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Digital Imaging Basics

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
  • If you are not ready to take this test, you can study here.
  • 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. Expands the digital grayscale to visible






2. 0.1 mR up to maximum of 100 mR






3. Filters the light before photodetection occurs






4. Determines average pixel value in quantitative imaging






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






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






7. Is erasing the plate signal






8. What steps are included in 'readout processing






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






10. The greater the spatial image resolution.






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






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






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






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






15. 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?






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






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






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






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






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






21. What steps are included in 'readout processing






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






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






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






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






26. Improves visualization and spatial resolution






27. Filters the light before photodetection occurs






28. What is the typical pixel size?






29. What does pixel size determine






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






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






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






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






34. Detect (read) the stimulated emission






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






36. Registering the image to correct for patient motion






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






38. Expands the digital grayscale to visible






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






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 is the typical pixel size?






43. Is erasing the plate signal






44. 2 eV - which is necessary to energize the trapped electrons.






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






46. 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






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






48. 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






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






50. Labeling the image