Zdenko van Kesteren1, Daniël Tekelenburg1,2, Oliver Gurney-Champion1,3, Aart Nederveen3, Eelco Lens1, Astrid van der Horst1, Aleksandra Biegun2, and Arjan Bel1
1radiotherapy, Academic Medical Centre, Amsterdam, Netherlands, 2KVI-Center for Advanced Radiation Technology, University of Groningen, Groningen, Netherlands, 3radiology, Academic Medical Centre, Amsterdam, Netherlands
We developed a respiratory-correlated 4DMRI for
abdominal imaging by retrospective sorting 2D T2-weighted TSE images. Each
image is assigned to a respiratory state, which is either binned in phase or the
amplitude domain. The diaphragm motion per image was determined by registering
the diaphragm to the begin-inhale image of a series. Per slice and per bin
multiple images were acquired and we defined the intra-bin variation as the
standard deviation of diaphragm positions. Amplitude binning results in lower
intra-bin variation with respect to phase binning, 0.8 versus 2.4 mm
respectively.
