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Test your basic knowledge |
Digital Image Processing
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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 larger matrix provides ____ pixels.
smaller
CPU - Bus
progressive scanning
pixel
2. Which memory can only be extracted without alteration; cannot change?
read memory
byte
magnetic tape
window
3. When subject contrast is high - the acquired data contrast will be ____.
fine
off
digital image
high
4. What is the information stored as magnetic variations referred to as?
number of values displayed per image side
CPU - Bus
digital computers
memory
5. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
matrix size
ROM
hardware
low-pass filter
6. The number of shades of gray is determined by what?
large amount
computers
greater
gray scale bit depth
7. The human visual range is ___ or fewer shades of gray.
bus
CD or DVD
32
pixel
8. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.
peripherals
greater
reduces
parallel - serial
9. What changes the pixel value by multiplication or division and controls image contrast?
write memory
CD or DVD
hardware
window width
10. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
programs and data
1-2 lp/mm
large amount
two
11. It is important that the radiographer understand anatomy from different perspectives due to the methods of digital processing and image information? What are the 3 perspectives?
transverse - sagittal - and coronal
decrease
central processing unit
abacus
12. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
bus
window width
pixel size
numerical values
13. What are the two most common output devices?
monitors and printers
smoothing
signal-to-noise ratio
number of values displayed per image side
14. What is high-pass filtering also called?
edge enhancement filtering or sharpening
analog computers
data
computer - radiographer
15. In what time period did microchip technology come out?
number of values displayed per image side
1960s
mathematical theory - solid-state electronics - and microchip technology
CT and MRI
16. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.
peripherals
low-pass filter
two
CPU - Bus
17. There is a ___ relationship between subject contrast and acquired data contrast.
hardware
direct
numerical value
frequency
18. Medical imaging is often achieved from information that has been processed by what?
analog-to-digital converters
low
IRs
decreased
19. If the window level increases - density will _____.
little
number of values displayed per image side
binary machine
increase
20. What are devices that process information?
peripherals
frequency
matrix size
computers
21. What modalities are array processors useful for?
decrease
low-pass filter
central processing unit
CT and MRI
22. When detectors acquire their information by ____ they are receiving info from a specific area.
program
two
binary machine
scanning
23. What is the equation for determining gray scale bit depth?
detector
2^x
low-pass - band-pass - and high-pass
gray scale bit depth
24. It is important that the radiographer understand anatomy from different perspectives due to the methods of digital processing and image information? What are the 3 perspectives?
transverse - sagittal - and coronal
off
detector
peripherals
25. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
ROM
RAM - ROM
ENIAC
noise
26. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
decrease
RAM
smaller
10 megabyte
27. If the window level increases - density will _____.
write memory
contrast
increase
bus
28. When was ENIAC invented?
high
number of values displayed per image side
1945
frequency
29. The ____ is the heart of the computer while the ___ is the vessels.
raster scan pattern
transverse - sagittal - and coronal
1000+
CPU - Bus
30. Modalities differ in bit depth that is available depending on the capabilities of what?
IR
direct
voxel
expansion or compression
31. What is the 'noisiest' component of a digital system?
TV camera
bit
array detection
2^x
32. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
numerical values
bandwidth
edge enhancement filtering or sharpening
1000+
33. The number of shades of gray is determined by what?
digital computers
0 - 1
gray scale bit depth
RAM - ROM
34. What type of memory storage devices are required for large amounts of data?
10 megabyte
CD or DVD
numerical value
expansion or compression
35. What are the 3 classifications of digitized image filters?
decreased
hardware
direct
low-pass - band-pass - and high-pass
36. The quality of the data acquired from the IR is measured by what three data characteristics?
matrix size
frequency - contrast - and noise
numerical values
32
37. Computer memory is often rated in terms of total ____ memory.
byte
binary machine
detector
accentuates or suppresses
38. What is the primary limitation with the resolution on digital images?
digital imaging and communication in medicine
slow scanning
TV camera
raster scan pattern
39. What is the mathematical algorithm used to create all medical images?
central processing unit
CPU - Bus
Fourier Transformation
byte
40. Noise is measured as what?
ENIAC
signal-to-noise ratio
fine
DICOM standard
41. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?
large amount
magnetic tape
signal-to-noise ratio
digital imaging and communication in medicine
42. Which type of filter amplifies or deletes all but the high frequencies - appears to increase contrast - and is useful in vascular imaging or digital mammo.
ENIAC
edge enhancement filtering or sharpening
monitors and printers
high-pass filtering
43. The _____ the matrix size - the better the resolution.
greater
0 - 1
1960s
magnetic tape
44. Binary systems operate with a ___-symbol language.
parallel - serial
two
CD or DVD
detector
45. What is the name for a binary digit?
bit
number of values displayed per image side
1945
reduces
46. What was the earliest computer device called?
pixel size
frequency
frequency - contrast - and noise
abacus
47. What are devices such as keyboard - touch screen monitors - and voice-activation that you put into or connect to a computer?
on
software
reduces
Input devices
48. Around what time did digital computerization come out for CT and US?
TV camera
write memory
1970s-1990s
CD or DVD
49. In what time period did mathematical theory and solid-state electronics come out?
CT and MRI
edge enhancement filtering or sharpening
1940s
abacus
50. All medical imaging is achieved with which type of computers?
digital computers
data
computers
smaller
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