ArticleMagnetic resonance in medicine2025
Ultra-high temporal resolution 4D angiography using arterial spin labeling with subspace reconstruction.
Article in Magnetic resonance in medicine, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- Velocity Spectrum Imaging Using Velocity Encoding Preparation Pulses.Magnetic resonance in medicine · 2026Article
- Combined angiography and perfusion using radial imaging and arterial spin labeling with structural contrast.Magnetic resonance in medicine · 2026Article
- Ultra-high temporal resolution 4D angiography using arterial spin labeling with subspace reconstruction.Magnetic resonance in medicine · 2025Article
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Authors and funding
6 authors.
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Abstract
purposeTo achieve ultra-high temporal resolution non-contrast 4D angiography with improved spatiotemporal fidelity.
methodsContinuous data acquisition using 3D golden-angle sampling following an arterial spin labeling preparation allows for flexibly reconstructing 4D dynamic angiograms at arbitrary temporal resolutions. However, k-space data is often temporally "binned" before image reconstruction, negatively affecting spatiotemporal fidelity and limiting temporal resolution. In this work, a subspace was extracted by linearly compressing a dictionary constructed from simulated curves of an angiographic kinetic model. The subspace was used to represent and reconstruct the voxelwise signal timecourse at the same temporal resolution as the data acquisition without temporal binning. Physiological parameters were estimated from the resulting images using a Bayesian fitting approach. A group of eight healthy subjects were scanned and the in vivo results reconstructed by different methods were compared. Because of the difficulty of obtaining ground truth 4D angiograms with ultra-high temporal resolution, the in vivo results were cross-validated with numerical simulations.
resultsThe proposed method enables 4D time-resolved angiography with much higher temporal resolution (14.7 ms) than previously reported (˜50 ms) while maintaining high spatial resolution (1.1 mm isotropic). Blood flow dynamics were depicted in greater detail, thin vessel visibility was improved, and the estimated physiological parameters also exhibited more realistic spatial patterns with the proposed method.
conclusionIncorporating a subspace compressed kinetic model into the reconstruction of 4D ASL angiograms notably improved the temporal resolution and spatiotemporal fidelity, which was subsequently beneficial for accurate physiological modeling.
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