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. Expands the digital grayscale to visible






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






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






4. What does pixel size determine






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






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






7. Determines average pixel value in quantitative imaging






8. Determines average pixel value in quantitative imaging






9. 0.1 mR up to maximum of 100 mR






10. 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






11. 2 eV - which is necessary to energize the trapped electrons.






12. Detect (read) the stimulated emission






13. 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






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






15. Improves visualization and spatial resolution






16. What is the typical pixel size?






17. 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.






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






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






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






21. The greater the spatial image resolution.






22. What does pixel size determine






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






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






25. Is erasing the plate signal






26. 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.






27. What steps are included in 'readout processing






28. Registering the image to correct for patient motion






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






30. Improves visualization and spatial resolution






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






32. What is the typical pixel size?






33. Filters the light before photodetection occurs






34. Labeling the image






35. Improves image contrast






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






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






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






40. Registering the image to correct for patient motion






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






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






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






44. 2 eV - which is necessary to energize the trapped electrons.






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






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






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






48. 0.1 mR up to maximum of 100 mR






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






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