Optimal k-space under sampling parttern in iterative recounstruction for radial fast spin echo MRI based on point spread function evaluation

Motivation: Radial FSE MRI is valued for motion insensitivity but requires longer acquisition times due to overlapping central k-space sampling. Optimal k-space sampling patterns for radial FSE are yet to be fully explored. Goal(s): To propose an optimal k-space sampling pattern based on PSF evaluation to improve image quality for radial FSE MRI. Approach: Simulate an radial FSE sequence, optimizing the sampling pattern by minimizing PSF differences, and evaluating image quality via NMSE against a conventional reference. Results: The proposed sampling pattern suppressed artifacts better, reducing NMSE from 0.00174 to 0.000845, with increased sampling density near the blade center and a narrower blade width. Impact: Improving acquisition speed in radial fast spin echo MRI with optimized k-space under sampling pattern and iterative reconstruction may enhance examination throughput and reduce patient burden while maintaining or enhancing image quality.