Abstract #2691

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

Liao Ying¹, Paul Kyu Han², Shuang Hu^2,3, Kui Ying^4,5, 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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