Boston, MA; a manufacturer of intra-operative medical devices and related products for use in minimally invasive image guided surgery. In 2003, GE HealthCare acquired Instrumentarium (including its Datex-Ohmeda division), a producer, manufacturer, and supplier of anesthesia machines and mechanical ventilators. To satisfy regulatory concerns in the United States and in Europe, GE HealthCare was forced to divest Instrumentarium's Ziehm Imaging mobile C-arm business, as well as its Spacelabs patient-monitoring unit. Currently, GE HealthCare owns 80% of all anesthesia machines in the United States and 60% of the machines in the world. The former Instrumentarium business was incorporated into GE HealthCare's Clinical Systems business segment.In 2004, the former Amersham plc business segments were separated into the GE HealthCare Medical Diagnostics and Life Sciences business segments and 1 May 2013, both the business were combined again under the GE Life Sciences brand with Kieran Murphy taking the leadership role. Also in 2004, GE HealthCare along with other healthcare companies built a research reactor for neutron and unit cell research at GE's European Research Center near Garching (outside of Munich), Germany. It is the only such reactor currently in operation. In 2005, Sir William Castell, CEO of GE HealthCare and former CEO of Amersham plc stepped down as CEO to become Chairman of the Wellcome Trust—a charity that fosters and promotes human and animal research—in the United Kingdom. Former GE Medical Systems CEO Joe Hogan became the overall CEO for the GE HealthCare business. In 2005, Dental Imaging operations were separated from GE HealthCare. The PaloDEx Group Oy was founded and continues the business with its subsidiaries Instrumentarium Dental and SOREDEX. Specifically, Instrumentarium Dental continues the brands Orthopantomograph and intraoral systems FOCUS and SIGMA, formerly known as Instrumentarium Imaging or GE HealthCare products. In September 2005, GE HealthCare and IDX Systems Corporation announced that they entered into a definitive, $1.2 billion merger agreement for GE to acquire IDX, a leading healthcare information technology (IT) provider. The acquisition was completed in January 2006. IDX was folded into GE HealthCare Integrated IT Solutions, which specializes in clinical information systems and healthcare revenue management. On 4 February 2008, GE HealthCare announced that it had completed the acquisition of Whatman plc (LSE:WHM), a global supplier of filtration products and technologies at 270p per share in cash for each Whatman share, valuing Whatman at approximately £363 million (approximately $713 million.) In July 2008, Joseph Hogan announced his intent