The present invention relates to a method for controlling a medical apparatus (100). The method comprises receiving a treatment plan (168) specifying a target volume (146) within an imaging volume (138) and a dose rate of radiation emitted by a radiotherapy apparatus (102) of the medical apparatus (100), and repeatedly acquiring the motion tracking magnetic resonance data and the image magnetic resonance data by controlling a magnetic resonance data magnetic resonance module (106) of the medical apparatus (100) with an interleaved pulse sequence controlling the radiotherapy apparatus (102) to radiate the target volume (146) in accordance with the treatment plan (168) calculating a dose distribution map descriptive of a radiation dose received by the subject (144) from the radiotherapy apparatus (102) using the motion tracking magnetic resonance data, and the treatment plan (168) reconstructing a diagnostic image using the image magnetic resonance data displaying on a display the diagnostic image and the dose distribution map receiving treatment plan update data from a user interface and updating the treatment plan (168) in accordance with the treatment plan update data.
