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Abstract #4165

A Phantom for Evaluation of Motion Quantification Methods in MR-Guided Radiotherapy

Lukas Leiner1, Gernot Echner2, Matthias Borutta2, Reiner Umathum1, Arthur W. Magill1, Steffen Seeber1, Sebastian Flassbeck1, Florian Friedrich1, Anna Fischer1, Nicolas G. R. Behl1, Mark E. Ladd1, and Florian Maier1

1Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, 2Medical Physics in Radiation Oncology, German Cancer Research Center (DKFZ), Heidelberg, Germany

MR-guided radiotherapy enables real-time tracking of targets during therapy application, with the aim of improving targeting accuracy and, hence, treatment efficiency. To evaluate MR-based motion quantification techniques, a phantom that can generate reproducible, known motion is an extremely valuable tool. A modular motion phantom was designed and implemented that provides precise and reproducible linear motion, including accurate position information. The phantom was found to be MR-compatible. An initial evaluation of real-time bSSFP imaging was performed. The developed device can be used as research tool for MR-guided therapy and as a clinical quality assessment tool to improve treatment of patients.

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