Dosimetric feasibility of hypofractionation for SBRT treatment of lymph node oligometastases on the 1.5T MR-linac

Dosimetric feasibility of hypofractionation for SBRT treatment of lymph node oligometastases on the 1.5T MR-linac: Stereotactic body radiation therapy (SBRT) is a non-invasive treatment option which is often considered for focal ablation of oligometastatic disease or primary tumours which are not suitable for surgical resection [1–3]. In SBRT a relatively high irradiation dose is delivered in a limited number of fractions to the target in a highly conformal manner with steep dose gradients to achieve good sparing of the organs at risk (OARs) [4,5]. Many different fractionation schemes are currently being used in clinical practice.