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






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






3. Registering the image to correct for patient motion






4. Improves image contrast






5. Registering the image to correct for patient motion






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






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






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






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






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






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






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






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






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






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






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






17. 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.






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






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






20. Detect (read) the stimulated emission






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






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






23. What is the typical pixel size?






24. 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






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






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






27. 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






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






29. Expands the digital grayscale to visible






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






31. Filters the light before photodetection occurs






32. 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?






33. Is erasing the plate signal






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






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






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






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






38. 2 eV - which is necessary to energize the trapped electrons.






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






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






41. What does pixel size determine






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






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






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






45. Improves image contrast






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






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






48. What steps are included in 'readout processing






49. Improves visualization and spatial resolution






50. 0.1 mR up to maximum of 100 mR