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Table 1 Machine specific parameters for both linacs and the TPSs parameters used for this study

From: Dosimetric comparison of MR-linac-based IMRT and conventional VMAT treatment plans for prostate cancer

Device specific parameters Standard linac Low-field MR-linac
SAD (cm) 100 90
Linac calibration At the maximum dose point: 100 MU correspond to 1 Gy
Effective leaf width (mm) 0.5 0.415
Field size at isocentre (cm2) 40 × 40 27.4 × 24.1
Multileaf collimator Rounded leaf edges double-stacked, double-focused leaves
IMRT technique VMAT ssIMRT
Photon energy (MV) 6 6
Flattening filter FF FFF
Static magnetic field (T) 0.35
TPS parameters:
Calculation grid size (cm3) 0.3 × 0.3 × 0.3 0.3 × 0.3 × 0.3
Statistical uncertainty (%) 1 1
Dose calculation algorithm XVMC KMC