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






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






3. Labeling the image






4. Registering the image to correct for patient motion






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






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






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






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






9. Determines average pixel value in quantitative imaging






10. Improves image contrast






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






12. Detect (read) the stimulated emission






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






14. 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?






15. Is erasing the plate signal






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






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






18. What is the typical pixel size?






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






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






21. The greater the spatial image resolution.






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






23. What does pixel size determine






24. Determines average pixel value in quantitative imaging






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






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






27. 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






28. What steps are included in 'readout processing






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






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






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






32. 0.1 mR up to maximum of 100 mR






33. Registering the image to correct for patient motion






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






35. Detect (read) the stimulated emission






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






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






38. 0.1 mR up to maximum of 100 mR






39. 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






40. What steps are included in 'readout processing






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






42. Improves image contrast






43. Expands the digital grayscale to visible






44. Filters the light before photodetection occurs






45. 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






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






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






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






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






50. Improves visualization and spatial resolution