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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. Is erasing the plate signal






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






3. 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






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






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






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






7. 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






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






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






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






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






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






14. What steps are included in 'readout processing






15. What does pixel size determine






16. 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?






17. What does pixel size determine






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






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






20. Detect (read) the stimulated emission






21. 2 eV - which is necessary to energize the trapped electrons.






22. The greater the spatial image resolution.






23. Expands the digital grayscale to visible






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






25. Filters the light before photodetection occurs






26. Determines average pixel value in quantitative imaging






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






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






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






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






31. Improves image contrast






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






33. What is the typical pixel size?






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






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






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






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






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






39. What is the typical pixel size?






40. Improves visualization and spatial resolution






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






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






43. Detect (read) the stimulated emission






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






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






46. 0.1 mR up to maximum of 100 mR






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






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






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






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