ESTRO meets Asia 2024 - Abstract Book

S381

RTT – Service evaluation, quality assurance and risk management

ESTRO meets Asia 2024

Keywords: Quality of Life during Radiotherapy

References:

The Role Of Effective Radiation Therapist–Patient Communication In Alleviating Treatment-Related Pain And

Procedural Discomfort During Radiotherapy Katia Mattarozzi, 1 Edita Fino, 1 Valeria Panni, 1 Alessandro Agostini, 1

Alessio G Morganti, 1 and Paolo Maria Russo 1

Qualitative evaluation of the role of RTTs IGRT specialists and their influence on treatment delivery

Author links open overlay panelFilipa Sousa a b , Monica Somoano a , Younes Jourani c , Dirk Van Gestel a

171

Proffered Paper

Selection criteria and method for DIBH in patients with left breast cancer undergoing PORT/IMRT

Yingying Zhou 1 , Jinfeng Xu 1 , Fumin Xu 2 , Bo Chen 1 , Yanning Li 1 , Huali Li 3 , Lisheng Pan 1 , Yang Li 4 , Longmei Cai 1 , Lin Yang 1 , Hongmei Wang 1 1 Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, China. 2 Clinical Research Department, Perception Vision Medical Technology, Guangzhou, China. 3 School of Biomedical Engineering, Southern Medical University, Guangzhou, China. 4 The First school of clinical medicine, Southern Medical University, Guangzhou, China

Purpose/Objective:

Previous studies have explored various metrics to predict heart dose or dose benefit for identifying appropriate patients using DIBH with left breast cancer undergoing postoperative radiotherapy (PORT). However, there are no consistent recommendations or evidence regarding dose thresholds for selection. Therefore, this study aimed to determine if a free-breathing mean heart dose (FB-MHD) more than 400 cGy could serve as a selection threshold and to develop anatomical metrics for predicting FB-MHD, facilitating the quick selection of DIBH candidates.

Material/Methods:

Forty-one patients with post-modified radical mastectomy left breast cancer treated with intensity-modulated radiotherapy (IMRT) were included. Dose-volume histogram parameters of the target area, heart, and lung were analysed and compared between the FB and DIBH plans in 21 patients with DIBH. These patients were then divided into a high-risk group (FB-MHD ≥ 400 cGy) and a low-risk group (FB-MHD < 400 cGy) to compare differences in heart dose, risk of long-term cardiac death after radiotherapy, and DIBH benefit. Heart dosimetric parameters were collected from an additional 20 patients treated with FB, and a measurement model was constructed to measure anatomical metrics based on localization CT images, including cardiac-to-chest Euclidean distance (CCED), cardiac-to-chest gap (CCG), and cardiac-to-chest combination (CCC). Roc curves were used to assess the discriminative power of these metrics for FB-MHD more than 400 cGy.

Results: