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OPTIKS: Optimized Gradient Properties Through Timing in k-Space
IEEE Transactions on Medical Imaging
|December 2, 2025
Summary
A new method called OPTIKS optimizes magnetic resonance imaging (MRI) gradient waveforms for faster scans. This design tool enhances speed while reducing side effects like nerve stimulation and acoustic noise.
Area of Science:
- Magnetic Resonance Imaging (MRI) Physics
- Biomedical Engineering
- Signal Processing
Background:
- Designing MRI gradient waveforms is complex, balancing speed with physical constraints.
- Existing methods may not fully optimize time-domain properties or account for multiple objectives.
Purpose of the Study:
- To develop a customizable method (OPTIKS) for designing fast, trajectory-constrained gradient waveforms.
- To optimize gradient waveform traversal speed and time-domain properties.
Main Methods:
- OPTIKS optimizes gradient waveform traversal speed based on k-space trajectory.
- It considers objectives like limiting peripheral nerve stimulation (PNS), minimizing mechanical resonance, and reducing acoustic noise.
- The method is applied to various trajectories (spirals, EPI, rosettes).
Main Results:
- Significant reductions in gradient coil back-electromotive force (up to 94%) and field oscillations (up to 91.1%).
- Acoustic noise decreased by up to 9.22 dB.
- Speed increases of up to 11.4% were achieved using PNS models.
Conclusions:
- OPTIKS provides an effective, customizable approach for designing optimized MRI gradient waveforms.
- The open-source implementation facilitates broader adoption and further research in faster, safer MRI acquisition.
