Development of a digital MRI console using general purpose digital instruments and board computers

A digital MRI console for a 1.0 T MRI system was developed using a digital oscilloscope, an arbitrary waveform generator, and board computers. Pulse sequences were generated by the board computers in the 20 us resolution, which triggered other instruments. The waveform generator directly generated Larmor frequency (43.85 MHz) RF pulse but the oscilloscope sampled the detected 43.85 MHz NMR signal using the under sampling technique at 6.9 MHz. Unreproducible phase scrambling cased by independent time-base used in each instruments was successfully recovered using the RF pulse simultaneously sampled, which proved a promise of our system.

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