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