Mark Chiew

Dec 23, 2024 | mdpi.com | Mark Chiew

1. IntroductionMagnetic resonance imaging (MRI) has excellent soft tissue contrast and is the gold standard modality for a number of clinical applications. A hindrance of MRI, however, is its lengthy acquisition time, which is especially challenging when high spatio-temporal resolution is required, such as for dynamic imaging [1].

Aug 26, 2024 | biorxiv.org | Qijia Shen |Wenchuan Wu |Mark Chiew |Yang Ji

AbstractMotion artifacts are problematic in many MRI modalities. Self-navigating approaches are desirable, since no additional scan time or hardware is required. However, the generation of a navigator image, to estimate and correct motion, is difficult in cases where the tissue contrast is changing during the navigator acquisition window, such as in magnetization-prepared methods.

Jul 5, 2024 | biorxiv.org | Qijia Shen |Wenchuan Wu |Mark Chiew |Yang Ji

AbstractPurpose: To achieve ultra-high temporal resolution non-contrast 4D angiography with improved spatiotemporal fidelity. Methods: Continuous 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.