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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. 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?






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






3. Detect (read) the stimulated emission






4. 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






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






6. Expands the digital grayscale to visible






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






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






9. 0.1 mR up to maximum of 100 mR






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






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






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






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






14. 0.1 mR up to maximum of 100 mR






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






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 is the typical pixel size?






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






19. Filters the light before photodetection occurs






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






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






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






23. Registering the image to correct for patient motion






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






25. 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






26. 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.






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






28. Is erasing the plate signal






29. What does pixel size determine






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






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






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






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






34. Determines average pixel value in quantitative imaging






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






36. Is erasing the plate signal






37. What does pixel size determine






38. Labeling the image






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






40. Expands the digital grayscale to visible






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






42. The greater the spatial image resolution.






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






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






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






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






47. 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






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






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






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