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Test your basic knowledge |
Digital Image Processing
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Subject
:
engineering
Instructions:
Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
ROM
central processing unit
shades of gray
bit
2. 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.
high-pass filtering
computers
read memory
software
3. A larger matrix provides ____ pixels.
low
1940s
smaller
monitors and printers
4. Computer memory is often rated in terms of total ____ memory.
data
byte
TV camera
software
5. What is an image that has been converted into numerical values for transmission or processing?
digital image
health level 7
hardware
voxel
6. What type of memory storage devices are required for large amounts of data?
software
CD or DVD
low-pass - band-pass - and high-pass
data
7. What is the name of the 'modern electronic computer'?
reduces
byte
abacus
ENIAC
8. Computers operate from ____ ____ language.
number of values displayed per image side
decreased
pixel size
binary machine
9. Which type of information consists of operating instructions?
program
matrix size
magnetic tape
expansion or compression
10. What does DICOM stand for?
high-pass filtering
10 megabyte
computers
digital imaging and communication in medicine
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?
DICOM standard
TV camera
transverse - sagittal - and coronal
bus speed
12. What are the two most common output devices?
signal-to-noise ratio
monitors and printers
progressive scanning
bandwidth
13. What modalities are array processors useful for?
CT and MRI
array processors
contrast
frequency - contrast - and noise
14. What changes the pixel value by addition or subtraction and controls image density?
Fourier Transformation
window level
byte
mathematical theory - solid-state electronics - and microchip technology
15. What provides specific instructions for calculations and sequential steps to be followed?
number of values displayed per image side
central processing unit
transverse - sagittal - and coronal
software
16. Which memory replaces new information with the old; can change?
1945
software
CPU - Bus
write memory
17. What is critical to how fast the computer system can function?
memory
array processors
pixel
bus speed
18. A __ _____ disk will store over 10000000 bytes of information.
10 megabyte
high
direct
number of values displayed per image side
19. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
RAM
0 - 1
byte
2^x
20. The computer either ____ or ____ selected frequencies during the filtering process.
accentuates or suppresses
bus
program
smaller
21. If the window level increases - density will _____.
window width
increase
computers
1970s-1990s
22. Which type of information consists of collected facts?
low
voxel
data
bus
23. What directs information to and from various parts of the computer?
RAM
low-pass filter
DICOM standard
central processing unit
24. What is high-pass filtering also called?
edge enhancement filtering or sharpening
1-2 lp/mm
computers
pixel
25. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
array processors
bus
1945
raster scan pattern
26. Which computers handle data composed of continuously varying electrical currents?
low
analog computers
digital computers
200 - 500-1000
27. Noise is measured as what?
signal-to-noise ratio
magnetic tape
numerical values
1960s
28. What is the equation for determining gray scale bit depth?
2^x
matrix size
gray scale bit depth
byte
29. Which type of information consists of collected facts?
data
computer - radiographer
decrease
scanning
30. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?
mathematical theory - solid-state electronics - and microchip technology
filtering
decrease
digital computers
31. What are the 3 classifications of digitized image filters?
digital imaging and communication in medicine
edge enhancement filtering or sharpening
low-pass - band-pass - and high-pass
software
32. What was the earliest computer device called?
window width
abacus
smoothing
shades of gray
33. Which memory can only be extracted without alteration; cannot change?
program
signal-to-noise ratio
read memory
number of values displayed per image side
34. Fluoroscopic noise mostly comes from what?
progressive scanning
write memory
large amount
electronic sources
35. The number of shades of gray is determined by what?
gray scale bit depth
0 - 1
analog-to-digital converters
analog computers
36. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?
transverse - sagittal - and coronal
scanning
Fourier Transformation
filtering
37. What is the name for a binary digit?
RAM - ROM
bit
32
CPU - Bus
38. Resolution is controlled by what?
matrix size
accentuates or suppresses
central processing unit
voltage
39. Each pixel is capable of representing a wide range of what?
shades of gray
bus
matrix size
hardware
40. What type of scanning increases resolution but can't be used in real-time dynamic studies?
peripherals
abacus
slow scanning
number of values displayed per image side
41. When subject contrast is high - the acquired data contrast will be ____.
Input devices
high
little
low-pass filter
42. Because electrical currents are understood as being either on or off - the binary system consists of information recorded as either a _ for off or a _ for on.
fine
inverse
0 - 1
abacus
43. 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.
central processing unit
progressive scanning
high-pass filtering
array processors
44. What are devices that process information?
1960s
computers
byte
detector
45. In what time period did microchip technology come out?
shades of gray
1960s
contrast
little
46. Computers operate from ____ ____ language.
two
signal-to-noise ratio
progressive scanning
binary machine
47. When subject contrast is high - the acquired data contrast will be ____.
frequency
decreased
high
numerical values
48. What provides specific instructions for calculations and sequential steps to be followed?
1940s
digital image
high-pass filtering
software
49. The computer either ____ or ____ selected frequencies during the filtering process.
transverse - sagittal - and coronal
accentuates or suppresses
CD or DVD
byte
50. Around what time did digital computerization come out for CT and US?
1970s-1990s
pixel
analog-to-digital converters
RAM
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