TomoTherapy to Announce 2007 Second Quarter Results

Live conference call and webcast at 4:00 pm CDT

MADISON, Wis. – July 11, 2007 – TomoTherapy Incorporated (Nasdaq: TTPY) today announced that it will release its 2007 second quarter results on Wednesday, August 1, 2007, at 3:00 pm CDT.

TomoTherapy also will hold an investment community conference call on Wednesday, August 1, 2007, beginning at 4:00 pm CDT. Dr. Fred Robertson, CEO, and Steve Hathaway, CFO, will review second quarter performance and discuss the company’s strategies. To join the conference call, dial 1-800-659-2032 (international 1-617-614-2712) and enter passcode 71617958. A replay of the conference call will be available one hour after the call ends through 11:59 pm CDT on Friday, August 3, 2007. To access the replay, dial 1-888-286-8010 (international 1-617-801-6888) and enter passcode 73026758.

For individual investors, a live Webcast of the conference call will be available at www.TomoTherapy.com under the “Investor Relations” tab. Institutional investors can access the Webcast through a password-protected site at www.streetevents.com. An archived Webcast of TomoTherapy’s conference call will be available for two weeks.

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.

11 Jul 2007