Styrofoam Fixation in Breast Cancer Radiotherapy

According to the fixation mode (due to the introduction of Styrofoam postural fixation of breast cancer in routine practice in 2022, the previous fixation was terminated), the selected patients were divided into two groups, including the breast bracket and Styrofoam glue groups. The production process of Styrofoam is shown in Figure 1. In both groups, the mandible of the participants was raised as much as possible, their heads were inclined to the healthy side by 15 degrees, and their arms were raised naturally. The 16-slice large-aperture spiral Computer Tomography (CT) was used to simulate localization in the two groups. The scanning range was 5 cm from submandibular to subdiaphragmatic with a slice thickness and interval of 5 mm. The scanned images were sent to the doctor’s workstation system, and the radiotherapist delineated the target area in the CT positioning image combined with other image data based on the RTOG standard, limited the surrounding organs at risk, and formulated a target dose. The CTV was enlarged to 5 mm to form a PTV. The sketched images were sent to the radiotherapy treatment planning system (TPS), and the radiotherapy plan was prepared by the radiotherapy physicist. The radiotherapy plan was transferred to the accelerator after verification.