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Abstract #3614

Optimal MRI sampling and binning for online 4D retrospective respiratory motion analysis of the abdomen

Bjorn Stemkens 1 , Rob H. Tijssen 1 , Baudouin Denis de Senneville 2,3 , Jan J.W. Lagendijk 1 , and Cornelis A.T. van den Berg 1

1 Department of Radiotherapy, UMC Utrecht, Utrecht, Netherlands, 2 Image Science Institute, UMC Utrecht, Utrecht, Netherlands, 3 IMB, UMR 5251 CNRS/University Bordeaux, Bordeaux, France

Patient specific online characterization of abdominal organ motion will open the possibility for adaptive radiotherapy treatment that accounts for day to day variations in tumor motion and motion of surrounding organs. In this abstract we propose an online method, based on retrospective binning of the data with respect to the respiratory cycle, which allows 4D motion characterization in less than 15 minutes. The method utilizes a clinically available pulse sequence, and Matlab based reconstruction and post-processing software.

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