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






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






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






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






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






6. 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.






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






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






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






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






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






13. Improves visualization and spatial resolution






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






15. Expands the digital grayscale to visible






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






17. Improves image contrast






18. Detect (read) the stimulated emission






19. Labeling the image






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






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






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






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






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






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






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






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






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






29. 2 eV - which is necessary to energize the trapped electrons.






30. Determines average pixel value in quantitative imaging






31. 0.1 mR up to maximum of 100 mR






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






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






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






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






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 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?






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






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






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






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






42. Filters the light before photodetection occurs






43. What steps are included in 'readout processing






44. 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.






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






46. The greater the spatial image resolution.






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






48. Registering the image to correct for patient motion






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






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






Can you answer 50 questions in 15 minutes?



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