Arthur Hiller has been named CEO and director at Heartscape Technologies (Columbia, Maryland). Hiller was formerly senior vice president at Millennium Pharmaceuticals. Heartscape makes devices that diagnose heart attacks and ischemia.

Darlene Deptula-Hicks has been named executive vice president of finance and CFO of iCAD (Nashua, New Hampshire). Most recently, Deptula-Hicks was executive vice president, CFO and treasurer of ONI Medical Systems. Before ONI, Deptula-Hicks was executive vice president, CFO, and treasurer of Implant Sciences. iCAD makes computer-aided detection (CAD) solutions.

• Immucor (Norcross, Georgia) a company that provides providing automated instrument-reagent systems to the blood transfusion industry, reported the retirement of Edward Gallup as CEO and the election of Gioacchino (Nino) De Chirico as his successor, effective immediately. Gallup will also retire as chairman of the board and director after the company's upcoming annual meeting of shareholders, scheduled for Nov. 15, after which Joseph Rosen will become the independent chairman. Gallup was a founder of the company in 1982 and its only CEO almost continually since then. Under his leadership the company said it grew from about $6 million in revenue with 65 employees in one location in 1985, the year the company went public, to about $183 million in revenue with 563 employees at nine locations worldwide for the just completed 2006 fiscal year. Gallup will remain employed by the company through Jan. 31, 2007 to assist with the transition. De Chirico joined the company in 1994 as the president of Immucor Italia, a subsidiary of the company, then served as the company's director of European Operations before he was promoted to president/COO in 2003. Before joining the company he was employed by Ortho Diagnostic Systems, as general manager, Immunocytometry. Rosen has been a director of the company since its inception except for a three-year hiatus in 1995-98.

Kenneth Rardin has been named president/CEO of Merge Technologies Incorporated (d.b.a. Merge Healthcare; Milwaukee). Prior to joining Merge Healthcare, Rardin was chairman/CEO of Park City Solutions. Merge develops medical imaging and information management software and services.

Paul Landers has announced his retirement as CFO from Quidel (San Diego) effective March 31, 2007. Landers has been CFO for five years. Quidel makes point-of-care rapid diagnostic tests.

Harry Mitchell has been named CFO, treasurer and vice president of finance for Sontra Medical (Franklin, Massachusetts). Sontra makes non-invasive, continuous transdermal glucose monitors for use in the intensive care market.