Innovative study tool for safe and effective CT Colon screening.

1. Cylindrical colon units with targets that represent polyps can be set at the position of ascending colon, descending colon and rectum in the life-size lower torso phantom.
2. Four types of colon units are included for evaluation. Each unit has six targets lining in sequence on the inner wall of the unit.
3. Contrast agent can be poured into the colon units for tagging.