Colorectal cancer ranks first in incidence and second in mortality among all cancers in Japan. However, many deaths can be prevented through early detection. In reality, even when a fecal occult blood test result is positive, many individuals do not undergo follow-up diagnostic examinations due to the physical and psychological burden of conventional procedures. This has contributed to increasing incidence and mortality rates. To address this issue, we are researching and developing a CT-based virtual colonoscopy system as a less invasive and more accessible diagnostic option, and working toward its social implementation.