ESTRO 2025 - Abstract Book

S4087

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

ESTRO 2025

Conclusion: Overall, this study shows that TV, ERV and IC vary with body position, a finding consistent with literature 2 . The TV data suggests that a smaller lung volume is used to breathe normally for UP than SP potentially leading to reduced tumour motion. All patients were able to maintain a 20s DIBH, the minimal required inspiration breath hold for beam delivery for breast and lung RT. Globally, patients were more comfortable in upright than in supine position and preferred the upright position. However, several patients reported that DIBH was easier in the supine position.

Keywords: respiratory volumes, upright radiotherapy

References: 1. Yang J, Chu D, Dong L, COurt LE. Advantages of simulating thoracic cancer patients in an upright position. Pract Radiat Oncol. Févr 2014;4(1):e53-58. 2. Katz S, Arish N, Rokach A, Zaltzman Y, Marcus EL. The effect of body position on pulmonary function: a systematic review. BMC Pulm Med. 2018 Oct 11;18(1):159

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Poster Discussion Multidisciplinary Integration in Oncology Treatment: Synergy between Radiology and Radiotherapy Departments Fernando M. Costa 1,2,3 , Daniela Saraiva 1 , Filipa Fonseca 1 , João Casalta Lopes 1 , Vítor Silva 4 , Armanda Monteiro 1,2 , Ana Catarina Silva 4 , Lígia Osório 1 1 Radiotherapy, ULS São João, Porto, Portugal. 2 Medical Imaging and Radiotherapy, E2S - P. Porto, Porto, Portugal. 3 Applied Physics, School of Engineering, University of Vigo, Vigo, Spain. 4 Radiology, ULS São João, Porto, Portugal Purpose/Objective: The multidisciplinary impact between MRI and RT has revolutionized cancer treatment, enhancing precision and patient outcomes. MRI provides superior soft tissue contrast in RT where precise and effective high doses are delivered to well-defined target volumes. 1,2 Image fusion between MRI and CT provides better visualization of the target and surrounding tissues. To improve the quality of image co-registration, cooperation between the Radiology (RD) and Radiotherapy (RT) departments in patient positioning was tested, incorporating a thermomoldable cervical cushion in CT and MRI planning. 1,3 The objective of this study was to understand the impact of RD/RT synergy on image fusion planning with the use of thermomoldable cushion, compared with the diagnostic set-up. Material/Methods: Two hundred co-registrations of patients treated at our institute were analysed. The sample was divided equally into two different acquisition configurations: the diagnostic configuration (A) and the RD/RT synergy configuration