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






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






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






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






5. 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?






6. What steps are included in 'readout processing






7. 0.1 mR up to maximum of 100 mR






8. Improves image contrast






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






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






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






12. What is the typical pixel size?






13. Labeling the image






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






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






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. What are the steps in Computed Radiography Image Processing?






19. Filters the light before photodetection occurs






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






21. Determines average pixel value in quantitative imaging






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






23. 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?






24. 2 eV - which is necessary to energize the trapped electrons.






25. Determines average pixel value in quantitative imaging






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






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






28. What does pixel size determine






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






30. Registering the image to correct for patient motion






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






32. 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






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






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






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






36. The greater the spatial image resolution.






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






38. What is the typical pixel size?






39. Expands the digital grayscale to visible






40. Improves visualization and spatial resolution






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






42. Is erasing the plate signal






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






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






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






46. Is erasing the plate signal






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






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






49. Registering the image to correct for patient motion






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







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