The Seiffert spirals trajectory has favorable properties for hyperpolarized 13C MRI. It allows for high degrees of undersampling and combined conjugate gradient compressed sensing SENSE reconstruction when multi-channel arrays are used. The trajectory was evaluated in simulations, in phantom, and for in vivo hyperpolarized 13C-urea MRI of pig kidneys with retrospective undersampling and high temporal resolution. For single-frequency imaging, flexible acceleration is achieved through reconstruction based on any number and combination of spiral arms. Simulations demonstrated noise-like aliasing and successful reconstruction. The in vivo experiment showed improved characterization of urea dynamics after undersampling. The reconstruction algorithm can be further improved.
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