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. Labeling the image






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






3. Labeling the image






4. The greater the spatial image resolution.






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






6. What is the typical pixel size?






7. Registering the image to correct for patient motion






8. 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?






9. What is the typical pixel size?






10. 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






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






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






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






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






15. Improves visualization and spatial resolution






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






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






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






19. 0.1 mR up to maximum of 100 mR






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






21. 2 eV - which is necessary to energize the trapped electrons.






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






23. 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.






24. The greater the spatial image resolution.






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






27. Filters the light before photodetection occurs






28. Determines average pixel value in quantitative imaging






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






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






31. What steps are included in 'readout processing






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






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






34. Registering the image to correct for patient motion






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






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






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






38. 0.1 mR up to maximum of 100 mR






39. 2 eV - which is necessary to energize the trapped electrons.






40. Determines average pixel value in quantitative imaging






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






42. Detect (read) the stimulated emission






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






44. Filters the light before photodetection occurs






45. Is erasing the plate signal






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






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






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






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






50. 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