First experiences with the implementation of the European standard EN 62304 on medical device software for the quality assurance of a radiotherapy unit

Table 1 Beam parameters used for patient treatment

Parameter	Steps	Ion type
		Protons	Carbon ions
Energy	255	48 – 221 MeV/u	88 – 430 MeV/u
Focus (FWHM)	1 (protons)/4 (carbon ions)	8 – 32 mm	6 – 12 mm
Intensity	9 (protons)/8 (carbon ions)	1·10⁸ – 3·10¹⁰ 1/s	1·10⁷ – 1·10⁸ 1/s
Gantry angle	360°	The gantry angle can be changed with a resolution of 0.01°; 36 steps are used for the interpolation of the settings

ISSN: 1748-717X