| 摘要 |
<p>A scan controller for NMR imaging apparatus which stores control signals having high amplitude resolution for a variety of sequences using small amounts of memory, and which easily assembles any sequence. The waveforms of the control signals are stored in a waveform memory (101) while the amplitudes thereof are stored in an amplitude memory (102) in the order of events in the sequence, and the duration designating values thereof 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 thereof is converted through a first D/A converter (105) into an analog signal and is produced. At this moment, the amplitude of the output signal of the first 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).</p> |
