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






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






3. 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






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






5. Labeling the image






6. 0.1 mR up to maximum of 100 mR






7. Filters the light before photodetection occurs






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






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






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






11. What does pixel size determine






12. Expands the digital grayscale to visible






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






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






15. 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?






16. 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?






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






18. Detect (read) the stimulated emission






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






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






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






22. 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.






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






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






25. The greater the spatial image resolution.






26. Improves image contrast






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






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






29. Improves image contrast






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






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






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






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






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






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






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






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






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






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






40. 0.1 mR up to maximum of 100 mR






41. 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






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






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






44. Improves visualization and spatial resolution






45. What is the typical pixel size?






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






47. What steps are included in 'readout processing






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






49. 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






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






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