SCAN CONTROLLER FOR NMR IMAGING APPARATUS.

摘要

The scan controller has the waveforms of the control signals stored in a waveform memory (101) while the amplitudes of them are stored in an amplitude memory (102) in the order of events in the sequence. The duration designating values are stored in a time memory (103) in the order of events in the sequence. The waveform memory (101) is read by an address counter (104) which operates on clocks determined by values read from the time memory (103) and the output of it is converted through a D/A converter (105) into an analog signal and is produced. At this moment, the amplitude of the output signal of the D/A converter (105) is determined by applying a stored amplitude read from the amplitude memory (102) for every event as a fullscale value to the first D/A converter (105) through a second D/A converter (106).