ESTRO 2024 - Abstract Book

S5473

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

ESTRO 2024

Figure 1 Scatterplots kV-kV couch correction pitch vs residual CBCT CC-setup correction for DSPS- and Brainlab masks

Conclusion:

Brainlab masks exhibit statistically significant greater stability in AP, CC and pitch directions while DSPS masks show a better stability in roll. Brainlab masks showed lower correlation values of residual deviations in CC and LR direction after performing pitch and roll corrections, respectively, compared to DSPS masks. However, the differences lack clinical relevance since >90% of intra-fraction setup errors stayed below 0.09cm. Increased imaging and time consumption may occur if tolerances for verification imaging are set too tight.

Keywords: Stability intracranial masks

References:

1. Shah AP, Meeks DT, Willoughby TR, Ramakrishna N, Warner CJ, Swanick CW, Kelly P, Meeks SL. Intrafraction motion during frameless radiosurgery using Varian HyperArcTM and BrainLab ElementsTM immobilization systems. J Radiosurg SBRT. 2020;7(2):149-156. PMID: 33282468; PMCID: PMC7717095.

2. Tomihara J, Takatsu J, Sugimoto S, Shikama N, Sasai K. Intrafraction stability using full head mask for brain stereotactic radiotherapy. Journal of Applied Clinical Medical Physics 2021. Doi: 10.1002/acm2.13382

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Poster Discussion

The role of SGRT in detecting inter and intra fraction errors in SBRT treatments to the lung

Nicolle Gomes 1,2 , Ana Maria Maximiano 1 , João Costa 1 , Ana Furtado 1 , Nuno Pimentel 1 , Carlo Greco 1

1 Champalimaud Foundation, Radiotherapy, Lisbon, Portugal. 2 Mercurius Health, Radiotherapy, Lisbon, Portugal