ELEKTA AB ACQUIRES IMPAC MEDICAL SYSTEMS, INC.

PRESS RELEASE Stockholm, Sweden, April 4, 2005 Elekta AB (publ) (SSE: EKTAb) today announced the completion of its acquisition of IMPAC Medical Systems, Inc. (Nasdaq: IMPC - News), following approval of the transaction by IMPAC’s stockholders.

Today, April 4, 2005, the stockholders of IMPAC approved the agreement with Elekta to merge IMPAC with a subsidiary of Elekta. Following the merger, which was effective today, IMPAC has become a wholly owned subsidiary of Elekta. Under the terms of the agreement and plan of merger, Elekta will pay USD 24.00 in cash for each share of IMPAC common stock outstanding. Effective today, IMPAC’s common stock will no longer trade on the NASDAQ National Market. IMPAC stockholders who hold their shares directly will receive instructions in the mail describing the process to exchange their IMPAC stock certificates for the cash payment. IMPAC stockholders whose shares are held through intermediaries such as banks or brokers will receive information about their holdings from those institutions. ********