Abstract #2215

Multi-parametric MRI on a 0.35 T MR-LINAC: application to prostate radiotherapy treatment follow-up

Louis Marage¹, Igor Bessières¹, Magali Quivrin², Aubignac Léone¹, Karine Peignaux-Casanovas², Gilles Truc², Paul-Michael Walker¹, and Stanislas Rapacchi³

¹Medical Physics, Centre Georges-François Leclerc, Dijon, France, ²Radiotherapy, Centre Georges-François Leclerc, Dijon, France, ³Aix-Marseille Univ, CNRS, CRMBM, Marseille, France

Synopsis

- The proposed method allows a comprehensive relaxation times estimation (T1, T2, T2*) on MRgRT systems.

- The methodology was validated on phantom and volunteer for accuracy and reproducibility.

- For T1 and T2, less than 5 % coefficient of variation was observed and less than 10 % for the T2*.

- Trends on 5 patients show a slight decrease and a recovery for the T1 and T2 values in both the boost and whole prostate during their treatment.

- The dispersion of T1 and T2 decreased for all patients for the whole prostate whereas it was stable for the boost.

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