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






2. Improves image contrast






3. 2 eV - which is necessary to energize the trapped electrons.






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






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






6. Detect (read) the stimulated emission






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






8. What does pixel size determine






9. What does pixel size determine






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






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






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






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






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






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






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






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






18. Determines average pixel value in quantitative imaging






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






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






21. 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






22. Registering the image to correct for patient motion






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






24. 0.1 mR up to maximum of 100 mR






25. Detect (read) the stimulated emission






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






27. 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






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






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






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






31. 0.1 mR up to maximum of 100 mR






32. What is the typical pixel size?






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






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






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






36. 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?






37. Is erasing the plate signal






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






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






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






41. Determines average pixel value in quantitative imaging






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






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






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






45. What is the typical pixel size?






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






47. 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?






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






49. Improves image contrast






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