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






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






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






5. 2 eV - which is necessary to energize the trapped electrons.






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






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






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






9. Detect (read) the stimulated emission






10. Labeling the image






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






12. 0.1 mR up to maximum of 100 mR






13. Improves visualization and spatial resolution






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






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






16. What is the typical pixel size?






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






18. What does pixel size determine






19. Expands the digital grayscale to visible






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






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






22. What steps are included in 'readout processing






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






24. What steps are included in 'readout processing






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






26. Registering the image to correct for patient motion






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






28. 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






29. Improves image contrast






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






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






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






33. What is the typical pixel size?






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






35. Filters the light before photodetection occurs






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






37. 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






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






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






40. 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






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






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






43. 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?






44. Labeling the image






45. 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?






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






47. 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.






48. 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






49. The greater the spatial image resolution.






50. Improves visualization and spatial resolution