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