ESTRO 2024 - Abstract Book

S5522

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

ESTRO 2024

outcomes paves the way towards enhancing clinical management initiatives through patient-centred approach and bridging the gaps in radiation oncology care.

Keywords: DIBH, breath-hold, breast

References:

1. Oonsiri, P., Wisetrinthong, M., Chitnok, M., Saksornchai, K., & Suriyapee, S.. (2019). An effective patient training for deep inspiration breath hold technique of left-sided breast on computed tomography simulation procedure at King Chulalongkorn Memorial Hospital. Radiation Oncology Journal, 37(3), 201–206. https://doi.org/10.3857/roj.2019.00290

1188

Proffered Paper

Tattoo-less SGRT setups for tangential breast radiotherapy with non-daily CBCT- a validation study

Sumie Namba 1 , Jared G Steel 2 , Matthew R Hoffmann 1 , Hannah J Thompson 1 , Abbey J Baylis 1 , Carmen J Hansen 1 , Thomas P Shakespeare 2 1 Mid North Coast Cancer Institute, Radiation Oncology, Port Macquarie, Australia. 2 Mid North Coast Cancer Institute, Radiation Oncology, Coffs Harbour, Australia

Purpose/Objective:

Surface Guided Radiation Therapy (SGRT) is a non-invasive positioning alternative to tattoo alignment for external beam radiotherapy that is rapidly increasing in use globally [1]. Removing the need for tattoos from the radiotherapy process has been shown to improve body image and psychosocial well-being for cancer survivors [2]. As well as improving long term patient care, SGRT brings the benefits of increased accuracy to initial radiotherapy positioning and greater efficiency of treatment sessions [3]. All supine breast patients treated in our department have a tattoo less SGRT setup with daily cone-beam computed tomography (CBCT) image verification if there is a need for soft tissue matching due to simultaneous integrated boosts (SIB) or nodal involvement. However, for breast-only tangential radiotherapy the treatment site correlates well with the skin surface making it ideal for patient positioning with SGRT. This treatment method is also robust to minor geometric discrepancies and soft tissue changes [4]. As such, it is possible that the frequency of verification imaging could be safely reduced for this cohort; minimising dose to surrounding organs at risk and potential associated toxicities. This retrospective simulation study was conducted to assess whether tattoo-less SGRT setups can reproduce the patient position with enough accuracy to be utilised for tangential breast-only radiotherapy with a fraction 1-4 and then weekly (F1-4&W) CBCT imaging protocol.

Material/Methods: