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. Is erasing the plate signal






2. 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?






3. Detect (read) the stimulated emission






4. 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?






5. 0.1 mR up to maximum of 100 mR






6. Registering the image to correct for patient motion






7. The greater the spatial image resolution.






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






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






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






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






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






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






14. 2 eV - which is necessary to energize the trapped electrons.






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






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






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






18. Labeling the image






19. What is the typical pixel size?






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






21. Is erasing the plate signal






22. What does pixel size determine






23. Improves visualization and spatial resolution






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






25. 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






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






27. Labeling the image






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






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






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






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






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






33. 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






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






35. What steps are included in 'readout processing






36. What steps are included in 'readout processing






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






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






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






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






41. What is the typical pixel size?






42. Determines average pixel value in quantitative imaging






43. Filters the light before photodetection occurs






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






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






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






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






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






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






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