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. Is erasing the plate signal






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






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






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






5. 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.






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






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






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






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






10. The greater the spatial image resolution.






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






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






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






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






15. What steps are included in 'readout processing






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






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






18. Detect (read) the stimulated emission






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






20. What steps are included in 'readout processing






21. 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?






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






23. What does pixel size determine






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






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






26. Labeling the image






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






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






29. 0.1 mR up to maximum of 100 mR






30. 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






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






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






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






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






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






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






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






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






39. Determines average pixel value in quantitative imaging






40. 0.1 mR up to maximum of 100 mR






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






42. What does pixel size determine






43. Improves visualization and spatial resolution






44. 2 eV - which is necessary to energize the trapped electrons.






45. The greater the spatial image resolution.






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






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






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






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






50. Improves image contrast