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Digital Imaging Basics

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • Match each statement with the correct term.
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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. X-ray beam exposes a PSP - the energy transfer results in excitation of electron into a metastable state.






2. 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?






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






4. Determines average pixel value in quantitative imaging






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






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






7. Registering the image to correct for patient motion






8. The greater the spatial image resolution.






9. 2 eV - which is necessary to energize the trapped electrons.






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






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






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






13. Detect (read) the stimulated emission






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






15. 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.






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






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






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






19. Is erasing the plate signal






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






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






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






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






24. Detect (read) the stimulated emission






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






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






27. Is erasing the plate signal






28. What is the typical pixel size?






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






30. What steps are included in 'readout processing






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






32. Expands the digital grayscale to visible






33. Improves visualization and spatial resolution






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






35. Filters the light before photodetection occurs






36. 0.1 mR up to maximum of 100 mR






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






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






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






41. 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.






42. What does pixel size determine






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






44. Improves image contrast






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






46. The greater the spatial image resolution.






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






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






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






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







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