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






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






3. Improves image contrast






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






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






6. Detect (read) the stimulated emission






7. 0.1 mR up to maximum of 100 mR






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






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






10. What is the typical pixel size?






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






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






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






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






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






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






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






18. 2 eV - which is necessary to energize the trapped electrons.






19. What is the typical pixel size?






20. Expands the digital grayscale to visible






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






22. Detect (read) the stimulated emission






23. Labeling the image






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






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






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






27. Registering the image to correct for patient motion






28. 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.






29. Filters the light before photodetection occurs






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






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






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






33. Improves image contrast






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






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






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






37. 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






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






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






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






41. A finely focused beam of infrared light with wavelength and beam diameter of 50 to 100 nm is directed at the PSP.






42. Improves visualization and spatial resolution






43. 0.1 mR up to maximum of 100 mR






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






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






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






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






48. Determines average pixel value in quantitative imaging






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






50. 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?