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 is the typical pixel size?






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






3. What steps are included in 'readout processing






4. Expands the digital grayscale to visible






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






6. 0.1 mR up to maximum of 100 mR






7. Determines average pixel value in quantitative imaging






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






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






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






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






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






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






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






15. 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?






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






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






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






19. 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






20. Filters the light before photodetection occurs






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






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






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






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






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






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






28. What is the typical pixel size?






29. 0.1 mR up to maximum of 100 mR






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






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






32. Determines average pixel value in quantitative imaging






33. Improves visualization and spatial resolution






34. The greater the spatial image resolution.






35. What does pixel size determine






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






37. 2 eV - which is necessary to energize the trapped electrons.






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






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






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






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






42. Improves visualization and spatial resolution






43. 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.






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






45. 2 eV - which is necessary to energize the trapped electrons.






46. Improves image contrast






47. What does pixel size determine






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






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






50. 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.