Computed Radiography Image Artifacts seen in images caused by using a grid with a frequency of 33 lines/cm, which are orient - ed with grid lines parallel to the plate reader's scan lines (Fig. 8). Grids with 60 lines/cm or more should be used, and the grid lines should Computed Radiography Cr Digital Radiography Dr3148 - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. Computed radiography (CR) and digital radiography (DR) are rapidly replacing screen-film imaging systems in many countries. Both are similar in technology except for the image receptor. CR uses photostimulable phosphor (PSP) plates which must be transported to a digital scanner (or reader) and scanned with a laser beam to convert the stored Zscherpel, Ewert Computed Radiography April 2007 Comparison of step wedge exposures Comparison of step wedge exposures X-ray tube BAS 2000 IP Film a) Imaging plate system with log. amplifier. The grey level is proportional to the wall thickness. b) Digitized film. The grey level is proportional to the light intensity behind the film. Computed radiography is one of the most promising digital radiography techniques, and is expected to replace the conventional screen film radiography in the near future. This book is the first textbook on computed radiography written by Japanese authors and describes basic technologies and clinical results obtained at various hospitals. 3. Computed Radiography (CR) is the generic term applied to an imaging system comprised of: ★Photostimulable Storage Phosphor to acquire the x-ray projection image ★ CR Reader to extract the electronic latent image ★ Digital electronics to convert the signals to digital form. 4. Computed Radiography (CR) uses very similar equipment to Artefacts found in computed radiography. Artefacts on radiographic images are distracting and may compromise accurate diagnosis. Although most artefacts that occur in conventional radiography have become familiar, computed radiography (CR) systems produce artefacts that differ from those found in conventional radiography. Computed radiography (CR) is the use of photostimulable phosphor as an image receptor. The image receptor is held in a similar casing (cassette) to that of the traditional film screen. Computed radiography harnesses the absorption of radiation, trapping electrons at energy levels via the process of photostimulable luminescence. Electron storage OF COMPUTED RADIOGRAPHY . Computed radiography (CR) uses a cassette similar to a film cassette. Instead of film, the cassette holds an imaging plate (IP), which is similar to an intensifying screen. Instead of emitting light when x-rays interact with it, the IP stores the x-ray energy in proportion to the intensity it receives. Both computed radiography (CR) and digital radiography (DR) require the use of digital technologies which rely on computer networks and high-bandwidth web facilities. DR uses flat panel detectors 1. COMPUTED RADIOGRAPHY (CR) - AN OVERVIEW AND EVALUATION OF PIPE WALL THICKNESS BASED ON CONTRAST MEASUREMENT C H YADHUKRISHNA (213118008) ILLYAS M K (213118010) MUHAMED MUSTHAFA PULIKKAL (213118015) 2. INTRODUCTION Computed radiography (CR), also commonly known as Photostimulable phosphor (PSP) imaging. It employs reusable imaging plates and Working of Computed Radiography The light is then detected by a highly sensitive analogue device known as a photomultiplier (PMT) and converted to a digital signal u