Test your basic knowledge |

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






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






3. Improves image contrast






4. What steps are included in 'readout processing






5. What is the typical pixel size?






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






7. What does pixel size determine






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






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






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






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






12. Detect (read) the stimulated emission






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






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






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






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






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






18. 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?






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






20. 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.






21. 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






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






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






24. Labeling the image






25. Labeling the image






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






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






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






29. 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






30. Registering the image to correct for patient motion






31. Detect (read) the stimulated emission






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






33. Registering the image to correct for patient motion






34. Improves visualization and spatial resolution






35. 2 eV - which is necessary to energize the trapped electrons.






36. Improves visualization and spatial resolution






37. Expands the digital grayscale to visible






38. 0.1 mR up to maximum of 100 mR






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






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






41. Expands the digital grayscale to visible






42. Is erasing the plate signal






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






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






45. 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






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






47. Determines average pixel value in quantitative imaging






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






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






50. 0.1 mR up to maximum of 100 mR