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Test your basic knowledge |
Digital Imaging Basics
Start Test
Study First
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. Processes for amplitude - scale and compression - Shapes the signal before the final image is formed
Computer Control functions
10 - 12 - 16
Photodetector
The use of CR requires
2. Processes for amplitude - scale and compression - Shapes the signal before the final image is formed
`The laser light is emitted at approximately
Magnification
10 - 12 - 16
Computer Control functions
3. Improves image contrast
Computed Radiography
Conductor layer
Image flip and image inversion
Subtraction (DSA)
4. Grounds the plate to eliminate electrostatic problems and absorb light to increase sharpness
Conductor layer
Postprocessing
Spatial resolution
Third step of PSL
5. Expands the digital grayscale to visible
Computer Control functions
Window and level
Beam-shaping optics
Computed Radiography
6. Labeling the image
First step of PSL
Subtraction (DSA)
Protective layer
Annotation
7. X-ray beam exposes a PSP - the energy transfer results in excitation of electron into a metastable state.
S number
Subtraction (DSA)
100-200 micrometers
First step of PSL
8. Keeps the laser beam constant size - shape - speed and intensity
Optical filters
Beam-shaping optics
Subtraction (DSA)
Laser scanning; Conversion to analog signal.
9. Improves visualization and spatial resolution
Subtraction (DSA)
Pixel shift
Computed Radiography
Magnification
10. Registering the image to correct for patient motion
Protective layer
The most common phosphor with characteristics favorable for CR is...
Window and level
Pixel shift
11. 2 eV - which is necessary to energize the trapped electrons.
Conductor layer
Typical number of pixels in a matrix ranges from
Conductive layer
`The laser light is emitted at approximately
12. From 512 x 512 to 1024 x 1024 for CT - but can be as large as 2500 x 2500 for radiography.
Annotation
Optical filters
First step of PSL
Typical number of pixels in a matrix ranges from
13. 2 eV - which is necessary to energize the trapped electrons.
Laser scanning; Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast sensitivity
The most common phosphor with characteristics favorable for CR is...
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
`The laser light is emitted at approximately
14. Is erasing the plate signal
The most common phosphor with characteristics favorable for CR is...
Final step of PSL
Subtraction (DSA)
Color layer
15. What are the steps in Computed Radiography Image Processing?
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
Backing layer
Amplification and conversion to digital image
Window and level
16. Cassette-based digital imaging is the digital acquisition modality that uses storage phosphor plates to produce projection images
Conductor layer
Computer Control functions
Computed Radiography
Region of Interest (ROI)
17. Holds the Photostimulable phosphor (PSP) - which is the active component in the plate.
Spatial resolution
Conductive layer
Photodetector
Phosphor or Active layer
18. A soft polymer that protects the back of the cassette.
Light shield layer
Backing layer
Final step of PSL
Laser scanning; Conversion to analog signal.
19. The greater the spatial image resolution.
Laser scanning; Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast sensitivity
Backing layer
Pixel shift
The more pixels
20. The material in this layer absorbs and reduces static electricity
Window and level
Conductive layer
Support layer
The most common phosphor with characteristics favorable for CR is...
21. Is erasing the plate signal
Annotation
Final step of PSL
100-200 micrometers
The use of CR requires
22. What does pixel size determine
Color layer
Spatial resolution
Protective layer
Phosphor or Active layer
23. Located between the active and support layers if the IP that absorbs the stimulating light but reflects emitted light. (for newer plates)
Color layer
Backing layer
Photostimulable Luminescence (PSL
Second step of PSL
24. Defined as light produced by a phosphor (active layer) when struck by light or x-ray photons.
Typical number of pixels in a matrix ranges from
Computer Control functions
Magnification
Photostimulable Luminescence (PSL
25. Barium fluorohalide bromides and iodides with europium activators (BaFBr:Eu and BaFI:Eu)
Pixel shift
Beam-shaping optics
The most common phosphor with characteristics favorable for CR is...
Backing layer
26. Located between the active and support layers if the IP that absorbs the stimulating light but reflects emitted light. (for newer plates)
Optical filters
Color layer
Photostimulable Luminescence (PSL
Photostimulable Luminescence (PSL
27. Number related to the amount of amplification required by the PM tube to adjust the digital image.
S number
Region of Interest (ROI)
Third step of PSL
10 - 12 - 16
28. 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.
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
Reflective layer
100-200 micrometers
Typical number of pixels in a matrix ranges from
29. Reorients image presentation and makes white black and black white
Image flip and image inversion
Magnification
Computed Radiography
Third step of PSL
30. Receives light from the fiber optic collection assembly - and transmits a time-varying analog signal to a computer system
Conductive layer
Region of Interest (ROI)
`The laser light is emitted at approximately
Photodetector
31. Number related to the amount of amplification required by the PM tube to adjust the digital image.
Image flip and image inversion
Laser scanning; Conversion to analog signal.
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
S number
32. Barium fluorohalide bromides and iodides with europium activators (BaFBr:Eu and BaFI:Eu)
The most common phosphor with characteristics favorable for CR is...
Beam-shaping optics
100-200 micrometers
`The laser light is emitted at approximately
33. A finely focused beam of infrared light with wavelength and beam diameter of 50 to 100 nm is directed at the PSP.
`The laser light is emitted at approximately
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
Photostimulable Luminescence (PSL
Second step of PSL
34. A finely focused beam of infrared light with wavelength and beam diameter of 50 to 100 nm is directed at the PSP.
Second step of PSL
`The laser light is emitted at approximately
Conductor layer
Optical filters
35. Labeling the image
Photostimulable Luminescence (PSL
Annotation
the Laser
Computer Control functions
36. Determines average pixel value in quantitative imaging
Region of Interest (ROI)
First step of PSL
Window and level
Subtraction (DSA)
37. Performed to optimize the appearance of the image for purpose of better detecting pathology
Postprocessing
Beam-shaping optics
Photostimulable Luminescence (PSL
Color layer
38. Grounds the plate to eliminate electrostatic problems and absorb light to increase sharpness
Color layer
Second step of PSL
Conductor layer
Conductive layer
39. Determines average pixel value in quantitative imaging
Magnification
Support layer
Region of Interest (ROI)
Annotation
40. Filters the light before photodetection occurs
Region of Interest (ROI)
Beam-shaping optics
Optical filters
Laser scanning; Conversion to analog signal.
41. Receives light from the fiber optic collection assembly - and transmits a time-varying analog signal to a computer system
Image flip and image inversion
100-200 micrometers
Color layer
Photodetector
42. 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
the Laser
Spatial resolution
Typical number of pixels in a matrix ranges from
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
43. 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?
Light shield layer
Optical filters
Laser scanning; Conversion to analog signal.
Photostimulable Luminescence (PSL
44. What are the steps in Computed Radiography Image Processing?
Reflective layer
Computed Radiography
First step of PSL
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
45. What is the typical pixel size?
100-200 micrometers
Laser scanning; Conversion to analog signal.
Typical number of pixels in a matrix ranges from
Reflective layer
46. In what step is an amplifier used to match the PMT output signal to the ADC values?
Support layer
S number
Annotation
Amplification and conversion to digital image
47. The material in this layer absorbs and reduces static electricity
Conductive layer
Typical number of pixels in a matrix ranges from
Postprocessing
Conductor layer
48. Improves image contrast
Image flip and image inversion
Second step of PSL
Subtraction (DSA)
Laser scanning; Conversion to analog signal.
49. What steps are included in 'readout processing
Laser scanning; Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast sensitivity
Spatial resolution
Annotation
Phosphor or Active layer
50. 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
the Laser
Light shield layer
Subtraction (DSA)
Final step of PSL