ELEKTA AND IMPAC MEDICAL SYSTEMS AGREE TO JOINTLY DEVELOP DICOM-RT LINEAR ACCELERATOR INTERFACE Interface will be the first complete linear accelerator DICOM-RT interface and will facilitate connectivity between Elekta's digital linear accelerators and IMPAC's Oncology Management System Elekta, a world-leading supplier of advanced and innovative radiation oncology solutions and services, and IMPAC Medical Systems, Inc. (NASDAQ:IMPC), a leading provider of information management solutions for cancer care, announce today their agreement to use a full DICOM-RT compliant specification for the development of an interface to connect the Elekta product lines of digital linear accelerators (Elekta Synergy(TM) and Precise Treatment System(TM)) with IMPAC's oncology information management products. This interface will provide a vendor-independent means of facilitating universal connectivity of next-generation radiation treatment devices, such as linear accelerators and proton therapy delivery systems as well as treatment simulation devices to information management systems. IMPAC and Elekta are the first to formally adopt the standard. Both companies have been working together towards this goal over the past months. "This agreement will further improve seamless connectivity for customers by expanding the use of new technology systems as well as shorten the start-up time for new and expanding cancer centers ," stated Tomas Puusepp, Executive VP Sales, Marketing & Service at Elekta. "More importantly, patients will benefit from a more rapid deployment of leading edge treatments. We encourage all oncology vendors to join Elekta and IMPAC in adopting this standard." "This is a collaborative development effort aimed at improving the process of managing increasingly complex cancer treatment techniques," stated Joseph K. Jachinowski, president and CEO of IMPAC. "IMPAC is delighted to team with Elekta in this agreement to adopt the DICOM-RT standard in a complete manner," he added. ****** For further information, please contact: International: Peter Ejemyr, Group VP Corporate Communications, Elekta AB (publ), Phone: +46 733 611 000, e-mail: peter.ejemyr@elekta.com United States: Lars Jonsteg, VP Investor Relations North America, Elekta, USA Phone: +1 770-670-2419, e-mail: lars.jonsteg@elekta.com About Elekta: Elekta is a world-leading supplier of advanced and innovative radiation oncology and neurosurgery solutions and services for precise treatment of cancer and brain disorders. Elekta's solutions are clinically effective, cost efficient and gentle to the patient. For additional information about Elekta, please visit www.elekta.com About IMPAC Medical Systems IMPAC Medical Systems, Inc. is a leading provider of specialized IT solutions that streamline both clinical and business operations to help improve the process of delivering quality patient care. With open integration to multiple healthcare data and imaging systems, IMPAC offers a comprehensive IT solution that includes specialized electronic charting, full-featured practice management, clinical laboratory management, and outcomes reporting. Supporting over 1600 installations worldwide, IMPAC delivers practical solutions that deliver better overall communication, process efficiency and quality patient care. For more information about IMPAC Medical Systems' products and services, please call +1-650-623-8800 or visit www.impac.com. ------------------------------------------------------------ This information was brought to you by Waymaker http://www.waymaker.net The following files are available for download: http://www.waymaker.net/bitonline/2003/12/03/20031203BIT00020/wkr0001.doc http://www.waymaker.net/bitonline/2003/12/03/20031203BIT00020/wkr0002.pdf

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Elekta is proud to be the leading innovator of equipment and software used to improve, prolong and save the lives of people with cancer and brain disorders. Our advanced, effective solutions are created in collaboration with customers, and more than 6,000 hospitals worldwide rely on Elekta technology. Our treatment solutions and oncology informatics portfolios are designed to enhance the delivery of radiation therapy, radiosurgery and brachytherapy, and to drive cost efficiency in clinical workflows. Elekta employs 3,700 people around the world. Headquartered in Stockholm, Sweden, Elekta is listed on NASDAQ Stockholm. www.elekta.com