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






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






3. 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?






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






5. 2 eV - which is necessary to energize the trapped electrons.






6. 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






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






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






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






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






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






12. Detect (read) the stimulated emission






13. Registering the image to correct for patient motion






14. Improves visualization and spatial resolution






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






16. Is erasing the plate signal






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






18. Expands the digital grayscale to visible






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






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






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






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






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






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






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






26. Improves image contrast






27. Registering the image to correct for patient motion






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






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






30. Filters the light before photodetection occurs






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






32. Is erasing the plate signal






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






34. What does pixel size determine






35. What is the typical pixel size?






36. Determines average pixel value in quantitative imaging






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






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






39. What is the typical pixel size?






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






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






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






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






44. 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?






45. 0.1 mR up to maximum of 100 mR






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






47. 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






48. Determines average pixel value in quantitative imaging






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






50. What steps are included in 'readout processing