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. Filters the light before photodetection occurs






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






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






4. Improves image contrast






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






6. Labeling the image






7. What does pixel size determine






8. Improves image contrast






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






10. What is the typical pixel size?






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






12. The greater the spatial image resolution.






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






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






15. Expands the digital grayscale to visible






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






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






18. Labeling the image






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






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






21. Determines average pixel value in quantitative imaging






22. Registering the image to correct for patient motion






23. Determines average pixel value in quantitative imaging






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






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






26. Registering the image to correct for patient motion






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






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. 0.1 mR up to maximum of 100 mR






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






31. Detect (read) the stimulated emission






32. Is erasing the plate signal






33. 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






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






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






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






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






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






39. 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






40. What steps are included in 'readout processing






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






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






43. Improves visualization and spatial resolution






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






45. 0.1 mR up to maximum of 100 mR






46. Filters the light before photodetection occurs






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






48. 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.






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






50. 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