Fig. 2

Intrafraction prostate displacement with EIS. Inverse Cumulative histogram of the 3D displacement, and left-right (L/R), superior-inferior (S/I), and anterior-posterior (A/P) axis displacements. Less than 1 % of 3D displacements were greater than 2.9 mm, and no displacements were ≥ 3.0 mm. Similarly, no translational displacements were ≥ 2.0 mm in the L/R and A/P axes, and none were ≥ 2.3 mm in the S/I axis