[MRI-guided radiotherapy: An innovation for patients with upper abdominal malignancies].

MRI-guided radiotherapy is a new technique for high-precision radiation(stereotactic radiotherapy) for patients with malignancies. This minimally invasive treatmentis carried out with the aid of an irradiation device with an integrated MRI scanner, the 'magnetic resonance linear accelerator' (MR-Linac), which is used to image the tumour and surrounding tissue immediately before each radiotherapy treatment. The radiation plan can be adapted on the basis of the latest MRI image as required. MRI-guided radiotherapy can have advantages when treating patients with malignancies in the upper abdomen, such as pancreatic carcinoma or periampullary malignancies. These tumours and the surrounding tissues are often poorly visible on the CT scans used in conventional radiotherapy techniques. Patients with upper-abdominal malignancies can be precisely and effectively treated with MRI-guided radiotherapy and organs that are sensitive to radiation can be spared as much as possible, thus decreasing the risk of side-effects.