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. Filters the light before photodetection occurs






2. 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






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






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






5. 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.






6. The greater the spatial image resolution.






7. 2 eV - which is necessary to energize the trapped electrons.






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






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






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






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






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






13. The greater the spatial image resolution.






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






15. Determines average pixel value in quantitative imaging






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






17. 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?






18. Improves image contrast






19. Registering the image to correct for patient motion






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






21. 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






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






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






24. What steps are included in 'readout processing






25. Is erasing the plate signal






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






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






28. 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?






29. Detect (read) the stimulated emission






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






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






32. 2 eV - which is necessary to energize the trapped electrons.






33. 0.1 mR up to maximum of 100 mR






34. What does pixel size determine






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






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






37. Detect (read) the stimulated emission






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






39. Determines average pixel value in quantitative imaging






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






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 is the typical pixel size?






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






44. Improves visualization and spatial resolution






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






46. 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






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






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






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






50. 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.