Apparatus for optical touch screen
PURPOSE: An apparatus for an optical touch screen is provided to accurately detect the storage location of a pointing device. CONSTITUTION: A light source(10) generates a light, and plural beam splitters(20) reflects some lights generated from the light source. The progression of the light reflected from some of plural beam splitters crosses the progression of the light reflected from the other beam splitters. The light source is a laser diode or an LED(Light Emitting Diode) generating an infrared ray. The plural beam splitters include a first heat beam splitter group and a second heat beam splitter group.
Background ::: Use of computer-assisted insertion of pedicle screws has some advantages owing to the reportedly decreased incidence of pedicle breach and clinical events. Registration-based methods based on preoperative computed tomography imaging, 2D fluoroscopy, and 3D fluoroscopy are the most popular, however each has its limitations. O-arm–based navigation, which uses intraoperative acquisition and registration of navigated images, may overcome many of these disadvantages. We set out to study the clinical accuracy and navigational accuracy for pedicle screw insertion using our recently acquired O-arm and present our preliminary findings.