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






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






3. 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






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






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






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






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






8. Detect (read) the stimulated emission






9. 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






10. Improves visualization and spatial resolution






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






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






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






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






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






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






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






18. Labeling the image






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






20. 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?






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






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






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






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






26. 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






27. Registering the image to correct for patient motion






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






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






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






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






32. Improves image contrast






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






34. 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?






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






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






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






38. 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.






39. What does pixel size determine






40. Is erasing the plate signal






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






42. Expands the digital grayscale to visible






43. What is the typical pixel size?






44. The greater the spatial image resolution.






45. Filters the light before photodetection occurs






46. Determines average pixel value in quantitative imaging






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






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






49. 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






50. 0.1 mR up to maximum of 100 mR