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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. Holds the Photostimulable phosphor (PSP) - which is the active component in the plate.
Pixel shift
Reflective layer
Phosphor or Active layer
Color layer
2. Processes for amplitude - scale and compression - Shapes the signal before the final image is formed
Computer Control functions
100-200 micrometers
Amplification and conversion to digital image
Third step of PSL
3. Improves image contrast
Subtraction (DSA)
Window and level
Beam-shaping optics
Image flip and image inversion
4. Number related to the amount of amplification required by the PM tube to adjust the digital image.
Postprocessing
S number
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
5. How many 'bits' does the typical CR system have?
Window and level
Reflective layer
Final step of PSL
10 - 12 - 16
6. Detect (read) the stimulated emission
Laser scanning; Conversion to analog signal.
Third step of PSL
Window and level
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
7. 0.1 mR up to maximum of 100 mR
Light-collecting optics
Third step of PSL
Exposure sensitivity of the imaging plate ranges from
Magnification
8. The material in this layer absorbs and reduces static electricity
Color layer
Postprocessing
Laser scanning; Conversion to analog signal.
Conductive layer
9. Performed to optimize the appearance of the image for purpose of better detecting pathology
Postprocessing
Light-collecting optics
Light-collecting optics
Light shield layer
10. What is the typical pixel size?
Conductive layer
100-200 micrometers
The more pixels
Support layer
11. The CR cassettes - phosphor plates - and CR reader.
Beam-shaping optics
Postprocessing
Laser scanning; Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast sensitivity
The use of CR requires
12. Defined as light produced by a phosphor (active layer) when struck by light or x-ray photons.
Backing layer
The most common phosphor with characteristics favorable for CR is...
Subtraction (DSA)
Photostimulable Luminescence (PSL
13. Barium fluorohalide bromides and iodides with europium activators (BaFBr:Eu and BaFI:Eu)
Spatial resolution
`The laser light is emitted at approximately
The most common phosphor with characteristics favorable for CR is...
Conductor layer
14. In what step is an amplifier used to match the PMT output signal to the ADC values?
The most common phosphor with characteristics favorable for CR is...
Color layer
Postprocessing
Amplification and conversion to digital image
15. Prevents light from erasing data on the imaging plate or leaking through the backing - degreasing the spatial resolution.
Light shield layer
the Laser
10 - 12 - 16
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
16. Keeps the laser beam constant size - shape - speed and intensity
The most common phosphor with characteristics favorable for CR is...
Beam-shaping optics
Spatial resolution
Conductor layer
17. How many 'bits' does the typical CR system have?
10 - 12 - 16
Final step of PSL
Conductor layer
Final step of PSL
18. 2 eV - which is necessary to energize the trapped electrons.
Photodetector
Protective layer
`The laser light is emitted at approximately
Subtraction (DSA)
19. What is the typical pixel size?
Beam-shaping optics
100-200 micrometers
Subtraction (DSA)
S number
20. Expands the digital grayscale to visible
the Laser
Image flip and image inversion
Optical filters
Window and level
21. A very thin - tough - clear plastic that protects the phosphor layer
Protective layer
S number
Conductor layer
Subtraction (DSA)
22. Detect (read) the stimulated emission
Backing layer
S number
The most common phosphor with characteristics favorable for CR is...
Third step of PSL
23. Labeling the image
Annotation
Reflective layer
Typical number of pixels in a matrix ranges from
Laser scanning; Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast sensitivity
24. Cassette-based digital imaging is the digital acquisition modality that uses storage phosphor plates to produce projection images
Computed Radiography
Postprocessing
Protective layer
The more pixels
25. A semi-rigid material that gives the imaging sheet some strength and a base on which to coat the other layers.
Backing layer
Magnification
Light shield layer
Support layer
26. Receives light from the fiber optic collection assembly - and transmits a time-varying analog signal to a computer system
Subtraction (DSA)
Support layer
Photodetector
The most common phosphor with characteristics favorable for CR is...
27. Registering the image to correct for patient motion
Photodetector
Pixel shift
Conductive layer
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.
The more pixels
Protective layer
Pixel shift
Reflective layer
29. Filters the light before photodetection occurs
Optical filters
Beam-shaping optics
First step of PSL
Protective layer
30. Holds the Photostimulable phosphor (PSP) - which is the active component in the plate.
`The laser light is emitted at approximately
Phosphor or Active layer
Pixel shift
Exposure sensitivity of the imaging plate ranges from
31. A soft polymer that protects the back of the cassette.
Backing layer
Second step of PSL
Color layer
Magnification
32. A very thin - tough - clear plastic that protects the phosphor layer
Protective layer
The use of CR requires
Photostimulable Luminescence (PSL
Second step of PSL
33. Improves image contrast
Subtraction (DSA)
`The laser light is emitted at approximately
First step of PSL
Amplification and conversion to digital image
34. Processes for amplitude - scale and compression - Shapes the signal before the final image is formed
the Laser
Computer Control functions
Protective layer
Exposure sensitivity of the imaging plate ranges from
35. Keeps the laser beam constant size - shape - speed and intensity
Computer Control functions
Magnification
Light shield layer
Beam-shaping optics
36. Grounds the plate to eliminate electrostatic problems and absorb light to increase sharpness
Reflective layer
Light shield layer
Conductor layer
Exposure sensitivity of the imaging plate ranges from
37. 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
Typical number of pixels in a matrix ranges from
Magnification
Conductive layer
the Laser
38. 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.
Exposure sensitivity of the imaging plate ranges from
`The laser light is emitted at approximately
Window and level
39. Cassette-based digital imaging is the digital acquisition modality that uses storage phosphor plates to produce projection images
Photostimulable Luminescence (PSL
The more pixels
Subtraction (DSA)
Computed Radiography
40. What are the steps in Computed Radiography Image Processing?
Annotation
The more pixels
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
Region of Interest (ROI)
41. A finely focused beam of infrared light with wavelength and beam diameter of 50 to 100 nm is directed at the PSP.
Third step of PSL
Photodetector
Second step of PSL
Region of Interest (ROI)
42. Improves visualization and spatial resolution
Magnification
Conductive layer
Third step of PSL
The use of CR requires
43. 0.1 mR up to maximum of 100 mR
Light shield layer
Photodetector
Backing layer
Exposure sensitivity of the imaging plate ranges from
44. From 512 x 512 to 1024 x 1024 for CT - but can be as large as 2500 x 2500 for radiography.
The more pixels
10 - 12 - 16
Typical number of pixels in a matrix ranges from
Postprocessing
45. Performed to optimize the appearance of the image for purpose of better detecting pathology
Subtraction (DSA)
Phosphor or Active layer
100-200 micrometers
Postprocessing
46. From 512 x 512 to 1024 x 1024 for CT - but can be as large as 2500 x 2500 for radiography.
Typical number of pixels in a matrix ranges from
Photostimulable Luminescence (PSL
Window and level
Pixel shift
47. In what step is an amplifier used to match the PMT output signal to the ADC values?
The most common phosphor with characteristics favorable for CR is...
Protective layer
Amplification and conversion to digital image
Computer Control functions
48. Determines average pixel value in quantitative imaging
Photodetector
Region of Interest (ROI)
Optical filters
Exposure sensitivity of the imaging plate ranges from
49. Prevents light from erasing data on the imaging plate or leaking through the backing - degreasing the spatial resolution.
Light shield layer
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
Optical filters
Postprocessing
50. 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?
Optical filters
Laser scanning; Conversion to analog signal.
The more pixels
Region of Interest (ROI)