Abstract #3831

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

Florian Friedrich^1,2, Philipp Mann^3,4, C. Katharina Spindeldreier⁵, Peter Bachert^1,2, Mark E. Ladd¹, Sebastian Klüter⁵, 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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