Generating spiral gradient waveforms with a compact frequency spectrum
James G. Pipe, Daniel D. Borup
Abstract
Purpose
To generate efficient gradient waveforms for spiral MRI which mitigate the high-frequency attenuation inherent in gradient systems.
Theory and Methods
Spiral MRI has many clinical advantages, including high temporal and SNR efficiency. One of the challenges for robust spiral MRI is a high sensitivity to imperfections in the gradient system, which requires some form of correction in order to map data correctly in k-space. A previous numerical algorithm for generating spiral gradient waveforms was modified to reduce its high-frequency content with minimal increase in waveform duration.
Results
Examples are shown of compact frequency gradient waveforms. Software implementing the algorithm is made available.
Conclusion
An algorithm to produce gradient waveforms with a compact frequency spectrum is described. This algorithm results in greatly reduced overall error and better compatibility with gradient systems than the original algorithm from which it was derived.