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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. 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
The most common phosphor with characteristics favorable for CR is...
`The laser light is emitted at approximately
Computed Radiography
Light-collecting optics
2. The greater the spatial image resolution.
Subtraction (DSA)
The more pixels
Light shield layer
S number
3. Barium fluorohalide bromides and iodides with europium activators (BaFBr:Eu and BaFI:Eu)
Image flip and image inversion
Light shield layer
Subtraction (DSA)
The most common phosphor with characteristics favorable for CR is...
4. Improves visualization and spatial resolution
Reflective layer
Magnification
Phosphor or Active layer
The use of CR requires
5. From 512 x 512 to 1024 x 1024 for CT - but can be as large as 2500 x 2500 for radiography.
First step of PSL
Backing layer
Light shield layer
Typical number of pixels in a matrix ranges from
6. How many 'bits' does the typical CR system have?
Image flip and image inversion
Third step of PSL
Second step of PSL
10 - 12 - 16
7. A very thin - tough - clear plastic that protects the phosphor layer
Protective layer
Light-collecting optics
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
Color layer
8. Number related to the amount of amplification required by the PM tube to adjust the digital image.
the Laser
Subtraction (DSA)
Beam-shaping optics
S number
9. Determines average pixel value in quantitative imaging
100-200 micrometers
Region of Interest (ROI)
The more pixels
the Laser
10. Is erasing the plate signal
Window and level
S number
Exposure sensitivity of the imaging plate ranges from
Final step of PSL
11. Keeps the laser beam constant size - shape - speed and intensity
Computer Control functions
Optical filters
Beam-shaping optics
Typical number of pixels in a matrix ranges from
12. 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
Magnification
The most common phosphor with characteristics favorable for CR is...
13. Prevents light from erasing data on the imaging plate or leaking through the backing - degreasing the spatial resolution.
Subtraction (DSA)
Light shield layer
The use of CR requires
Optical filters
14. Cassette-based digital imaging is the digital acquisition modality that uses storage phosphor plates to produce projection images
Laser scanning; Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast sensitivity
Optical filters
Conductor layer
Computed Radiography
15. Detect (read) the stimulated emission
The use of CR requires
Color layer
Third step of PSL
Backing layer
16. Detect (read) the stimulated emission
Light-collecting optics
Third step of PSL
Exposure sensitivity of the imaging plate ranges from
`The laser light is emitted at approximately
17. Performed to optimize the appearance of the image for purpose of better detecting pathology
`The laser light is emitted at approximately
Image flip and image inversion
Laser scanning; Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast sensitivity
Postprocessing
18. The material in this layer absorbs and reduces static electricity
Window and level
Phosphor or Active layer
Conductive layer
The more pixels
19. Is erasing the plate signal
`The laser light is emitted at approximately
Optical filters
First step of PSL
Final step of PSL
20. Defined as light produced by a phosphor (active layer) when struck by light or x-ray photons.
Second step of PSL
Photostimulable Luminescence (PSL
Photodetector
the Laser
21. A semi-rigid material that gives the imaging sheet some strength and a base on which to coat the other layers.
Reflective layer
Support layer
Second step of PSL
Protective layer
22. What steps are included in 'readout processing
Computer Control functions
Magnification
Laser scanning; Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast sensitivity
Pixel shift
23. Grounds the plate to eliminate electrostatic problems and absorb light to increase sharpness
The more pixels
Final step of PSL
Conductor layer
Laser scanning; Conversion to analog signal.
24. Holds the Photostimulable phosphor (PSP) - which is the active component in the plate.
The more pixels
Phosphor or Active layer
Annotation
100-200 micrometers
25. Cassette-based digital imaging is the digital acquisition modality that uses storage phosphor plates to produce projection images
Support layer
Light-collecting optics
Computed Radiography
Photostimulable Luminescence (PSL
26. Grounds the plate to eliminate electrostatic problems and absorb light to increase sharpness
Conductor layer
Light-collecting optics
Light shield layer
the Laser
27. Improves visualization and spatial resolution
Light shield layer
Magnification
The most common phosphor with characteristics favorable for CR is...
Conductive layer
28. 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?
Backing layer
Beam-shaping optics
Laser scanning; Conversion to analog signal.
Region of Interest (ROI)
29. Keeps the laser beam constant size - shape - speed and intensity
Beam-shaping optics
Light shield layer
10 - 12 - 16
Subtraction (DSA)
30. Processes for amplitude - scale and compression - Shapes the signal before the final image is formed
Final step of PSL
The most common phosphor with characteristics favorable for CR is...
Computer Control functions
Magnification
31. Reorients image presentation and makes white black and black white
Postprocessing
First step of PSL
Image flip and image inversion
Protective layer
32. What are the steps in Computed Radiography Image Processing?
Region of Interest (ROI)
Subtraction (DSA)
Magnification
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
33. What does pixel size determine
Spatial resolution
Conductor layer
Laser scanning; Conversion to analog signal.
Backing layer
34. The material in this layer absorbs and reduces static electricity
Conductive layer
S number
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
Amplification and conversion to digital image
35. Improves image contrast
Magnification
Subtraction (DSA)
Typical number of pixels in a matrix ranges from
Support layer
36. 2 eV - which is necessary to energize the trapped electrons.
The most common phosphor with characteristics favorable for CR is...
Conductor layer
`The laser light is emitted at approximately
Postprocessing
37. Expands the digital grayscale to visible
`The laser light is emitted at approximately
Reflective layer
Computer Control functions
Window and level
38. 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.
Reflective layer
Phosphor or Active layer
10 - 12 - 16
Support layer
39. A very thin - tough - clear plastic that protects the phosphor layer
Support layer
Protective layer
Phosphor or Active layer
10 - 12 - 16
40. 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.
Annotation
Reflective layer
Exposure sensitivity of the imaging plate ranges from
Light shield layer
41. Receives light from the fiber optic collection assembly - and transmits a time-varying analog signal to a computer system
Postprocessing
The most common phosphor with characteristics favorable for CR is...
Photodetector
Phosphor or Active layer
42. Reorients image presentation and makes white black and black white
Reflective layer
Image flip and image inversion
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
Optical filters
43. Barium fluorohalide bromides and iodides with europium activators (BaFBr:Eu and BaFI:Eu)
The most common phosphor with characteristics favorable for CR is...
The more pixels
Final step of PSL
Annotation
44. 0.1 mR up to maximum of 100 mR
Second step of PSL
Annotation
Photodetector
Exposure sensitivity of the imaging plate ranges from
45. X-ray beam exposes a PSP - the energy transfer results in excitation of electron into a metastable state.
Annotation
Postprocessing
First step of PSL
Image flip and image inversion
46. Registering the image to correct for patient motion
Conductive layer
Pixel shift
Computer Control functions
The more pixels
47. What is the typical pixel size?
100-200 micrometers
Conductive layer
Light-collecting optics
Laser scanning; Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast sensitivity
48. Registering the image to correct for patient motion
Pixel shift
Spatial resolution
Region of Interest (ROI)
Light-collecting optics
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
the Laser
Computer Control functions
Optical filters
Light-collecting optics
50. Receives light from the fiber optic collection assembly - and transmits a time-varying analog signal to a computer system
Photodetector
First step of PSL
Light shield layer
Reflective layer