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. The material in this layer absorbs and reduces static electricity






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






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






4. The greater the spatial image resolution.






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






6. 2 eV - which is necessary to energize the trapped electrons.






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






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






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






10. The greater the spatial image resolution.






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






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






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






14. What does pixel size determine






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






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






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






18. Registering the image to correct for patient motion






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






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






21. What steps are included in 'readout processing






22. Detect (read) the stimulated emission






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






24. Determines average pixel value in quantitative imaging






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






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






27. 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.






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






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






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






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






32. Is erasing the plate signal






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






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






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






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






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






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






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






40. Detect (read) the stimulated emission






41. 2 eV - which is necessary to energize the trapped electrons.






42. Improves image contrast






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






44. Is erasing the plate signal






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






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






47. 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






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






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






50. Filters the light before photodetection occurs