ESTRO 2024 - Abstract Book

S5491

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

ESTRO 2024

Results:

▪ AlignRT setup for extremity patients is more precise (x,y,z shifts < 3mm in almost 80% ) than conventional setup but similar with the Group B. ▪ In 90% of cases (27 patients in total) weekly CBCT (shifts < 5mm) is possible with AlignRT as opposed to traditional setup (only 3 patients), unless immobilised with thermoplastic mask. ▪ AlignRT setup times (6±1 min) are similar to group B (7±2 min) but superior to group C (5±1min) ▪ The systematic translational errors were comparable for three groups (~2mm) except in the longitudinal direction (2mm vs 3-5mm) with a mean deviation of the population typically below 1 mm Reductions in the magnitude of the random translational errors were seen in the vertical, longitudinal, and lateral directions ( ≤2mm vs 3-4mm) ▪ AlignRT improved treatment efficiency which could be possibly attributed to reduction of repeat imaging and elimination of repositioning.

Conclusion:

SGRT improved the accuracy and reproducibility of patient setup and treatment efficiency of extremity radiotherapy and reduced the frequency of routine IGRT. Monitoring extremity patients during treatment was also useful.

Keywords: SGRT, EXTREMITIES, PRECISION

References:

-“Feasibility of surface guided radiotherapy for patient positioning in breast radiotherapy versus conventional tattoo based setups- a systematic review”. W. Naidoo, M. Leech. Technical Innovations & Patient Support in Radiation Oncology 22 (2022), 39-49

-“Reproducibility of patient setup by surface image registration system in conformal radiotherapy of prostate cancer”. M. Krengli , S. Gaiano, E. Mones, A. Ballarè, D. Beldì, C. Bolchini and G. Loi. Radiation Oncology 4 (2009), 4-9

-“Detection of setup uncertainties with 3D surface registration system for conformal radiotherapy of breast cancer”. L. Deantonio, L. Masini , G. Loi, G. Gambaro , C. Bolchini, M. Krengli. Reports of Practical Oncology & Radiotherapy 16 (3) (2011) 77-81