Digital Radiography

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  1. 2. The location of a pixel within the image matrix in three-dimensional space.
  2. 5. The smallest controllable element of a digital image. Pixels represent numerical data that can be manipulated to form the image. Pixel size, pitch, and number affect image resolution and quality.
  3. 6. (2 words) The gradual increase in radiation exposure over time to reduce image noise. While it improves image quality, it also increases patient radiation dose and must be carefully managed.
  4. 8. (2 words) An advanced imaging system where the image receptor is built into the X-ray table. It captures and transfers the image directly to a computer via Bluetooth, without using cassettes. It uses a scintillation phosphor plate with thin film transistors and pixel capture systems.
  5. 11. Unwanted exposure or stimulation of the imaging plate, often due to scatter radiation. It results in a hazy or diffuse appearance on the radiograph, reducing image clarity.
  6. 12. Imaging Plate - The cassette component in CR systems that contains the PSP crystals. It captures the latent image and must be processed to produce a digital radiograph.
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  1. 1. (2 words) A digital imaging system that uses a cassette containing an imaging plate with photostimulable phosphors (PSPs). The latent image formed by electron shifts is read by a red laser and converted into a digital image. Eliminates the need for film, chemicals, and darkrooms.
  2. 3. The process of using a white laser to erase the imaging plate in CR systems, returning all electrons to their steady state. This prevents fogging and prepares the plate for reuse. It should be done daily.
  3. 4. (3 words) The number of shades of grey a digital system can display, determined by the computer's bit capacity. For example, 12-bit depth allows 4,096 shades of grey. Higher bit depth improves image density and contrast.
  4. 7. Photostimulable Phosphor - A material (typically barium fluorohalide) inside the imaging plate of CR systems that stores energy from X-ray exposure. When stimulated by a laser, it releases light proportional to the exposure, which is then converted into a digital image.
  5. 9. A permanent residual image left on the imaging plate from a previous exposure. It occurs when the plate cannot be fully erased and must be replaced.
  6. 10. (2 words)Random variations in shades of grey caused by scattered photons or system defects. It is most common in CR and can be reduced by increasing radiation exposure, though this leads to dose creep.