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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.
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.
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. What modalities are array processors useful for?
CT and MRI
off
CD or DVD
IRs
2. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
IR
200 - 500-1000
numerical values
Fourier Transformation
3. Computers operate from ____ ____ language.
binary machine
numerical values
computers
2^x
4. Digitalization of analog information (increases / reduces) the quality and quantity of information?
Fourier Transformation
reduces
array detection
low-pass filter
5. A high contrast image has a ___ frequency.
high
1940s
IR
frequency
6. What changes the pixel value by multiplication or division and controls image contrast?
edge enhancement filtering or sharpening
window width
bandwidth
scanning
7. A low contrast image has a ___ frequency.
low
binary machine
high
fine
8. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
smoothing
bus
parallel - serial
ENIAC
9. What is the measure of the differences between the data values referred to as?
reduces
array detection
CT and MRI
contrast
10. What is an individual matrix box or picture element?
pixel
pixel size
numerical value
byte
11. Noise is measured as what?
signal-to-noise ratio
program
IR
parallel - serial
12. Noise is ____ related to contrast.
fine
monitors and printers
inversely
accentuates or suppresses
13. Modalities differ in bit depth that is available depending on the capabilities of what?
band-pass filtering
IR
raster scan pattern
2^x
14. Because the range of stored densities is so much wider than the visual range - any digital image is only a small part of the total data obtained - each image is a _____ on the total range of data.
accentuates or suppresses
accentuates or suppresses
window
Fourier Transformation
15. What provides specific instructions for calculations and sequential steps to be followed?
signal-to-noise ratio
reduces
software
magnetic tape
16. What are the two most common output devices?
slow scanning
memory
CD or DVD
monitors and printers
17. What are the 3 classifications of digitized image filters?
peripherals
band-pass filtering
low-pass - band-pass - and high-pass
memory
18. Medical imaging is often achieved from information that has been processed by what?
read memory
analog-to-digital converters
software
0 - 1
19. There is a ___ relationship between subject contrast and acquired data contrast.
read memory
low-pass filter
direct
pixel size
20. What is the 'heart' of every computer?
1940s
two
byte
central processing unit
21. All medical imaging is achieved with which type of computers?
RAM
computer - radiographer
inverse
digital computers
22. In what time period did microchip technology come out?
1960s
on
accentuates or suppresses
digital computers
23. Increased noise = _____ image contrast.
matrix
1945
decreased
expansion or compression
24. Digitalization of analog information (increases / reduces) the quality and quantity of information?
increase
byte
200 - 500-1000
reduces
25. What is the random background information that does not contribute to the image quality?
numerical values
decrease
DICOM standard
noise
26. Each pixel is capable of representing a wide range of what?
shades of gray
filtering
programs and data
large amount
27. Because the range of stored densities is so much wider than the visual range - any digital image is only a small part of the total data obtained - each image is a _____ on the total range of data.
scanning or array detection
window
raster scan pattern
off
28. What is the frequency response of the incoming signal called?
bandwidth
low
CPU - Bus
bus
29. Noise is measured as what?
signal-to-noise ratio
10 megabyte
RAM - ROM
matrix
30. Resolution is controlled by what?
window level
pixel size
Input devices
matrix size
31. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.
contrast
numerical value
pixel
transverse - sagittal - and coronal
32. When detectors acquire their information through ____ they are receiving all the info at once.
array detection
monitors and printers
signal-to-noise ratio
bus
33. Which type of information consists of collected facts?
fine
parallel - serial
1-2 lp/mm
data
34. Fluoroscopic noise mostly comes from what?
electronic sources
number of values displayed per image side
200 - 500-1000
analog-to-digital converters
35. What modalities are array processors useful for?
program
CT and MRI
voltage
analog-to-digital converters
36. What directs information to and from various parts of the computer?
monitors and printers
central processing unit
window width
bus
37. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
programs and data
detector
inversely
bus
38. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
low-pass - band-pass - and high-pass
bit
RAM
TV camera
39. What is the equation for determining gray scale bit depth?
10 megabyte
low-pass - band-pass - and high-pass
Fourier Transformation
2^x
40. What provides specific instructions for calculations and sequential steps to be followed?
software
matrix
parallel - serial
bus speed
41. What are the two types of information computers use?
programs and data
window
2^x
gray scale bit depth
42. Which type of filter amplifies or deletes all but a selected range or band of frequencies and is useful in the elimination of characteristic emission peaks?
inverse
number of values displayed per image side
little
band-pass filtering
43. Which memory replaces new information with the old; can change?
1940s
bus
write memory
large amount
44. A high contrast image has a ___ frequency.
high
matrix size
0 - 1
digital computers
45. The computer either ____ or ____ selected frequencies during the filtering process.
1940s
increase
accentuates or suppresses
1-2 lp/mm
46. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
abacus
frequency
window
RAM - ROM
47. Binary systems operate with a ___-symbol language.
two
smaller
window
1970s-1990s
48. What is the 'noisiest' component of a digital system?
scanning
TV camera
matrix
computer - radiographer
49. What are the two types of information computers use?
programs and data
bus
accentuates or suppresses
CPU - Bus
50. A low contrast image has a ___ frequency.
inverse
electronic sources
read memory
low
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