Evaluation of spiral trajectories for very low field MR imaging of the brain
pavan poojar1, Imam Ahmed Shaik1, Girish Koulagi1, Seema S Bhat1, and Sairam Geethanath1,2
1Medical Imaging Research Centre, Dayananda Sagar Institutions, Bangalore, India, 2Dept. of Radiology, Columbia University Medical Center, New York, NY, United States
Very low field (VLF) MRI systems provide cost effective, accessible solutions for brain imaging. However, VLF MRI typically suffers from significantly lower signal-to-noise ratio and hence longer acquisition times. This work explores the utilization of spiral acquisitions at VLF as it provides efficient sampling of kspace and accelerated acquisitions compared to Cartesian trajectories. Spiral trajectories were designed for 10mT without violating the hardware constraints resulting in potential accelerated acquisitions. Retrospective reconstruction of brain images was performed using Non uniform Fast Fourier Transform and Graphical Programming Interface. Future work involves prospective implementation on a home built scanner being currently pursued.
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