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






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






3. Improves image contrast






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






5. Expands the digital grayscale to visible






6. Labeling the image






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






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






9. Improves visualization and spatial resolution






10. Registering the image to correct for patient motion






11. 2 eV - which is necessary to energize the trapped electrons.






12. From 512 x 512 to 1024 x 1024 for CT - but can be as large as 2500 x 2500 for radiography.






13. 2 eV - which is necessary to energize the trapped electrons.






14. Is erasing the plate signal






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






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






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






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






19. The greater the spatial image resolution.






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






21. Is erasing the plate signal






22. What does pixel size determine






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






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






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






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






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






28. 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.






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






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






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






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






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






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






35. Labeling the image






36. Determines average pixel value in quantitative imaging






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






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






39. Determines average pixel value in quantitative imaging






40. Filters the light before photodetection occurs






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






42. 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






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. What are the steps in Computed Radiography Image Processing?






45. What is the typical pixel size?






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






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






48. Improves image contrast






49. What steps are included in 'readout processing






50. 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