Fig. 3
From: Intra-fraction motion of the prostate is not increased by patient couch shifts
Intra-fraction motion of the prostate (blue plots) was not visibly affected by couch shifts (red plots) during any of the 22 recorded couch movements. In most cases, couch shift amplitudes (red Δ) were several times larger than prostate motion amplitudes (blue Δ). In particular, amplitudes of intra-fraction motion did not increase during couch movements. The correlation coefficient (r) between prostate motion and table shifts was mostly insignificant