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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