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. 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.






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






4. 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






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






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






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






8. 0.1 mR up to maximum of 100 mR






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






10. Registering the image to correct for patient motion






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






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






13. Labeling the image






14. What is the typical pixel size?






15. What is the typical pixel size?






16. Is erasing the plate signal






17. Determines average pixel value in quantitative imaging






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






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






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






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






22. Is erasing the plate signal






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






24. Determines average pixel value in quantitative imaging






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






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






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






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






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






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






31. What does pixel size determine






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






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






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






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






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






37. Improves image contrast






38. Detect (read) the stimulated emission






39. Detect (read) the stimulated emission






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






41. Filters the light before photodetection occurs






42. 2 eV - which is necessary to energize the trapped electrons.






43. 0.1 mR up to maximum of 100 mR






44. Labeling the image






45. Filters the light before photodetection occurs






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






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






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






49. What steps are included in 'readout processing






50. The greater the spatial image resolution.