OC-0940 Assessment of cardiorespiratory motion for cardiac radioablation using a digital 17-segment model

摘要: Materials and MethodsFour specialist therapeutic radiographers reviewed 40 CBCTs from the first 10 patients treated in the UK. The 4 radiographers all had cardiac anatomy training from a radiologist and had experience in delivering cardiac SABR treatment. Anonymised images were imported into a Varian training system from 3 UK centres using CBCTs from both Elekta and Varian linacs. A series of image matches were conducted by each radiographer: a manual match (manual), an automatic match to the heart structure (auto) and the auto match followed by manual adjustment to the PTV (PTV), all using three degrees of freedom (DoF) only. The auto and PTV matches were also repeated using 6 DoF. Inter-observer variability was quantified using 95% limits of agreement from a modified Bland-Altman analysis.