Low-noise magnetic resonance imaging using low harmonic pulse sequences

摘要

Systems and method for magnetic resonance imaging are disclosed which utilize sinusoidal gradient waveforms to drive gradient coils in an MRI system. The sinusoidal gradient waveforms may be applied on all two or more (e.g. three) gradient axes to produce a relatively pure acoustic tone. In certain embodiments, gradient directions may be spiraled in three-dimensions to generate a radial pin-cushion k-space trajectory.

主权项

1. A method for driving gradient coils of a magnetic resonance imaging system, comprising:
driving at least a first gradient coil associated with a first gradient direction using a first sinusoidal gradient waveform and a second gradient coil associated with a second gradient direction using a second sinusoidal gradient waveform; generating RF pulses at one or more crossover events when the first sinusoidal gradient waveform and the second sinusoidal gradient waveform cross their respective gradient zero lines; acquiring a respective readout signal after each RF pulse; and generating an image using the acquired readout signals.