ESTRO 2024 - Abstract Book

S5508

RTT - Patient care, preparation, immobilisation and IGRT verification protocols

ESTRO 2024

Results:

In current clinical use, 22 of the 63 patients received at least one code orange during their therapy, with 2 of them having a systematic code orange defined, totaling 43 fractions. No patients were interpreted as having a code red. Tumor or lung tissue-related reasons were the most commonly reported causes for code orange as demonstrated in Table 1 . The IGRT specialist assigned code orange or red in 59 patients, 38 of which had systematic ITAC’s. In total, the RTT specialist reported 684 fractions with code orange and 13 with code red. In one-third of all fractions, there were observed lung contour changes due to atelectasis, pleural effusion, or inferior positioning of the thorax. During the implementation phase, similar numbers are observed. In clinic, 4% of the fractions were reported as code orange vs. 36% in the offline review by an IGRT specialist. A time evaluation of image interpretation shows that RTTs spent 2 minutes and 31 seconds online reviewing images. When they assigned a code to the fraction, the interpretation time was longer, on average 4 minutes and 4 seconds. The average interpretation time for code orange fractions assessed by the IGRT specialist was 3 minutes and 3 seconds. 94% of all fractions were interpreted within 5 minutes.