The Tomotherapy Project at the UW Department of Medical Physics designed a new way to treat cancer and to quality assure those treatments. It was the marriage of a CT scanner with radiotherapy. Tens of thousands small beams of radiation were delivered around the patient in a pattern determined by a optimization program. This resulted in much less dose to neighboring sensitive tissue and more uniform dose to the tumor. The radiation could also be used to take a CT scan each treatment to ensure that the patient was set up in the correct position. A company, TomoTherapy Inc. was spun out to develop the technology. The systems were sold throughout the state and have treated thousands of Wisconsin patients and employed 400 citizens.