ArticleIEEE transactions on medical imaging2016
Joint Design of Excitation k-Space Trajectory and RF Pulse for Small-Tip 3D Tailored Excitation in MRI.
Article in IEEE transactions on medical imaging, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 15 papers.
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Who cites it
15 citing papers in PubMed.
- SelExNet: A Self-Supervised Physics-Informed Framework for Multi-Channel Joint RF and Gradient Waveform Optimization in 2D Spatially Selective Excitation.Magnetic resonance in medicine · 2026Article
- The Ritz Adjoint Method for MRI Pulse Design.IEEE transactions on medical imaging · 2026Article
- In Vivo Meso-Scale Whole-Brain Quantitative Imaging With Tailored MRF on the NexGen 7T Scanner.Magnetic resonance in medicine · 2026Article
- Comprehensive 4D Parallel Transmission Spatial-Spectral Pulse Design for Slab-Selective Uniform Water-Selective Excitation: Demonstration in the Human Brain at 7 Tesla.Magnetic resonance in medicine · 2026Article
- Multidimensional RF pulse design using auto-differentiable spin-domain optimization and its application to reduced field-of-view imaging.Magnetic resonance in medicine · 2025Article
- Parallel-transmission spatial spectral pulse design with local specific absorption rate control: Demonstration for robust uniform water-selective excitation in the human brain at 7 T.Magnetic resonance in medicine · 2025Article
- Multiphoton parallel transmission (MP-pTx): Pulse design methods and numerical validation.Magnetic resonance in medicine · 2024Article
- FastPtx: a versatile toolbox for rapid, joint design of pTx RF and gradient pulses using Pytorch's autodifferentiation.Magma (New York, N.Y.) · 2024Article
- Stochastic optimization of three-dimensional non-Cartesian sampling trajectory.Magnetic resonance in medicine · 2023Article
- B-Spline Parameterized Joint Optimization of Reconstruction and K-Space Trajectories (BJORK) for Accelerated 2D MRI.IEEE transactions on medical imaging · 2022Article
- An efficient approach to optimal experimental design for magnetic resonance fingerprinting with B-splines.Magnetic resonance in medicine · 2022Article
- Selective RF excitation designs enabled by time-varying spatially non-linear ΔBMagnetic resonance in medicine · 2022Article
- Joint Design of RF and Gradient Waveforms via Auto-differentiation for 3D Tailored Excitation in MRI.IEEE transactions on medical imaging · 2021Article
- Automated design of pulse sequences for magnetic resonance fingerprinting using physics-inspired optimization.Proceedings of the National Academy of Sciences of the United States of America · 2021Article
- Rapid inner-volume imaging in the steady-state with 3D selective excitation and small-tip fast recovery imaging.Magnetic resonance in medicine · 2016Article
Corrections and comments
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4 authors.
Funding
Abstract
We propose a new method for the joint design of k-space trajectory and RF pulse in 3D small-tip tailored excitation. Designing time-varying RF and gradient waveforms for a desired 3D target excitation pattern in MRI poses a non-linear, non-convex, constrained optimization problem with relatively large problem size that is difficult to solve directly. Existing joint pulse design approaches are therefore typically restricted to predefined trajectory types such as EPI or stack-of-spirals that intrinsically satisfy the gradient maximum and slew rate constraints and reduce the problem size (dimensionality) dramatically, but lead to suboptimal excitation accuracy for a given pulse duration. Here we use a 2nd-order B-spline basis that can be fitted to an arbitrary k-space trajectory, and allows the gradient constraints to be implemented efficiently. We show that this allows the joint optimization problem to be solved with quite general k-space trajectories. Starting from an arbitrary initial trajectory, we first approximate the trajectory using B-spline basis, and then optimize the corresponding coefficients. We evaluate our method in simulation using four different k-space initializations: stack-of-spirals, SPINS, KT-points, and a new method based on KT-points. In all cases, our approach leads to substantial improvement in excitation accuracy for a given pulse duration. We also validated our method for inner-volume excitation using phantom experiments. The computation is fast enough for online applications.
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