Direct MRI Detection at 3T Using an FPGA-Controlled High-Speed Digital Receiver
Jesmanowicz A, Hyde J
Medical College of Wisconsin
A new digital receiver with two A/D converters sampling at 100 MHz was implemented for off-line real-time image acquisition. One of the converters directly digitized the RF signal and the other digitized the internal reference waveform. The dynamic range of the A/D converter can be increased to 20 bits at a final output bandwidth 12.2 kHz. All processing, including filtering, mixing, and FT, were done by computer. For an N-channel acquisition system, one needs only N+1 A/D converters.