NEWPORT BEACH, Calif. (AP) ¿ Alliance HealthCare Services Inc. which provides diagnostic imaging and cancer-treating radiation services, on Thursday reaffirmed it 2009 revenue outlook but expects a dip in 2010. The company still expects between $503 million and $518 million in revenue in 2009. Meanwhile, it set 2010 revenue guidance between $470 million and $500 million. Analysts polled by Thomson Reuters expect 2009 revenue of about $506 million and 2010 revenue of about $508.4 million. Alliance also expects to open between 20 and 25 fixed-site imaging centers and expects to open five to eight radiation therapy centers in 2010. Shares of Alliance fell 1 cent to $6.05 in after-hours trading after rising 1 cent to close at $6.06 during the regular trading session.