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