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