Figure 5From: Analysis of motion of the rectum during preoperative intensity modulated radiation therapy for rectal cancer using cone-beam computed tomography The correlation between the percentage of change of bladder volumes (horizontal axis) and motion of rectal centroid (vertical axis). The percentage of change of bladder volumes was calculated as {(bladder volume in CBCT) – (bladder volume in planning CT)} / (bladder volume in planning CT) × 100 (%).Back to article page