Test your basic knowledge |

Digital Imaging Basics

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. Located between the active and support layers if the IP that absorbs the stimulating light but reflects emitted light. (for newer plates)






2. Improves visualization and spatial resolution






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






4. Improves image contrast






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






6. Labeling the image






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






8. Labeling the image






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






10. Detect (read) the stimulated emission






11. Determines average pixel value in quantitative imaging






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






13. 2 eV - which is necessary to energize the trapped electrons.






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






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






16. The greater the spatial image resolution.






17. What is the typical pixel size?






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






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






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






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






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






24. 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?






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






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






27. Is erasing the plate signal






28. Determines average pixel value in quantitative imaging






29. What is the typical pixel size?






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






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






32. What steps are included in 'readout processing






33. Expands the digital grayscale to visible






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






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






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






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






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






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






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






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






42. What steps are included in 'readout processing






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






44. Filters the light before photodetection occurs






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






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






47. Registering the image to correct for patient motion






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






49. Improves image contrast






50. 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