ESTRO 2024 - Abstract Book

S5546

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

ESTRO 2024

The average online table correction (± SD) for Group A and B2 combined in LR, AP and CC direction was 6.44 mm (± 5.40 mm), 2.63 mm (± 2.04 mm) and 3.03 mm (±1.96 mm), respectively. For 5 out of 21 (24%) fractions, the online table correction exceeded the 8 mm CTV-PTV margin.

Conclusion:

The introduction of IGRT combined with the AP/PA technique and an increased SSD, enables correction of all translations with an online table correction. Additionally, rotations can be detected and repositioning can be performed if the target is outside the PTV due to rotations. As a result of the IGRT implementation, irradiation is performed more accurately. This led to only 3 out of 21 fractions having a part of the target move outside the PTV, as opposed to 10 out of 21 fractions without the use of IGRT.

Keywords: Online, CBCT

1642

Digital Poster

Evaluation of 3D printed bolus using Adaptiiv 3D software for tumours in the head and neck region.

David Marsh 1 , Kristina Quingua 1 , Maria Boutros 2 , Jessica Woodward 2 , Anna Thompson 3 , Gordon Sands 4 , Shabnam Petkar 1 , Turmi Patel 1 , Sabina Khan 1 , Syed Moinuddin 1 , Rita Simoes 1 1 University College London Hospital NHS Foundation Trust, Radiotherapy, London, United Kingdom. 2 University College London Hospital NHS Foundation Trust, Radiotherapy Physics, London, United Kingdom. 3 University College London Hospital NHS Foundation Trust, Clinical Oncology, London, United Kingdom. 4 Leo Cancer Care, Research Department, Horley, United Kingdom

Purpose/Objective: