A Deep Learning-based correction to EPID dosimetry for attenuation and scatter in the Unity MR-Linac system

•EPID dosimetry for the Unity MR-Linac is accurate only for the central region of the EPID.•Dosimetric verification is only possible for field sizes up to ~10 × 22 cm2 at isocentre.•A Deep Learning (DEEPID) method accounts for the attenuation and scatter outside the central region.•DEEPID allows for accurate dose reconstruction using the entire EPID image.•DEEPID enables dosimetric verification for field sizes up to ~19 × 22 cm2 at isocentre.