Background and rationale {6a}
breast cancer
DISEASE, BREAST CANCER
Radiotherapy is recommended for 87% of all diagnosed breast cancer patients for disease control [Standardly the patients are guided to the breath hold level with audio prompts from the operating radiation therapists. However, Cervino et al. [Several systems are currently commercially available to assist the implementation of DIBH in the clinic. These systems include the real-time position management (RPM) system and real-time gating for scanners (RGSC) system (Varian Medical Systems, Palo Alto, CA), the active breathing coordinator (ABC) (Elekta, Stockholm, Sweden), AlignRT (Vision RT Inc., London, UK), Catalyst HD (C-RAD, Uppsala, Sweden), Exac-Trac (Brainlab, Feldkirchen, Germany), and Identify (Varian Medical Systems, Palo Alto, CA).RPM and RGSC utilise an infrared camera tracking a marker block, standardly placed on the abdomen between the xiphoid process and the umbilicus. ABC uses a spirometer with a valve that is closed for the breath hold. AlignRT, Catalyst HD, Exac-Trac and Identify use 3D surface imaging, requiring in-room installation and/or do not standardly include a visual feedback feature.Breathe Well (Fig. The Breathe Well device. RPM and RGSC (Fig. The RPM and RGSC systems. The primary aim of this study is to test the accuracy and usability of Breathe Well to assist DIBH during breast cancer radiotherapy.