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Abstract #3831

Motion-Adaptive Temporal Resolution for Radial Real-Time Imaging at a Low-Field MR-Linac

Florian Friedrich1,2, Philipp Mann3,4, C. Katharina Spindeldreier5, Peter Bachert1,2, Mark E. Ladd1, Sebastian Kl├╝ter5, and Benjamin R. Knowles1

1Medical Physics in Radiology, German Cancer Research Center (DKFZ), Heidelberg, Germany, 2Department of Physics and Astronomy, Heidelberg University, Heidelberg, Germany, 3Department of Medical Physics in Radiation Oncology, German Cancer Research Center (DKFZ), Heidelberg, Germany, 4National Center for Radiation Research in Oncology (NCRO), Heidelberg Institute for Radiation Oncology (HIRO), Heidelberg, Germany, 5Department of Radiation Oncology, University Hospital of Heidelberg, Heidelberg, Germany

Hybrid MRI linear accelerators (MR-linacs) enable real-time image guidance during radiotherapy. Under real-time MRI, a compromise must be found between spatio-temporal resolution and SNR, whereas to precisely track tumour position, both should be maximised. The presented method implements a motion-adaptive image reconstruction based on a golden-angle radial acquisition scheme. This allows producing SNR-optimised images under periods of small motion and images optimised for temporal resolution when motion is larger. The technique was implemented at a low-field MR-linac (0.35T) to image a free-breathing volunteer and a motion phantom.

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