Fig. 3

The variances in the intrafractional movement per time segment. The horizontal axis shows the time at 2, 4, 6, 8 and 10 min after the initial setup and the final point is the end of session. The vertical axis represents the variance of the intrafractional bladder wall movement. The variances in the cranial vs. caudal, left vs. right, and anterior vs. posterior tumor groups in the CC, LR, and AP directions are shown together