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