Test your basic knowledge |

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






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






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






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






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






6. 2 eV - which is necessary to energize the trapped electrons.






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






8. 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.






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






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






11. What is the typical pixel size?






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






13. 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






14. 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






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






16. Improves visualization and spatial resolution






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






18. Expands the digital grayscale to visible






19. Improves visualization and spatial resolution






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






21. Determines average pixel value in quantitative imaging






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






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






24. Filters the light before photodetection occurs






25. 0.1 mR up to maximum of 100 mR






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






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






28. 0.1 mR up to maximum of 100 mR






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






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






31. Detect (read) the stimulated emission






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






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






34. The greater the spatial image resolution.






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






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






37. 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






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






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






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






41. 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






42. What steps are included in 'readout processing






43. What steps are included in 'readout processing






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






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






46. Is erasing the plate signal






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






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






49. Improves image contrast






50. 2 eV - which is necessary to energize the trapped electrons.