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Abstract #2173

A navigated bSSFP sequence for volumetric liver respiratory motion measurement

Chuan Huang 1 , Yoann Petibon 1 , Timothy G Reese 2 , Jinsong Ouyang 1 , and Georges El Fakhri 1

1 Center for Advanced Medical Imaging Sciences, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States, 2 Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA, United States

The respiratory motion of the liver is desired in many clinical applications including respiratory motion compensated image acquisition/reconstruction and image-guided interventions in the liver. Recent advancement in simultaneous MR-PET acquisition enables the possibility to accurately perform MR-assisted liver PET respiratory motion correction using liver motion measured by MR. So far, T1-weighted MRI and tagged MRI have been investigated in the MR-assisted liver motion correction. However, neither T1w MRI nor tagged MRI is optimal for liver respiratory motion measurement in human due to lack of contrast in T1w images in the liver and fading away of tags (T1 of liver is approximately 700ms while respiration cycle is about 5s). In this work, we propose a strategy to obtain the volumetric liver motion field using a navigated slice-by-slice balanced steady-state free precession (Nav-bSSFP) sequence.

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