# KOSTAL

Interventional cardiac MRI needs reconstruction latency below 200 ms, while high image quality usually demands more sampling. KOSTAL places a recurrent network directly on undersampled golden-angle radial k-space, using the sampling mask to decide at each location whether to keep accumulated data or take the new spokes, then refines once in image space. On simulated OCMR data, 10-spoke frames reached a median SSIM of 0.907 versus 0.622 for 10-spoke gridding, in under 34 ms per frame.

Interventional cardiac MRI needs reconstruction latency below 200 ms, while high image quality usually demands more sampling. KOSTAL places a recurrent network directly on undersampled golden-angle radial k-space, using the sampling mask to decide at each location whether to keep accumulated data or take the new spokes, then refines once in image space. On simulated OCMR data, 10-spoke frames reached a median SSIM of 0.907 versus 0.622 for 10-spoke gridding, in under 34 ms per frame.