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Abstract #3187

Beachball: A fast and efficient 3D k-space trajectory with time optimal gradients

Pavan Poojar1 and Sairam Geethanath1

1Medical Imaging Research Centre, Dayananda Sagar College of Engineering, Bangalore, India

3D Variable density spiral (VDS)–“beachball” was designed and generated to cover 3D k-space efficiently. Beachball is obtained by rotating along one axis of a 2D VDS for various number of shots. Beachball was demonstrated in-silico by analyzing point spread function and restrospective analysis of a in-vitro water phantom. Reconstruction was done using NUFFT. Optimal gradient waveforms were generated for beachball by using convex optimization formulations based on the constraints of maximum gradient amplitude and slew rate. This trajectory provides for smoother coverage and densely sampled at the centre of k-space and allows implementation of silent MR.

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