ESTRO 2024 - Abstract Book

S5498

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

ESTRO 2024

surface. ‘Move couch’ was applied to move the patient to the isocenter position in 6 degrees of freedom automatically at the control console. CBCT was taken daily, and all the shifts were recorded.

Results:

134 CBCT images were analyzed in each method. The average positioning errors and standard deviation for Method A and B were (0.22±0.15)cm, (0.34±0.26)cm, (0.39±0.29)cm, (0.55±0.51)°, (1.0±0.76)° ， (0.99±0.87)° and (0.16±0.13)cm, (0.20±0.16)cm, (0.12±0.19)cm, (0.36±0.38)°, (0.31±0.42)°, (0.43±0.42)° in vertical, longitudinal, lateral, rotation, pitch and roll directions. The result has shown statistically significant different (p<0.05) between Method A and Method B in all directions.

Conclusion:

SGRT positioning method is proven to be superior to existing arch-ruler positioning method. It eliminates the calculation process prior to positioning and increases the efficiency of the positioning process itself. In addition, it also improves the accuracy and reproducibility of positioning.

Keywords: SGRT, positioning accuracy, reproducibility

References:

1. Heinzerling J H , Hampton C J , Robinson M , et al. Use of surface ‐ guided radiation therapy in combination with IGRT for setup and intrafraction motion monitoring during stereotactic body radiation therapy treatments of the lung and abdomen[J]. Journal of Applied Clinical Medical Physics, 2020, 21(5).

2. Hoisak JDP, Paxton AB, Waghorn B, Pawlicki T. Surface Guided Radiation Therapy. Boca Raton, FL: CRC Press (2020).