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 soft polymer that protects the back of the cassette.






2. Expands the digital grayscale to visible






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






4. Improves image contrast






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






6. Is erasing the plate signal






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






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






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






10. The greater the spatial image resolution.






11. Filters the light before photodetection occurs






12. Filters the light before photodetection occurs






13. 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






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






15. Determines average pixel value in quantitative imaging






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






17. Expands the digital grayscale to visible






18. 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.






19. Labeling the image






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






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






22. Improves image contrast






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






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






25. The greater the spatial image resolution.






26. Registering the image to correct for patient motion






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






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






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






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






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






32. Improves visualization and spatial resolution






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






34. What steps are included in 'readout processing






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






36. 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?






37. What is the typical pixel size?






38. What does pixel size determine






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






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






41. 0.1 mR up to maximum of 100 mR






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






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. 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. 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.






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






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






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






49. Detect (read) the stimulated emission






50. 2 eV - which is necessary to energize the trapped electrons.