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. 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






2. What is the typical pixel size?






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






4. 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.






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






6. Improves visualization and spatial resolution






7. 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?






8. Expands the digital grayscale to visible






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






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






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






12. Improves image contrast






13. 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.






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






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






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






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






18. Improves image contrast






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






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






21. Filters the light before photodetection occurs






22. 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?






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






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






25. Is erasing the plate signal






26. What is the typical pixel size?






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






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






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






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






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






32. 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






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






34. Determines average pixel value in quantitative imaging






35. Registering the image to correct for patient motion






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






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






38. 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






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






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






41. Registering the image to correct for patient motion






42. What does pixel size determine






43. Filters the light before photodetection occurs






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






45. Expands the digital grayscale to visible






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






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






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






49. Improves visualization and spatial resolution






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