Fig. 2.

Translational shifts for each fraction calculated from pre- and post-CBCT. Vectoral length (r) from the components is calculated and displayed for reference. Difference during fraction 30 was identified with triggered imaging mid-treatment with a CBCT initiated due to the kV data suggesting intrafraction motion. Patient treatment was paused to realign patient before continuing. Red line indicates the 1 mm threshold for clinical intervention. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)