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. Improves visualization and spatial resolution






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






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






4. Detect (read) the stimulated emission






5. Filters the light before photodetection occurs






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






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






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






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






10. Improves image contrast






11. What does pixel size determine






12. 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.






13. The greater the spatial image resolution.






14. Improves image contrast






15. Is erasing the plate signal






16. Registering the image to correct for patient motion






17. Receives light from the fiber optic collection assembly - and transmits a time-varying analog signal to a computer system






18. 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?






19. What steps are included in 'readout processing






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






21. 2 eV - which is necessary to energize the trapped electrons.






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






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






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






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






26. 0.1 mR up to maximum of 100 mR






27. What is the typical pixel size?






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






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






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






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






32. In what step is an amplifier used to match the PMT output signal to the ADC values?






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






34. 2 eV - which is necessary to energize the trapped electrons.






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






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






37. Labeling the image






38. Labeling the image






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






40. Improves visualization and spatial resolution






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






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






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






44. Determines average pixel value in quantitative imaging






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






46. Determines average pixel value in quantitative imaging






47. A semi-rigid material that gives the imaging sheet some strength and a base on which to coat the other layers.






48. Expands the digital grayscale to visible






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






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