Test your basic knowledge |

Digital Imaging Basics

Subject : engineering
Instructions:
  • Answer 50 questions in 15 minutes.
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  • 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. 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






2. Filters the light before photodetection occurs






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






4. Holds the Photostimulable phosphor (PSP) - which is the active component in the plate.






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






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






7. Expands the digital grayscale to visible






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






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






10. Filters the light before photodetection occurs






11. What steps are included in 'readout processing






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






13. Detect (read) the stimulated emission






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






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






16. 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.






17. What steps are included in 'readout processing






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






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






20. Holds the Photostimulable phosphor (PSP) - which is the active component in the plate.






21. Determines average pixel value in quantitative imaging






22. 2 eV - which is necessary to energize the trapped electrons.






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






24. Is erasing the plate signal






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






26. 0.1 mR up to maximum of 100 mR






27. The greater the spatial image resolution.






28. What is the typical pixel size?






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






30. 2 eV - which is necessary to energize the trapped electrons.






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






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






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






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






35. Expands the digital grayscale to visible






36. Registering the image to correct for patient motion






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






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






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






40. Detect (read) the stimulated emission






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






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






43. 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






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






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






46. What does pixel size determine






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






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






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






50. What is the typical pixel size?