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






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






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






4. Improves image contrast






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






6. 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






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






8. Determines average pixel value in quantitative imaging






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






10. Improves visualization and spatial resolution






11. Labeling the image






12. What steps are included in 'readout processing






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






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






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






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






17. Improves image contrast






18. 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






19. 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?






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






21. Determines average pixel value in quantitative imaging






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






23. Registering the image to correct for patient motion






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






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






26. Detect (read) the stimulated emission






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






28. Labeling the image






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






30. 0.1 mR up to maximum of 100 mR






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






32. What does pixel size determine






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






34. What does pixel size determine






35. Expands the digital grayscale to visible






36. Expands the digital grayscale to visible






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






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. What are the steps in Computed Radiography Image Processing?






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






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






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






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






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






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






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






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






48. 2 eV - which is necessary to energize the trapped electrons.






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






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







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