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Stretched Radial Trajectory Design for Efficient MRI with Enhanced K-Space Coverage and Image Resolution
Li Song Gong1,2, Zihan Zhou2,3, Qing Li4
1Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA.
Bioengineering (Basel, Switzerland)
|November 27, 2025
Summary
This study introduces a novel stretched radial trajectory for Magnetic Resonance Imaging (MRI), improving image resolution by expanding k-space coverage without longer scan times. This technique enhances visualization of fine details in structural and quantitative imaging.
Area of Science:
- Medical Imaging
- Biophysics
- Radiology
Background:
- Magnetic Resonance Imaging (MRI) resolution is crucial for accurate diagnosis.
- Current methods to improve resolution often require longer scan times or specialized hardware.
- Expanding k-space coverage is key to enhancing MRI spatial resolution.
Purpose of the Study:
- To present a stretched radial trajectory design for enhanced MRI spatial resolution.
- To demonstrate improved k-space coverage without increasing readout duration or scan time.
- To validate the method's effectiveness in both phantom and in vivo experiments.
Main Methods:
- Developed a stretched radial trajectory by dynamically modulating gradient amplitudes.
- Achieved square k-space coverage in 2D and cubic coverage in 3D imaging.
- Validated using phantom and in vivo experiments on GE and Siemens scanners at 0.55 T and 3 T.
Main Results:
- Demonstrated improved image sharpness and clearer visualization of fine structures.
- Point spread function analysis confirmed enhanced resolution.
- Showcased improved T1 and T2 mapping accuracy in MRF acquisitions.
- Successfully visualized small phantom details and brain vasculature.
Conclusions:
- The stretched radial trajectory enhances MRI spatial resolution without additional scan time or hardware.
- The method is generalizable for both structural and quantitative MRI applications.
- Suitable for MRI systems with moderate gradient performance.
