Abstract #0978

Accelerated 3D bSSFP Imaging for Treatment Planning on an MRI-Guided Radiotherapy System

Yu Gao^1,2, Ziwu Zhou¹, Fei Han¹, Percy Lee^2,3, Daniel Low^2,3, Peng Hu^1,2, and Yingli Yang^2,3

¹Radiology, University of California, Los Angeles, Los Angeles, CA, United States, ²Physics and Biology in Medicine IDP, University of California, Los Angeles, Los Angeles, CA, United States, ³Radiation Oncology, University of California, Los Angeles, Los Angeles, CA, United States

The purpose of this work is to introduce a compressed sensing and parallel imaging combined technique to reduce the acquisition time for planning MR. We implemented a variable-density Poisson-Disk under-sampled acquisition along with L1-ESPIRiT reconstruction technique on an MRI-guided radiotherapy system. Phantom study showed that our technique had superior image quality over the conventional GRAPPA approach. Patient and volunteer study demonstrated that comparable images can be acquired with half of the original time. In addition, the proposed technique was able to achieve high resolution imaging where the GRAPPA approach failed due to high noise level.

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