Ce diaporama a bien été signalé.
Le téléchargement de votre SlideShare est en cours. ×

Radiology lecture 2 CR and DR .pptx

Publicité
Publicité
Publicité
Publicité
Publicité
Publicité
Publicité
Publicité
Publicité
Publicité
Publicité
Publicité
Prochain SlideShare
X-ray.pptx
X-ray.pptx
Chargement dans…3
×

Consultez-les par la suite

1 sur 22 Publicité
Publicité

Plus De Contenu Connexe

Plus récents (20)

Publicité

Radiology lecture 2 CR and DR .pptx

  1. 1. M Irshad Siddiqi MID Lecturer Radiology
  2. 2. Difference Between Computed Radiography(CR) And  Digital Radiography(DR)
  3. 3.  Radiography is an imaging technique using X-rays, gamma rays, or similar radiation to view the internal form of an object. To create the image, a beam of X- rays or other form of electromagnetic radiation is produced by an X-ray generator and is projected toward the object.
  4. 4.  Conventional Radiography  Computed Radiography  Digital Radiography
  5. 5. How does it work ?  Computed radiography (CR) is the digital replacement of conventional X- ray film radiography and offers enormous advantages for inspection tasks, the use of consumables is virtually eliminated and the time to produce an image is drastically shortened.
  6. 6.  Imaging plates are reusable  No darkroom or chemicals needed  Reduction in exposure and processing time  Software-based evaluation and reporting  Simple digital information exchange and archiving  Furthermore, more details are visible and analyzable with computed radiography due to a higher dynamic range when compared to film. Other advantages over film include a more simplified workflow, a safer working environment for operators and a more environmentally-friendly chemical-free process.
  7. 7.  Instead of film, an imaging plate is exposed to X-ray or gamma radiation.  The imaging plate is digitized by the scanner and then erased for immediate reuse.  The digital image is then displayed on a computer monitor for evaluation with specialized software.
  8. 8.  In computed radiography, when imaging plates are exposed to X-rays or gamma rays, the energy of the incoming radiation is stored in a special phosphor layer. A specialized machine known as a scanner is then used to read out the latent image from the plate by stimulating it with a very finely focused laser beam. When stimulated, the plate emits blue light with intensity proportional to the amount of radiation received during the exposure. .
  9. 9.  The light is then detected by a highly sensitive analog device known as a photomultiplier Tube (PMT) and converted to a digital signal using an analog-to-digital converter (ADC). The generated digital X-ray image can then be viewed on a computer monitor and evaluated.
  10. 10. Imaging Plate Scanner  High resolution CR scanner for all NDT radiography applications - weld testing, profile images and aerospace. Imaging Plates  IPs are available in different resolutions and all standard formats and, on request, in special sizes and custom shapes. D-Tec Software  All functions from image acquisition, analysis and related report generation, to export, archiving and database management are included.
  11. 11.  Radiographic Testing (RT) is a non- destructive testing (NDT) method which uses either x-rays or gamma rays to examine the internal structure of manufactured components identifying any flaws or defects.
  12. 12. CR Imaging plate (reusable) itions and red No darkroom conditions or chemistry required 1-3 minutes (depending on scan resolution) Computer with viewing/analysis software om ntrolled) PC, cloud / remote network server Unlimited copies with
  13. 13.  DR in the short term is the latest technology in radiography. The DR technology transfer automatically the images to a computer. So you can quickly evaluate and propose a diagnosis. As it is a recent advancement, it is, of course, slightly expensive compared to Computed Radiography but with a lot of advantages.
  14. 14.  Is a cassete-less system  Uses a flat pannel detector or charge coupled devices which is connected to a computer  Flat panel detectors (FPDs) are the most common kind of direct digital detectors. They are classified in two main categories  Direct FPDs  Indiect FPDs
  15. 15. CR DR Imaging plate Transistor receiver ( like Bucky ) Processed in a digital reader Directly into digital system Signal sent to computer And viewed on computer Seen immediately on computer

Notes de l'éditeur

  • Conventional dark room long procedure
  • Film reuse hoti thi direct screen pe imGe nae aati thi
  • Image can be send save
  • Detectors are presrnt in imaging plate detect in form of energy and show on screen indigitial form
  • Latent image is first position
    Phosphor layer ko khrab nae krta
  • Film is coventional radiography
    Chemistry… chemical
    Film veiwer green blue light luminator se clearly nzr ata

×