Нестандартное использование встроенных детекторов аппарата TomoTherapy для проведения процедур гарантии качества

Verification of radiation therapy plans on the Tomotherapy device is generally performed by comparing the measured dose distribution in the phantom with the calculated dose from the Tomotherapy planning system. However, the number of points at which measurement is possible is limited, and the time of the verification procedure exceeds the time of the patient's treatment. At the same time, the exit detectors of the machine have the ability to measure the output radiation fluence throughout the entire irradiation time, they have a high spatial resolution, and do not require additional installation efforts. The article develops a method for processing data from the exit detectors of Tomotherapy and for comparing them with data from the planning system. An application has been created in the MATLAB that processes 2 types of data: a radiation therapy plan in DICOM format from the planning system and raw data from the exit detectors. A method for resulting the data to a single view is developed by taking into account correction factors, such as background radiation, the shape of the detector, the influence of neighboring leafs, and the leaf-channel relationship. It is possible to compare two sets of data using a two-dimensional gamma index. The created method will make the verification of radiation therapy plans more informative, accurate and easier, and in the future, it can help evaluate the accuracy of dose delivery and the accuracy of patient positioning during treatment.