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. Improves visualization and spatial resolution






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






3. Expands the digital grayscale to visible






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






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






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






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






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






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






10. What does pixel size determine






11. Determines average pixel value in quantitative imaging






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






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






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






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






16. Determines average pixel value in quantitative imaging






17. Registering the image to correct for patient motion






18. 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






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






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






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






23. 2 eV - which is necessary to energize the trapped electrons.






24. 0.1 mR up to maximum of 100 mR






25. 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.






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






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






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






29. 0.1 mR up to maximum of 100 mR






30. Filters the light before photodetection occurs






31. Labeling the image






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






33. Is erasing the plate signal






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






35. Expands the digital grayscale to visible






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






37. The greater the spatial image resolution.






38. Labeling the image






39. What is the typical pixel size?






40. Registering the image to correct for patient motion






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






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






43. 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






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






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






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






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






48. The greater the spatial image resolution.






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