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






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






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






4. What does pixel size determine






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






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






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






8. Filters the light before photodetection occurs






9. 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?






10. 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.






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






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






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






14. What steps are included in 'readout processing






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






16. Registering the image to correct for patient motion






17. 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






18. Detect (read) the stimulated emission






19. 2 eV - which is necessary to energize the trapped electrons.






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






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






22. What is the typical pixel size?






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






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






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






26. 0.1 mR up to maximum of 100 mR






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






28. Improves visualization and spatial resolution






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






30. Detect (read) the stimulated emission






31. Improves image contrast






32. Is erasing the plate signal






33. 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?






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






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






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






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






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






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






40. Labeling the image






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






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






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






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






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






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






49. The greater the spatial image resolution.






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