PRIMARY OBJECTIVE:
To determine the proportion of patients where the use of CPAP results in a superior radiation plan compared to standard planning procedures in each patient cohort
SECONDARY OBJECTIVES
To determine:
* Impact of CPAP on treatment delivery time;
* Impact of CPAP on total lung volume;
* CPAP compliance;
* Patient experience;
Breast-specific:
• Comparison of organ at risk (OAR) dose constraints between CPAP and deep DIBH)
SABR-specific:
* Internal target volume (ITV) reduction;
* OAR dose constraints between CPAP and standard planning procedures.
Breast cancer patients will undergo normal free breathing and DIBH radiotherapy planning scans. An additional scan with CPAP will be done for the purpose of the study. Radiotherapy plans will be produced on both the DIBH and CPAP planning scans. The planning scan with the best dosimetry will be chosen for treatment. If CPAP has a better radiation plan, then the patient will have CPAP administered during their daily RT. The DIBH plans for each patient, will serve as controls SABR patients will undergo the standard 4-D or breath hold CT and then CPAP CT for the purpose of the study. Respiratory movements will be monitored by Varian RPM system. Radiotherapy plans will be produced from the standard CT and the CPAP CT for comparison.
Patients will be treated on the best plan The trial aim to recruit 70 patients with invasive carcinoma of the breast undergoing adjuvant radiotherapy that includes breast/chest-wall plus regional lymph nodes, and a convenient sample size of those undergoing SABR to lung or liver
