The object of the present invention is to address the above-mentioned problems related to image quality and patient placement. The purpose is a mock-up antenna configured to be used during radiotherapy delivery, wherein the radiotherapy is performed based on a radiotherapy plan, and the radiotherapy plan is at least partially in the planning magnetic resonance image. Based on the mock-up antenna. The mock-up antenna is substantially transparent to radiation and comprises connection means configured to allow connection between the mock-up antenna and the securing means, the securing means being mocked up during radiation therapy. It is configured to fix the position of the antenna. The mock-up antenna further comprises an inner surface configured to be positioned toward the patient in a manner that affects the position and / or orientation of the patient undergoing radiation therapy, the inner surface of the planning magnetic resonance image. It has a shape that is substantially similar to the shape of the active magnetic resonance imaging antenna used during acquisition.
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