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






2. 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






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






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






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






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






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






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






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






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






11. What steps are included in 'readout processing






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






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






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






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






16. Detect (read) the stimulated emission






17. 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






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






19. Detect (read) the stimulated emission






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






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






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






23. Improves image contrast






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






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






26. The greater the spatial image resolution.






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






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






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






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






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






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






34. What is the typical pixel size?






35. Determines average pixel value in quantitative imaging






36. Expands the digital grayscale to visible






37. 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.






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






39. Filters the light before photodetection occurs






40. Registering the image to correct for patient motion






41. 0.1 mR up to maximum of 100 mR






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






43. What does pixel size determine






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






45. What steps are included in 'readout processing






46. Improves visualization and spatial resolution






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






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






49. Expands the digital grayscale to visible






50. 2 eV - which is necessary to energize the trapped electrons.