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. Improves image contrast






3. 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






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






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






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






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






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






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






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






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






12. 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.






13. The greater the spatial image resolution.






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






15. 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






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






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






18. 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.






19. 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






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






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






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






23. Is erasing the plate signal






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






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






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






27. Determines average pixel value in quantitative imaging






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






29. Detect (read) the stimulated emission






30. Registering the image to correct for patient motion






31. Registering the image to correct for patient motion






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






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






34. 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






35. 2 eV - which is necessary to energize the trapped electrons.






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






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






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






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






40. Improves image contrast






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






42. Improves visualization and spatial resolution






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






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






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






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






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






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






49. Filters the light before photodetection occurs






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