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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. The greater the spatial image resolution.






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






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






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






5. Improves visualization and spatial resolution






6. What steps are included in 'readout processing






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






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






9. Labeling the image






10. 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.






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






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






13. What steps are included in 'readout processing






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






15. Detect (read) the stimulated emission






16. Improves visualization and spatial resolution






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






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






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






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






21. 0.1 mR up to maximum of 100 mR






22. Filters the light before photodetection occurs






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






24. Labeling the image






25. 2 eV - which is necessary to energize the trapped electrons.






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






27. What does pixel size determine






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






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






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






31. 2 eV - which is necessary to energize the trapped electrons.






32. Detect (read) the stimulated emission






33. What is the typical pixel size?






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






35. 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?






36. Filters the light before photodetection occurs






37. Expands the digital grayscale to visible






38. 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






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






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






41. Registering the image to correct for patient motion






42. 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






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






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






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






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






47. 0.1 mR up to maximum of 100 mR






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






49. 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.






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






Can you answer 50 questions in 15 minutes?



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