SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
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. 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?
Support layer
Beam-shaping optics
Phosphor or Active layer
Laser scanning; Conversion to analog signal.
2. 2 eV - which is necessary to energize the trapped electrons.
The more pixels
Reflective layer
Subtraction (DSA)
`The laser light is emitted at approximately
3. Detect (read) the stimulated emission
Final step of PSL
Third step of PSL
Typical number of pixels in a matrix ranges from
Conductive layer
4. 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
Light-collecting optics
Reflective layer
Subtraction (DSA)
5. Receives light from the fiber optic collection assembly - and transmits a time-varying analog signal to a computer system
Photodetector
Postprocessing
`The laser light is emitted at approximately
The most common phosphor with characteristics favorable for CR is...
6. Expands the digital grayscale to visible
Color layer
The most common phosphor with characteristics favorable for CR is...
Optical filters
Window and level
7. The material in this layer absorbs and reduces static electricity
Protective layer
Conductive layer
Photostimulable Luminescence (PSL
Window and level
8. A very thin - tough - clear plastic that protects the phosphor layer
Protective layer
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
Amplification and conversion to digital image
Laser scanning; Conversion to analog signal.
9. 0.1 mR up to maximum of 100 mR
Exposure sensitivity of the imaging plate ranges from
Computed Radiography
Protective layer
Image flip and image inversion
10. From 512 x 512 to 1024 x 1024 for CT - but can be as large as 2500 x 2500 for radiography.
Conductor layer
Typical number of pixels in a matrix ranges from
Light-collecting optics
Final step of PSL
11. Defined as light produced by a phosphor (active layer) when struck by light or x-ray photons.
Photostimulable Luminescence (PSL
Pixel shift
The most common phosphor with characteristics favorable for CR is...
Subtraction (DSA)
12. Keeps the laser beam constant size - shape - speed and intensity
10 - 12 - 16
Amplification and conversion to digital image
The most common phosphor with characteristics favorable for CR is...
Beam-shaping optics
13. A soft polymer that protects the back of the cassette.
Annotation
Photodetector
Image flip and image inversion
Backing layer
14. 0.1 mR up to maximum of 100 mR
Second step of PSL
Exposure sensitivity of the imaging plate ranges from
Conductive layer
Protective layer
15. Number related to the amount of amplification required by the PM tube to adjust the digital image.
Typical number of pixels in a matrix ranges from
The more pixels
S number
Laser scanning; Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast sensitivity
16. 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.
The more pixels
Subtraction (DSA)
Computer Control functions
17. What is the typical pixel size?
Reflective layer
100-200 micrometers
Region of Interest (ROI)
The most common phosphor with characteristics favorable for CR is...
18. Processes for amplitude - scale and compression - Shapes the signal before the final image is formed
Amplification and conversion to digital image
The use of CR requires
Computer Control functions
Laser scanning; Conversion to analog signal.
19. Filters the light before photodetection occurs
Annotation
Laser scanning; Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast sensitivity
Optical filters
Conductive layer
20. In what step is an amplifier used to match the PMT output signal to the ADC values?
100-200 micrometers
Amplification and conversion to digital image
S number
Annotation
21. Grounds the plate to eliminate electrostatic problems and absorb light to increase sharpness
Conductor layer
Second step of PSL
Spatial resolution
Light-collecting optics
22. Barium fluorohalide bromides and iodides with europium activators (BaFBr:Eu and BaFI:Eu)
Second step of PSL
S number
Reflective layer
The most common phosphor with characteristics favorable for CR is...
23. Registering the image to correct for patient motion
Laser scanning; Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast sensitivity
Image flip and image inversion
Second step of PSL
Pixel shift
24. X-ray beam exposes a PSP - the energy transfer results in excitation of electron into a metastable state.
Light-collecting optics
Pixel shift
First step of PSL
`The laser light is emitted at approximately
25. 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
Optical filters
Light-collecting optics
10 - 12 - 16
Subtraction (DSA)
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.
Computed Radiography
Window and level
Reflective layer
Third step of PSL
27. How many 'bits' does the typical CR system have?
Postprocessing
Laser scanning; Conversion to analog signal.
10 - 12 - 16
Spatial resolution
28. Is erasing the plate signal
Optical filters
Final step of PSL
Typical number of pixels in a matrix ranges from
Laser scanning; Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast sensitivity
29. What does pixel size determine
100-200 micrometers
Reflective layer
Second step of PSL
Spatial resolution
30. Reorients image presentation and makes white black and black white
Color layer
The more pixels
Image flip and image inversion
Final step of PSL
31. Barium fluorohalide bromides and iodides with europium activators (BaFBr:Eu and BaFI:Eu)
Third step of PSL
The most common phosphor with characteristics favorable for CR is...
The use of CR requires
Second step of PSL
32. How many 'bits' does the typical CR system have?
Backing layer
Optical filters
Typical number of pixels in a matrix ranges from
10 - 12 - 16
33. Cassette-based digital imaging is the digital acquisition modality that uses storage phosphor plates to produce projection images
Postprocessing
Reflective layer
Typical number of pixels in a matrix ranges from
Computed Radiography
34. Determines average pixel value in quantitative imaging
Protective layer
Final step of PSL
Magnification
Region of Interest (ROI)
35. X-ray beam exposes a PSP - the energy transfer results in excitation of electron into a metastable state.
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
Reflective layer
Conductor layer
First step of PSL
36. Is erasing the plate signal
The more pixels
Final step of PSL
Amplification and conversion to digital image
Typical number of pixels in a matrix ranges from
37. What does pixel size determine
Spatial resolution
Beam-shaping optics
Image flip and image inversion
Window and level
38. Labeling the image
Annotation
Reflective layer
`The laser light is emitted at approximately
The most common phosphor with characteristics favorable for CR is...
39. 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
Color layer
the Laser
The use of CR requires
40. Expands the digital grayscale to visible
First step of PSL
Phosphor or Active layer
Protective layer
Window and level
41. Performed to optimize the appearance of the image for purpose of better detecting pathology
Postprocessing
Optical filters
Laser scanning; Conversion to analog signal.
Support layer
42. The greater the spatial image resolution.
Final step of PSL
The more pixels
Conductive layer
Reflective layer
43. 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
Phosphor or Active layer
Second step of PSL
44. In what step is an amplifier used to match the PMT output signal to the ADC values?
S number
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
Photostimulable Luminescence (PSL
Amplification and conversion to digital image
45. Located between the active and support layers if the IP that absorbs the stimulating light but reflects emitted light. (for newer plates)
Color layer
Conductive layer
The use of CR requires
Protective layer
46. Keeps the laser beam constant size - shape - speed and intensity
Third step of PSL
Photodetector
Beam-shaping optics
First 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
Light-collecting optics
Optical filters
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
Photostimulable Luminescence (PSL
48. What are the steps in Computed Radiography Image Processing?
Second step of PSL
100-200 micrometers
Readout processing; Laser scanning - Conversion to analog signal; Amplification and conversion to digital signal; Spatial resolution; Contrast resolution.
10 - 12 - 16
49. 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
Computer Control functions
First step of PSL
50. Processes for amplitude - scale and compression - Shapes the signal before the final image is formed
Region of Interest (ROI)
Computer Control functions
Laser scanning; Conversion to analog signal.
Subtraction (DSA)