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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.
  • 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. 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






2. What is the typical pixel size?






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






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






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






6. Improves image contrast






7. Labeling the image






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






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






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






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






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






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






14. What does pixel size determine






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






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






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






18. Registering the image to correct for patient motion






19. Expands the digital grayscale to visible






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






21. What is the typical pixel size?






22. What does pixel size determine






23. Improves image contrast






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






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






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






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






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






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






30. The greater the spatial image resolution.






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






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






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






34. Detect (read) the stimulated emission






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






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






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






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






39. 2 eV - which is necessary to energize the trapped electrons.






40. 0.1 mR up to maximum of 100 mR






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






42. Filters the light before photodetection occurs






43. 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






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






45. The greater the spatial image resolution.






46. 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?






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






48. Expands the digital grayscale to visible






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






50. 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.







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