Magnetic resonance imaging signal generating system

摘要

A magnetic resonance imaging signal generating system for controlling the frequency and phase of a high frequency signal capable of use in connection with rotating specific atomic nuclei and/or demodulating resultant magnetic resonance signals. The system includes a memory for storing digital signals which collectively represent the waveform of an analog signal and a mechanism for reading those digital signals from the memory by accessing addresses of the memory at a rate responsive to a frequency control signal to produce a series of digital signals which represent the analog signal having an angular frequency which is a function of the frequency control signal. An offset circuit is provided for offsetting the addresses of the memory means accessed by the reading mechanism in response to the phase control signal. The output of the memory means is used to efficiently and effectively alter the phase and angular frequency of that high frequency signal.