Fuji Photo officials said the system is now being used on an experimental basis at some medical institutions.
Small lumps show up on patients with breast cancer.
A lump the size of several millimeters to a little more than 1 centimeter can be detected by hand. The system, however, is not flawless. Officials said it sometimes mistakes shades of a mammary gland for breast cancer. But in Japan, most medical checkups for breast cancer have been carried out through physical examinations.