ESTRO 2025 - Abstract Book

S4106

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

ESTRO 2025

multi-institutional approach. The introduction of any MM technique increases the complexity of radiotherapy. The impact of this on patients and their ability to tolerate SABR must also be considered.

Material/Methods: A comprehensive literature search was conducted using Google Scholar, Cochrane Library, PubMed, SHU Library, CINAHL, Medline. Only English-language studies published in the last 20 years were included. Grey literature was included as it provided insights into the patient experience. Studies relating to abdominal radiotherapy but not specifically SABR prescriptions were excluded. The review did not differentiate between manufacturer-specific technology of the same MM technique Results: A total of 12 articles met the inclusion criteria. Most studies focused on abdominal compression (AC) as an MM technique. The data search did not identify any randomised controlled trials, likely due to the challenges in blinding participants to the exposure. The MM techniques discussed within the review did have an impact on organ motion, deformation, and patient comfort. Eccles et al., (2011) reported AC reduced tumour motion in 90% of 60 liver SABR patients compared to free breathing. These results are supported by studies by Lovelock et al., (2014) who saw a reduction in liver motion although less pronounced. Hu et al., (2016) identified the effectiveness of AC can be influenced by device positioning. Despite this relationship only 1 of 5 studies in this review provided details about device positioning and their rationale. The aim of this review was to collate single centre studies to create a cohesive approach to MM, but the findings suggest that the optimal technique must be determined on a departmental basis. Conclusion: The results demonstrate that AC provides the least organ motion and displacement but there are clinical challenges in its implementation and in the patient experience. No singular technique is universally optimal for all clinical situations or patients, but this review can inform departmental protocols, guiding the selection of MM methods for liver SABR. References: Eccles, C. et al. (2011). Comparison of Liver Tumour Motion With and Without Abdominal Compression Using Cine Magnetic Resonance Imaging. Int. Journal of Rad. Onc. Biology Physics. 79(1). 602-608. Hu, Y. et al. (2016). 4D-CT scans reveal reduced magnitude of respiratory liver motion achieved by different abdominal compression plate positions in patients with intrahepatic tumours undergoing helical TomoTherapy. Med. Phys. 43(7). 4335. Lovelock, D. et al. (2014). The Effectiveness of a Pneumatic Compression Belt in Respiratory Motion of Abdominal Tumours in Patients Undergoing Stereotactic Body Radiotherapy. Tech. in Cancer Res. & Treatment. 13(3). 195-287. Keywords: Liver, Motion, Management

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Digital Poster Daily Image-Guided Radiotherapy: Optimizing CTV Coverage and Dosimetry in Cervical Cancer Chemoradiation Bhargav Shreeram Gundapuneedi, Ambedkar Yadala, Flavia Lyn Jashan, Ramkumar R, Muniyappan K, Chaitanya Satyan, Parameswari R, Shyama S Prem Radiation Oncology, Jawaharlal Institute of Postgraduate Medical Education and Research, Puducherry, India Purpose/Objective: The internal target volume (ITV) margin is critical in cervical cancer chemoradiation, as highlighted by the EMBRACE studies. It ensures comprehensive clinical target volume (CTV) coverage, minimizing geographical misses from