A KomaMRI Phantom Extension for Integrated Dynamic Imaging

Motivation: KomaMRI is a newly released Pulseq-compatible MRI simulator. Albeit the simulator includes dynamic imaging, motion type is limited to analytical expressions. Goal(s): To provide KomaMRI with additional dynamic properties irrespective of the motion type. Approach: To expand the phantom class to account for sampled arbitrary trajectories and to interpolate spin positions at time instants needed for the simulation. The simulation kernel is valid almost “as is” and only the demagnetization of the spins leaving the volume needs to be accounted for. Results: 2D Cardiac cine with bright-blood effect, tagging and flow both with in-house and XCAT phantoms are dealt with now in KomaMRI. Impact: KomaMRI is expected to be used for designing and testing novel pulse sequences. The added capabilities provided by the extension we propose increase its potential associated by enabling the simulator to deal with any sort of motion for sequence design.