Abstract #2020

Validation of respiratory correlated 4D-MRI for radiotherapy planning, using a motion phantom and comparing to 4D-CT.

Joan Chick¹, Evanthia Kousi¹, Andreas Wetscherek¹, Julie Hughes², Georgina Hopkinson², Jessica Gough^2,3, Rosalyne Westley^2,3, Radhouene Neji⁴, Alex Dunlop¹, Simeon Nill¹, Henry Mandeville^2,3, Katharine Aitken^2,3, Dow-Mu Koh^2,3, and Uwe Oelfke¹

¹Joint Department of Physics, The Institute of Cancer Research and Royal Marsden Hospital, London, United Kingdom, ²Royal Marsden Hospital, London, United Kingdom, ³The Institute of Cancer Research, London, United Kingdom, ⁴MR Research Collaborations, Siemens Healthcare, Frimley, United Kingdom

Synopsis

Keywords: Data Acquisition, Radiotherapy, Respiratory Correlated MRIRespiratory correlated 4D-MRI has the potential to be a valuable tool in radiotherapy. This work aims to optimise and validate a 4D-MRI golden angle stack of stars radial sequence for measuring respiratory motion of abdominal organs. A 4D motion phantom is used to compare 4D-MRI against 4D-CT. For craniocaudal movement, motion is underestimated in 4D-MRI but motion estimation improves for non-axial acquisitions. This could be due to the alignment of the motion direction with the cartesian phase encoding direction for axial stack of stars acquisitions.

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