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. What does pixel size determine






3. Filters the light before photodetection occurs






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






5. 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






6. What is the typical pixel size?






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






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






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






10. What steps are included in 'readout processing






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






12. 0.1 mR up to maximum of 100 mR






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






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






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






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






17. Improves visualization and spatial resolution






18. Expands the digital grayscale to visible






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






20. 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.






21. The greater the spatial image resolution.






22. 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






23. Filters the light before photodetection occurs






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






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






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






27. Determines average pixel value in quantitative imaging






28. Detect (read) the stimulated emission






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






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






31. 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?






32. What steps are included in 'readout processing






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






34. Registering the image to correct for patient motion






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






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






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






38. Improves image contrast






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






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






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






42. Is erasing the plate signal






43. 2 eV - which is necessary to energize the trapped electrons.






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






45. 0.1 mR up to maximum of 100 mR






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






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






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






49. 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.






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