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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.
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 changes the pixel value by addition or subtraction and controls image density?
abacus
CD or DVD
expansion or compression
window level
2. What determines resolution?
1-2 lp/mm
CT and MRI
pixel size
10 megabyte
3. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.
TV camera
low-pass filter
bus
parallel - serial
4. Noise is measured as what?
memory
1970s-1990s
signal-to-noise ratio
1940s
5. If window width increases - image contrast will ____.
decrease
byte
health level 7
smaller
6. If the window level increases - density will _____.
digital computers
bus
increase
bus speed
7. What is the 'noisiest' component of a digital system?
pixel
Fourier Transformation
little
TV camera
8. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
decreased
accentuates or suppresses
200 - 500-1000
band-pass filtering
9. Changes in window width are sometimes called gray scale ____ or ____.
expansion or compression
high
0 - 1
little
10. Digitalization of analog information (increases / reduces) the quality and quantity of information?
numerical values
electronic sources
reduces
window width
11. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
hardware
RAM - ROM
CPU - Bus
voltage
12. What directs information to and from various parts of the computer?
central processing unit
0 - 1
frequency - contrast - and noise
progressive scanning
13. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?
byte
software
peripherals
RAM - ROM
14. Which type of information consists of collected facts?
number of values displayed per image side
inversely
data
scanning
15. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.
10 megabyte
numerical value
TV camera
reduces
16. What is the raw data to which a Fourier Transformation is applied to create the digital image?
frequency
ROM
write memory
expansion or compression
17. Binary systems operate with a ___-symbol language.
1-2 lp/mm
large amount
two
inversely
18. Each pixel is capable of representing a wide range of what?
progressive scanning
shades of gray
filtering
digital image
19. Computerized digital images are described in terms of what
number of values displayed per image side
bus
increase
CD or DVD
20. What is the frequency response of the incoming signal called?
off
CPU - Bus
central processing unit
bandwidth
21. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?
magnetic tape
computer - radiographer
scanning
bus
22. 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.
window
high
low
matrix
23. Fluoroscopic noise mostly comes from what?
frequency - contrast - and noise
electronic sources
200 - 500-1000
RAM - ROM
24. 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?
band-pass filtering
32
programs and data
pixel size
25. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?
filtering
high
digital computers
matrix
26. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
voltage
bus
1940s
monitors and printers
27. What is the information stored as magnetic variations referred to as?
memory
CD or DVD
10 megabyte
magnetic tape
28. What is the random background information that does not contribute to the image quality?
noise
greater
decreased
analog-to-digital converters
29. Window width and contrast have an ____ relationship.
band-pass filtering
inverse
scanning
window
30. Binary systems operate with a ___-symbol language.
200 - 500-1000
pixel size
two
voltage
31. What is the equation for determining gray scale bit depth?
array detection
ENIAC
2^x
smaller
32. What type of memory storage devices are required for large amounts of data?
on
software
CD or DVD
200 - 500-1000
33. When detectors acquire their information by ____ they are receiving info from a specific area.
bus
reduces
scanning
1960s
34. What is the 'noisiest' component of a digital system?
high-pass filtering
inversely
matrix
TV camera
35. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
numerical values
decreased
digital computers
high-pass filtering
36. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
slow scanning
10 megabyte
byte
ROM
37. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
window level
expansion or compression
central processing unit
RAM
38. Which memory can only be extracted without alteration; cannot change?
bus
numerical values
read memory
accentuates or suppresses
39. What are the two ways detectors acquire information?
voxel
bus
pixel size
scanning or array detection
40. Computer memory is often rated in terms of total ____ memory.
byte
numerical value
fine
software
41. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
bus
two
1-2 lp/mm
decrease
42. What changes the pixel value by multiplication or division and controls image contrast?
pixel
ROM
32
window width
43. What type of scanning increases resolution but can't be used in real-time dynamic studies?
Input devices
bit
slow scanning
IRs
44. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
smoothing
off
bus speed
digital imaging and communication in medicine
45. What is the raw data to which a Fourier Transformation is applied to create the digital image?
byte
gray scale bit depth
ENIAC
frequency
46. 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?
analog-to-digital converters
2^x
band-pass filtering
1960s
47. Medical imaging is often achieved from information that has been processed by what?
frequency
fine
analog-to-digital converters
digital imaging and communication in medicine
48. The quality of the data acquired from the IR is measured by what three data characteristics?
frequency - contrast - and noise
programs and data
digital image
abacus
49. What is the frequency response of the incoming signal called?
DICOM standard
bandwidth
32
IR
50. 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.
expansion or compression
analog computers
0 - 1
RAM - ROM
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