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Abstract #2691

K-Space Trajectory Correction for UTE Sequence with Multi-Echo Radial Acquisition

Liao Ying1, Paul Kyu Han2, Shuang Hu2,3, Kui Ying4,5, Chao Ma2, and Georges El Fakhri2

1Biomedical Engineering, Tsinghua University, Beijing, China, 2Gordon Center for Medical Imaging, Radiology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States, 3Nuclear Medicine, West China Hospital, Sichuan University, Sichuan, China, 4Engineering Physics, Tsinghua University, Beijing, China, 5Key Laboratory of Particle and Radiation Imaging, Ministry of Education, Medical Physics and Engineering Institute, Tsinghua University, Beijing, China

UTE allows imaging of rapidly decaying short-T2 components and are often combined with multi-echo radial acquisition for PET attenuation correction applications. However, UTE is inherently susceptibility to gradient errors due to the usage of radial acquisition and simple time delay corrections render impractical to correct deviations from the ideal trajectory when UTE is combined with multi-echo radial acquisition scheme. In this work, we describe a simple, one-time calibration method that allows k-space trajectory correction for UTE sequence combined with multi-echo radial acquisition. The performance of the proposed method is shown via a phantom and an in vivo experiment, using a calibration scan previously acquired from a water phantom.

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