TomoTherapy to Host Analyst and Investor Meeting at ASTRO 2007

Live Webcast on Monday, October 29 at 8 a.m. PT (10 a.m. CT)

MADISON, Wis. – October 18, 2007 - TomoTherapy Incorporated (NASDAQ: TTPY) today announced that it will host an analyst and investor meeting in conjunction with the American Society for Therapeutic Radiology and Oncology’s (ASTRO) 49th Annual Meeting in Los Angeles on Monday, October 29 from 8-10 a.m. PT.

A live Webcast of the presentation will be available from the Investor Relations portion of TomoTherapy.com. For those who are unable to listen at the time of the presentation, an archive of the Webcast will be available on the company’s site for 30 days following the presentation.

About TomoTherapy Incorporated

TomoTherapy Incorporated has developed, manufactures and sells the TomoTherapy® Hi·Art® treatment system, an advanced radiation therapy system for the treatment of a wide variety of cancers. The Hi·Art treatment system combines integrated CT imaging with conformal radiation therapy to deliver sophisticated radiation treatments with speed and precision while reducing radiation exposure to surrounding healthy tissue. The company completed its initial public offering in May 2007 and its stock is traded on the NASDAQ Global Market under the symbol TTPY.

18 Oct 2007