Pergeseran Verifikasi Geometri Kasus Kanker Payudara Teknik 3D-CRT menggunakan On Board Imager (OBI)

Abstract

Background: this research is one of the efforts to ensure the accuracy of the irradiation field in breast cancer cases with 3D-CRT technique by verifying the geometry using On Board Imager (OBI), therefore the dose received is exactly right on the target during the treatment and can reduce the impact that will be caused. Methods: The type of this research is used qualitative research method, the study was undertaken starting from January up to May 2023 at a radiotherapy installation of one of Jakarta regional hospitals.  As for the samples taken were 40 breast cancer patients, using primary data in the form of observation and interviews and secondary data is in the form of the patient’s data who had already completed the treatment.. Results: this research showed that there is a shift in the irradiation field that exceeds the tolerance limit at X, Y and Z coordinates, and this verification in 3-DCRT technique is accordingly carried out at multiples of 10 for each irradiation, which is precisely executed at the fractions of 1, 10 and 21. Conclusions: showed that there is an excessive shift in the geometry verification carried out on the related samples to exceed the established tolerance limits (> 0.5 cm). This occurs due to several random errors such as the loss of markers in the patient's body or systematic errors due to mismatches between procedures during radiation planning and when radiation irradiation is carried out.