Radiotherapy system and operating method

Abstract

The present invention relates to a radiotherapy system comprising a calibration system, the calibration system comprising: at least one first optical detection device mounted at a rack; at least one second optical detection device fixed in the peripheral area of an examination table and / or the rack; a set of first fiducial markers selectively attachable to a defined position on the examination table and detectable by a first optical detection device; and a phantom selectively attachable to a defined position on the examination table and including a set of second fiducial markers detectable bythe second optical detection device and a set of third fiducial markers detectable by a radiation imaging device. The system also includes a control device configured to selectively activate the radiation source and rotate the rack, and determine, for one or more rotational positions of the rack, an intersection of a beam axis of the radiation source with the rack axis by linking detection data ofat least the first optical detection device, the second optical detection device, and / or the radiation imaging device.

Description

technical field [0001] The present invention generally relates to real-time image-guided radiation therapy. In particular, the present invention relates to radiation therapy systems and methods of operating radiation therapy systems. Background technique [0002] Medical imaging is often used to aid in the diagnosis and / or treatment of patients. X-ray imaging is an example of a medical imaging technique commonly performed during the diagnosis and / or treatment of tumors. Treatment of tumors can be performed by using ionizing radiation, which is provided by a linear accelerator (LINAC) that generates a radiation beam of electrons and / or protons with specific energies. In such a radiation therapy system, the radiation beam should be aimed as precisely as possible on the target volume or target tissue, ie the tumor, while adjacent healthy tissue should be irradiated as little as possible. [0003] Typically, the radiation beam may be emitted by a radiation source configured t...

AI Technical Summary

Problems solved by technology

Thus, when the radiation source is moved as described above, at least deformation of the radiation source may occur

Although this deformation should be minimal, it may shift the isocenter and negatively affect the outcome of the treatment

However, even without such deformations, the isocenter may be different for different photon energies

In the case of a shifted isocenter, the real path of the radiation beam emanating from the radiation source may deviate from its ideal path such that the target volume may not be hit as precisely as intended

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