Abstract #1252

UTE with Multi-Echo Radial Acquisition for PET/MRI Attenuation Correction

Zhengyang Ming¹, Paul Kyu Han², Debra E. Horng², Shuang Hu^2,3, Kui Ying^1,4, Chao Ma², and Georges El Fakhri²

¹Engineering Physics, 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, ⁴Key Laboratory of Particle and Radiation Imaging, Ministry of Education, Medical Physics and Engineering Institute, Tsinghua University, Beijing, China

Reliable estimation of PET attenuation coefficient (AC) is a fundamental problem in PET/MR imaging. Accurate measurement of bone density variation is vital to generate reliable subject-specific AC maps using MR. Also, minimizing the data acquisition time of MR sequences for AC is essential to allow more MR scans in a single PET/MR scanning session. In this work, we propose a new acquisition scheme combining UTE and multi-echo radial acquisition to reliably estimate the composition of water, fat and bone in a minute scan. Results show that water, fat and bone signals can be estimated in using the proposed method, which can be potentially used to estimate subject-specific AC maps.

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