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. What does pixel size determine






2. What steps are included in 'readout processing






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






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






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






6. Determines average pixel value in quantitative imaging






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






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






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






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






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






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






13. Expands the digital grayscale to visible






14. 2 eV - which is necessary to energize the trapped electrons.






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






16. 2 eV - which is necessary to energize the trapped electrons.






17. Filters the light before photodetection occurs






18. Expands the digital grayscale to visible






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






20. Detect (read) the stimulated emission






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






22. Determines average pixel value in quantitative imaging






23. Registering the image to correct for patient motion






24. Is erasing the plate signal






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






26. What is the typical pixel size?






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






28. Improves image contrast






29. Registering the image to correct for patient motion






30. 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






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






32. Improves visualization and spatial resolution






33. 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?






34. What does pixel size determine






35. Improves visualization and spatial resolution






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






37. 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.






38. 0.1 mR up to maximum of 100 mR






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






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






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






42. 0.1 mR up to maximum of 100 mR






43. 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






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






45. The greater the spatial image resolution.






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






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






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






49. 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






50. What is the typical pixel size?