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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. Filters the light before photodetection occurs






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






3. Labeling the image






4. 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?






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






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






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






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






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






10. 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?






11. 0.1 mR up to maximum of 100 mR






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. Improves image contrast






14. Filters the light before photodetection occurs






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






16. What is the typical pixel size?






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






18. What does pixel size determine






19. The greater the spatial image resolution.






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






21. 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






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






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






24. 2 eV - which is necessary to energize the trapped electrons.






25. Expands the digital grayscale to visible






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






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






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






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






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






33. Is erasing the plate signal






34. Registering the image to correct for patient motion






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






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






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






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






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






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






41. Determines average pixel value in quantitative imaging






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






43. Is erasing the plate signal






44. Labeling the image






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






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






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






48. Registering the image to correct for patient motion






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






50. What steps are included in 'readout processing