Nii Okai Addy1, Holden H. Wu1,2,
Dwight G. Nishimura1
1Electrical Engineering, Stanford
University, Stanford, CA, United States; 2Cardiovascular Medicine,
Stanford University, Stanford, CA, United States
MR
system imperfections limit the accuracy with which gradient waveforms of fast
imaging trajectories such as spirals and 3D cones, are generated on the
scanner. This mainly results in a delay of achieved k-space trajectories from
the theoretical case. It is possible to measure the system delays for each
axis and manually adjust the timing of the gradients to improve image
reconstruction. However, a range of delay values can be observed on a single
axis. This work models the gradient system with a linear time invariant model
for accurate estimation of a range of gradient waveforms generated on the
scanner.