CTU-41 is a one piece anthropomorphic torso phantom with anatomical structures that allow various CT approaches including helical scanning. The Kyoto Kagaku Co., LTD original phantom materials with radiation absorption approximate to human tissue allow scanning under actual clinical setting. Along with state-of-the-art synthetic bones, brain with cerebral ventricles, eye balls, lungs with three-dimensional pulmonary vessels, trachea, liver with portal and hepatic veins, kidneys, gallbladder, pancreas, spleen, aorta, cava, ureter, urinary bladder, prostate, rectum, sigmoid colon are embedded. Each individual organ has particular Hounseld number which corresponds that of human body.