title: Improved contrast in special procedures using a rotating aperture wheel (RAW) device.
abstract: A new scatter control technology consisting of multiple rotating aperture wheels (RAWs) is being developed to provide improved radiographic contrast and/or reduced patient dose in both single frame and dynamic procedures. The unique geometry of this system allows the conventional source-patient-image receptor geometric relationship to remain unchanged so that the device can be added to existing radiographic, fluoroscopic, and conventional tomographic installations. A prototype RAW device has been used with a rapid film changer for simulated abdominal angiography. The resulting images show improved contrast over those obtained with a standard 12:1 fixed grid.
mesh_terms: D000792:Angiography; D005471:Fluoroscopy; D055585:Physical Phenomena; D010825:Physics; D011829:Radiation Dosage; D011856:Radiographic Image Enhancement / Q000295:instrumentation*; D011859:Radiography / Q000295:instrumentation* / Q000379:methods; D014054:Tomography