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. 0.1 mR up to maximum of 100 mR






2. Expands the digital grayscale to visible






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






4. Determines average pixel value in quantitative imaging






5. What is the typical pixel size?






6. What does pixel size determine






7. Detect (read) the stimulated emission






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






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






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






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






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






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






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






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






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






17. Registering the image to correct for patient motion






18. Improves image contrast






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






20. Expands the digital grayscale to visible






21. Is erasing the plate signal






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






23. 2 eV - which is necessary to energize the trapped electrons.






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






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






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






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






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






29. What does pixel size determine






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






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






32. 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?






33. Improves image contrast






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






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






36. 0.1 mR up to maximum of 100 mR






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






38. Labeling the image






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






40. What steps are included in 'readout processing






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






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






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






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






45. Improves visualization and spatial resolution






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






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






49. 2 eV - which is necessary to energize the trapped electrons.






50. Filters the light before photodetection occurs