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. 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






2. The greater the spatial image resolution.






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






4. Improves visualization and spatial resolution






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






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






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






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






9. Determines average pixel value in quantitative imaging






10. Is erasing the plate signal






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






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






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






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






15. Detect (read) the stimulated emission






16. Detect (read) the stimulated emission






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






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






19. Is erasing the plate signal






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






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






22. What steps are included in 'readout processing






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






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






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






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






27. Improves visualization and spatial resolution






28. 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?






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






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






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






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






33. What does pixel size determine






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






35. Improves image contrast






36. 2 eV - which is necessary to energize the trapped electrons.






37. Expands the digital grayscale to visible






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






40. 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.






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






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






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






44. 0.1 mR up to maximum of 100 mR






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






46. Registering the image to correct for patient motion






47. What is the typical pixel size?






48. Registering the image to correct for patient motion






49. 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






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