Fast, Variable System Delay Correction for Spiral Trajectories

Payal Sharad Bhavsar¹, Nicholas Ryan Zwart¹, James Grant Pipe¹

Spiral encoding methods may exhibit image artifacts due to system delays and eddy current. This papers extends a previous approach to estimate time-varying system delays for stack-of-spirals based trajectories, reducing the computational time by a factor of 30. The proposed method is very fast, easy to implement, includes gradient coupling effects, is robust to off-resonance, and estimates delays for each gradient channel over the data acquisition time.