ESTRO 2024 - Abstract Book

S5481

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

ESTRO 2024

The calculated means of the standard deviation (SD) for translational shifts in tattoo and SGRT setups are 0.47cm and 0.26cm respectively, with 1 degree and 0.96 -degree rotational shifts. Whereas the calculated root mean square of standard deviation (RMS) for translational shifts in tattoo and SGRT set-up are 0.66cm and 0.51cm respectively with 0.95 degree and 0.9 degree rotational shifts. The average time for tattoo and SGRT setups were found to be 17.99 minute and 15.04 minute, respectively.

Conclusion:

SGRT has proven to be superior compared to tattoos in right breast cancer patients since it has comparatively less random and systematic errors in daily clinical scenarios. It also tracks the skin surface with high precision, reducing set-up time and eliminating the requirement for physical tattoos which reflects positively on patients and their comfort. A similar study for left sided breast and chest wall radiotherapy treatments is currently undergoing in our department. It is strongly believe that future data from above mentioned studies will support a complete tattoo-less treatment for breast cancer patients.

Keywords: Set-up Error, Tattoo vs SGRT, Right Breast.

References:

1. Naidoo, Wesley & Leech, Michelle. (2022). Feasibility of surface guided radiotherapy for patient positioning in breast radiotherapy versus conventional tattoo-based setups- a systematic review. Technical Innovations & Patient Support in Radiation Oncology. 22. 39-49. 10.1016/j.tipsro.2022.03.001. 2. Ioana-Claudia Costin, Loredana G. Marcu,Factors impacting on patient setup analysis and error management during breast cancer radiotherapy,Critical Reviews in Oncology/Hematology,Volume 178,2022,103798,ISSN 1040 8428,

441

Digital Poster

SGRT-based stereotactic body radiotherapy for lung cancer setup accuracy and PTV margins

Hailiang Guo 1 , Weiwei Wu 2 , Huaiwen Zhang 3

1 First Affiliated Hospital of Gannan Medical University, Radiation Oncology, Jiangxi, China. 2 Ganzhou Cancer Hospital, Radiation Oncology, Jiangxi, China. 3 Jiangxi Cancer Hospital, Radiation Oncology, Jiangxi, China

Purpose/Objective:

Surface-guided radiation therapy (SGRT) was used to analyze motion during stereotactic body radiotherapy (SBRT) in lung cancer patients and to explore the margin of the planning target volume (PTV).Surface-guided radiation therapy