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 very thin - tough - clear plastic that protects the phosphor layer






2. Detect (read) the stimulated emission






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






4. Improves visualization and spatial resolution






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






6. Labeling the image






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






8. 2 eV - which is necessary to energize the trapped electrons.






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






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






11. Registering the image to correct for patient motion






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






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






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






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






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






17. 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?






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






19. 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






20. Improves image contrast






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






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






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






24. Expands the digital grayscale to visible






25. What steps are included in 'readout processing






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






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






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






29. 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






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






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






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






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






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






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






36. 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






37. Registering the image to correct for patient motion






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






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






40. Filters the light before photodetection occurs






41. Determines average pixel value in quantitative imaging






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






43. Is erasing the plate signal






44. 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






45. Is erasing the plate signal






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






47. Detect (read) the stimulated emission






48. 2 eV - which is necessary to energize the trapped electrons.






49. The greater the spatial image resolution.






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