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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. Improves visualization and spatial resolution






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






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






4. Expands the digital grayscale to visible






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






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






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






8. What is the typical pixel size?






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






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






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






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






13. Registering the image to correct for patient motion






14. What steps are included in 'readout processing






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






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






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






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






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






21. 0.1 mR up to maximum of 100 mR






22. 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






23. Is erasing the plate signal






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






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






26. Determines average pixel value in quantitative imaging






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






28. Is erasing the plate signal






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






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






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






34. The greater the spatial image resolution.






35. What does pixel size determine






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






37. Labeling the image






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






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






40. Registering the image to correct for patient motion






41. Expands the digital grayscale to visible






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






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






44. What steps are included in 'readout processing






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






46. 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






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






48. 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?






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






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







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