Test your basic knowledge |

Digital Imaging Basics

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • Match each statement with the correct term.
  • Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.
1. A finely focused beam of infrared light with wavelength and beam diameter of 50 to 100 nm is directed at the PSP.






2. How many 'bits' does the typical CR system have?






3. The CR cassettes - phosphor plates - and CR reader.






4. Cassette-based digital imaging is the digital acquisition modality that uses storage phosphor plates to produce projection images






5. A soft polymer that protects the back of the cassette.






6. Improves visualization and spatial resolution






7. Labeling the image






8. Grounds the plate to eliminate electrostatic problems and absorb light to increase sharpness






9. What is the typical pixel size?






10. What are the steps in Computed Radiography Image Processing?






11. Source of stimulating light - Scans an extracted IP with a helium laser beam or solid-state laser diodes - Beam is about 100 µm wide with a wavelength of 633 nm (or 670 to 690 nm






12. Barium fluorohalide bromides and iodides with europium activators (BaFBr:Eu and BaFI:Eu)






13. Expands the digital grayscale to visible






14. A very thin - tough - clear plastic that protects the phosphor layer






15. Detect (read) the stimulated emission






16. Registering the image to correct for patient motion






17. Reorients image presentation and makes white black and black white






18. Emitted light from the IP is channeled into a funnel like fiber optic collection assembly and is directed at the photodetector - photomultiplier tube (PMT) photodiode (PD) or charge-coupled device (CCD






19. What is the typical pixel size?






20. Cassette-based digital imaging is the digital acquisition modality that uses storage phosphor plates to produce projection images






21. Defined as light produced by a phosphor (active layer) when struck by light or x-ray photons.






22. A soft polymer that protects the back of the cassette.






23. Source of stimulating light - Scans an extracted IP with a helium laser beam or solid-state laser diodes - Beam is about 100 µm wide with a wavelength of 633 nm (or 670 to 690 nm






24. Sends light in a forward direction when released in the cassette reader - This layer may be black to reduce the spread of stimulating light and the escape of emitted light.






25. The CR cassettes - phosphor plates - and CR reader.






26. How many 'bits' does the typical CR system have?






27. Number related to the amount of amplification required by the PM tube to adjust the digital image.






28. Prevents light from erasing data on the imaging plate or leaking through the backing - degreasing the spatial resolution.






29. Located between the active and support layers if the IP that absorbs the stimulating light but reflects emitted light. (for newer plates)






30. 2 eV - which is necessary to energize the trapped electrons.






31. 0.1 mR up to maximum of 100 mR






32. What steps are included in 'readout processing






33. What does pixel size determine






34. Holds the Photostimulable phosphor (PSP) - which is the active component in the plate.






35. Is erasing the plate signal






36. Improves image contrast






37. Reorients image presentation and makes white black and black white






38. Defined as light produced by a phosphor (active layer) when struck by light or x-ray photons.






39. Keeps the laser beam constant size - shape - speed and intensity






40. Performed to optimize the appearance of the image for purpose of better detecting pathology






41. X-ray beam exposes a PSP - the energy transfer results in excitation of electron into a metastable state.






42. Emitted light from the IP is channeled into a funnel like fiber optic collection assembly and is directed at the photodetector - photomultiplier tube (PMT) photodiode (PD) or charge-coupled device (CCD






43. In what steps is a blue-purple light emitted as the laser passes over the plate which is directly proportional to the x-ray energy absorbed in that specific area?






44. A finely focused beam of infrared light with wavelength and beam diameter of 50 to 100 nm is directed at the PSP.






45. Processes for amplitude - scale and compression - Shapes the signal before the final image is formed






46. The material in this layer absorbs and reduces static electricity






47. Barium fluorohalide bromides and iodides with europium activators (BaFBr:Eu and BaFI:Eu)






48. Sends light in a forward direction when released in the cassette reader - This layer may be black to reduce the spread of stimulating light and the escape of emitted light.






49. Improves visualization and spatial resolution






50. Holds the Photostimulable phosphor (PSP) - which is the active component in the plate.