Name
Abstract | ||
|---|---|---|
The purpose of this work is to correct for transient gradient waveform errors in magnetic resonance imaging (MRI), whether from eddy currents, group delay, or gradient amplifier nonlinearities, which are known to affect image quality. An iterative method is proposed to minimize error between desired and measured gradient waveforms, whose success does not depend on accurate knowledge of the gradient system impulse response. The method was applied to half-pulse excitation for 2-D ultra-short echo time (UTE) imaging on a small animal MRI system and to spiral 2-D excitation on a human 7T MRI system. Predistorted gradient waveforms reduced temporal signal variation caused by excitation gradient trajectory errors in 2-D UTE, and improved the quality of excitation patterns produced by spiral excitation pulses. Iterative gradient predistortion is useful for minimizing transient gradient errors without requiring accurate characterization of the gradient system impulse response. |
Year | DOI | Venue |
|---|---|---|
2014 | 10.1109/TMI.2014.2320987 | IEEE transactions on medical imaging |
Keywords | Field | DocType |
predistortion,group delay,iterative gradient predistortion,excitation gradient trajectory errors,image quality,gradient waveform measurement,2d ute imaging,transient gradient waveform errors,small animal mri system,gradient amplifier nonlinearity,gradient system impulse response,temporal signal variation,excitation,iterative method,biomedical mri,magnetic resonance imaging,magnetic resonance imaging (mri),gradients,half-pulse excitation,artefacts,2d ultrashort echo time imaging,spiral 2d excitation pulses,human mri system,eddy currents,iterative methods,mri gradient waveform predistortion | Impulse response,Image quality,Artificial intelligence,Eddy current,Trajectory,Computer vision,Iterative method,Waveform,Group delay and phase delay,Acoustics,Nuclear magnetic resonance,Predistortion,Mathematics | Journal |
Volume | Issue | ISSN |
33 | 8 | 1558-254X |
Citations | PageRank | References |
0 | 0.34 | 2 |
Authors | ||
3 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Kevin D. Harkins | 1 | 0 | 0.34 |
| Mark D. Does | 2 | 98 | 6.30 |
| William Grissom | 3 | 3 | 2.27 |