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IMAGE RECEPTORS

IMAGE RECEPTORS. Follow the Sequence- Film System. Tube Patient (bucky) or non-bucky Cassette INTENSIFYING SCREEN FILM . Follow the Sequence- Filmless (CR) System. Tube Patient (bucky) or non-bucky Cassette IMAGING PLATE DIGITIZER OR READER MONITOR.

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IMAGE RECEPTORS

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  1. IMAGE RECEPTORS

  2. Follow the Sequence- Film System • Tube • Patient • (bucky) or non-bucky • Cassette • INTENSIFYING SCREEN • FILM

  3. Follow the Sequence- Filmless (CR) System • Tube • Patient • (bucky) or non-bucky • Cassette • IMAGING PLATE • DIGITIZER OR READER • MONITOR

  4. Follow the Sequence- Filmless (DR) System • Tube • Patient • (bucky) or non-bucky • DIGITAL RECEPTOR • MONITOR

  5. INTENSIFYING SCREEN • PG 179 • When using intensifying screens in cassette the exposure to the film is 90% -99% FROM LIGHT • Anatomy of a screen • Protective layer • Phosphor or active layer • Reflecting or absorbing layer • base

  6. PHOSPHORS • SPECTRAL EMISSION • RARE EARTH • HIGH ABSORPTION +HIGH CONVERSION EFFICIENCY= • FASTER SPEED

  7. PHOSPHOR THICKNESS, SIZE • Impacts screen speed and detail • Faster screen =less detail = less mAs • Slower screen = more detail =more mAs • Old screen speed/new screen speed • Reflecting layers = increase screen speed • Light absorbing layer or light absorbing dyes=decrease speed but increase recorded detail • Table 7-9 • Quantum Mottle • Screen Maintenance

  8. Follow the Sequence- Filmless (CR) System • Tube • Patient • (bucky) or non-bucky • Cassette • IMAGING PLATE • DIGITIZER OR READER • MONITOR

  9. CR cassette • Protective layer • Photostimulable phosphor • Reflective layer • Base • Backing

  10. Barium Fluorohalide crystals coated with europium • Phosphor releases some visible light • The x-ray energy is absorbed (trapped) • Latent image • Sensitive to a wide range of energies • Erase plate if not used in 48 hours • Process within an hour of exposure • Increase mAs as CR is equivalent to 200 screen speed vs 400 screen speed used in film systems…why?

  11. Follow the Sequence- Filmless (DR) System • Tube • Patient • (bucky) or non-bucky • DIGITAL RECEPTOR • MONITOR

  12. DIRECT CAPTURE DETECTOR • TFT –Thin film transistors –flat panel consists of detectors and TFT’s • Radiation interacts with the detector (within the table, upright chest unit or on a extremity unit) • X-rays are either converted to light that reacts to a layer of amorphous silver = electric chargeCCD (CHARGE COUPLED DEVICE) Or • X-rays are interact directly with layer of amorphous silver = electric charge

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