H, Hoffmann W, Seemann R, Seifert F, Niendorf T, and Winter L, “COSI Transmit: Open Source Soft- and Hardware Transmission System for traditional and rotating MR”, Proc ISMRM, 2017, #184
1Berlin Ultrahigh Field Facility (B.U.F.F.), Max-Delbrück Center for Molecular Medicine in the Helmholtz Association, Berlin, Germany
2Physikalich-Technische Bundesanstalt (PTB), Berlin, Germany
3Experimental and Clinical Research Center (ECRC), a joint cooperation between the Charité medical faculty and the MDC-Berlin
4MRI.TOOLS GmbH, Berlin, Germany
5Vanderbilt University, Tennessee, USA