| Accuray CyberKnife(R) Customer Achieves Top Score in Multiple Brain      Metastases TROG 2018 Treatment Plan Study [url=]ARAY[/url] 
 - Results Demonstrate Exceptional Treatment Plan Quality Achievable with      Accuray Treatment Planning Software (TPS)
 
 SUNNYVALE, Calif., May      22, 2018 /PRNewswire/ -- Accuray Incorporated (NASDAQ: ARAY) announced      today that Daniela Schmitt, PhD, a medical physicist at Heidelberg      University Hospital, took top honors in the overall category of the 2018      TROG Plan Study: Stereotactic Radiosurgery (SRS) Brain, with a plan she      created using the Accuray Precision(R) Treatment Planning System. Dr.      Schmitt developed a plan for delivery on the CyberKnife(R) M6(TM) System,      a device designed from the ground up to deliver SRS treatments with      precision and accuracy, and without an invasive frame. The study, hosted      by TROG Cancer Research and ProKnow, received 160 entries from clinicians      around the world. Of these submissions, only 10 percent were plans      produced by the proprietary Accuray Precision System or the MultiPlan(R)      TPS for the CyberKnife platform, while the remaining 90 percent were      created using treatment planning software for other delivery systems,      making a win by a physicist using Accuray TPS even more impressive.
 
 The      goal of the study was to quantify the capabilities of different planners      and delivery modalities to create high quality treatment plans for a      challenging SRS case with five small brain metastases. The plans were      scored based on target coverage and organ-at-risk (OAR) sparing, defined      by specific metrics. Evaluation of the plans was objective and transparent      with real-time scoring and analysis. For more information on the plan      study, register at ProKnow by visiting      proknowsystems.com.
 
 "It      was a great experience to compete with all available systems for SRS      treatments," said Daniela Schmitt, PhD, department of radiation oncology,      Heidelberg University Hospital. "We often use the CyberKnife to treat      patients with multiple brain metastases and now have confirmation of our      good clinical practice. Treatment planning studies like this can help the      whole community to find the best solution with their systems and to      achieve the best daily clinical treatment plans based on the lessons      learned."
 
 The Accuray Precision System is a powerful,      full-featured treatment planning system, enabling clinicians to      efficiently generate high quality radiation therapy treatment plans for      all SRS and stereotactic body radiation therapy (SBRT) cases delivered by      the CyberKnife System.
 
 -- Treatment planning is faster and easier      to perform, without sacrificing the precision and accuracy in radiation      dose delivery that clinicians have come to expect with the CyberKnife      System -- Simplified workflows, automated contouring and plan automation      tools support highly efficient plan generation for even the most complex      clinical cases -- Defining the target and OAR correctly can be achieved      easily due to multimodality images and powerful and automated contouring      tools
 
 "We congratulate Dr. Schmitt on the creation of an      outstanding plan. Her achievement demonstrates what is possible when      clinical skills are partnered with innovative technology," said Lionel      Hadjadjeba, M.D., Senior Vice President, and Chief Commercial Officer at      Accuray. "The Accuray Precision System represents an important step      forward in our treatment planning capabilities. When combined with the      CyberKnife M6 System the resulting precision, versatility and efficiency      make these technologies an ideal choice for the management of multiple      brain metastases, an indication increasingly being treated with SRS."
 
 The      CyberKnife(R) System is routinely used to treat conditions in the brain,      including, but not limited to, benign and malignant primary tumors, brain      metastases, trigeminal neuralgia, acoustic neuromas and arteriovenous      malformations (AVMs). The system enables the clinical team to achieve      maximal sparing of brain tissues involved in important functions such as      hearing and vision.
 
 About Accuray
 
 Accuray Incorporated      (Nasdaq: ARAY) is a radiation oncology company that develops, manufactures      and sells precise, innovative treatment solutions that set the standard of      care with the aim of helping patients live longer, better lives. The      company's leading-edge technologies deliver the full range of radiation      therapy and radiosurgery treatments. For more information, please visit      www.accuray.com or follow us on Facebook, LinkedIn, Twitter and YouTube.
 
 Safe      Harbor Statement
 
 Statements made in this press release that are not      statements of historical fact are forward-looking statements and are      subject to the "safe harbor" provisions of the Private Securities      Litigation Reform Act of 1995. Forward-looking statements in this press      release relate, but are not limited, to clinical applications, clinical      results, and patient experiences and outcomes. These forward-looking      statements involve risks and uncertainties. If any of these risks or      uncertainties materialize, or if any of the company's assumptions prove      incorrect, actual results could differ materially from the results      expressed or implied by these forward-looking statements. These risks and      uncertainties include, but are not limited to, the company's ability to      achieve widespread market acceptance of its products, the company's      ability to manage its growth, and ability to maintain or increase its      gross margins on product sales and services and such other risks      identified under the heading "Risk Factors" in the company's annual report      on Form 10-K, filed with the Securities and Exchange Commission (the      "SEC") on August 25, 2017, the company's quarterly report on Form 10-Q,      filed with the SEC on May 2, 2018 and as updated periodically with the      company's other filings with the SEC.
 
 Forward-looking statements      speak only as of the date the statements are made and are based on      information available to Accuray at the time those statements are made      and/or management's good faith belief as of that time with respect to      future events. The company assumes no obligation to update forward-looking      statements to reflect actual performance or results, changes in      assumptions or changes in other factors affecting forward-looking      information, except to the extent required by applicable securities laws.      Accordingly, investors should not put undue reliance on any      forward-looking statements.
 
 Media Contacts      ---------------------------------- Beth Kaplan Jayme Maniatis Public      Relations Director, Accuray MSLGROUP +1 (408) 789-4426 +1 (781) 684-0770      bkaplan@accuray.com accuray@mslgroup.com
 
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