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OBJECTIVE: The aim: This study aimed to define the factors related to irradiation field equality and target accuracy which will further influence the irradiation result. PATIENTS AND METHODS: Materials and methods: This is a prospective-qualitative study, conducted by observation of image data verification from cervical cancer patients in the Department of Radiotherapy, dr. Moewardi Hospital, Surakarta who had undergone several times a week irradiation utilizing Telecobalt60 device and by conducting an in-depth interview to ten Indonesian radiotherapy experts, in October 2018. The data was further analyzed using correlation - regression test. RESULTS: Results: From 30 verification image data of the irradiated patients, we conclude that the scheme, body size, and patient positioning factors have all revealed statistically significant correlations to the irradiation field equality. On the other hand, factors such as patient and tele-therapy device set-ups, tele-therapy device calibration, human resources quality, and tele-therapy device malfunctions have all revealed statistically significant correlations to the irradiation target accuracy. These facts were further strengthen by the supporting statements from 10 Indonesian radiotherapy experts. CONCLUSION: Conclusions: The impact factors of field equality and accuracy of the irradiation target could serve as an important control factors which is substantially required to manage and minimize site errors of the radiotherapy delivery.

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OBJECTIVE: The aim: This research aimed to show the achievement of Telecobalt60 radiation certainty using computed radiography, in comparation with non-verified computed radiography. PATIENTS AND METHODS: Materials and methods: This research is a quantitative study, randomized double-blind, and consecutive sampling design. The study was conducted by observing and com¬paring the data of verified computed radiography (VerC) computed radiograph for Telecobalt60 compared to the non-verified computed radiography (nVerC) Telecobalt60 data. RESULTS: Results: The results showed that there are significant statistical differences in several measurement characteristics between the verified computed radiography arm and the non-verified computed radiography arm. All of the value divergences of the verified computed radiography arm are less than 7 mm while the non-verified computed radiography arm are 7 mm or more (P<0.050). Furthermore, all of the edge aspect of measurement in the verified computed radiography arms are less than the non-verified computed radiography, all without manual block utilization (P<0.050). CONCLUSION: Conclusions: We conclude that Telecobalt60 radiation certainty is significantly better achieved by using computed radiography, when compared to non-verified computed radiography Telecobalt60 use. This research contributes to provide evidence based for better Telecobalt60 radiation accuracy and quality of radiotherapy outcome by using computed radiography.