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Test your basic knowledge |
Digital Image Processing
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. What does a 1 in binary code stand for?
on
detector
bit
peripherals
2. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
computers
voxel
magnetic tape
reduces
3. What 3 things were required prior to digital computer applications in medical imaging?
mathematical theory - solid-state electronics - and microchip technology
numerical values
1940s
TV camera
4. What are devices such as keyboard - touch screen monitors - and voice-activation that you put into or connect to a computer?
peripherals
noise
digital computers
Input devices
5. A low contrast image has a ___ frequency.
low
CD or DVD
1940s
inversely
6. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
smoothing
computers
byte
frequency - contrast - and noise
7. What does a 0 in binary code stand for?
RAM - ROM
window width
peripherals
off
8. Who or What is responsible for density changes on a digital image? On a manual image
high-pass filtering
data
array detection
computer - radiographer
9. Increased noise = _____ image contrast.
decrease
band-pass filtering
decreased
DICOM standard
10. When detectors acquire their information through ____ they are receiving all the info at once.
array detection
scanning
digital image
fine
11. What is an individual matrix box or picture element?
filtering
computers
pixel
band-pass filtering
12. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
parallel - serial
edge enhancement filtering or sharpening
numerical values
CD or DVD
13. What type of memory storage devices are required for large amounts of data?
noise
raster scan pattern
CD or DVD
digital image
14. What provides specific instructions for calculations and sequential steps to be followed?
software
raster scan pattern
1970s-1990s
progressive scanning
15. A __ _____ disk will store over 10000000 bytes of information.
scanning or array detection
10 megabyte
digital computers
1960s
16. The number of shades of gray is determined by what?
gray scale bit depth
0 - 1
bus
bandwidth
17. What is the frequency response of the incoming signal called?
IR
low-pass filter
gray scale bit depth
bandwidth
18. The _____ the matrix size - the better the resolution.
detector
binary machine
greater
matrix
19. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
RAM - ROM
central processing unit
software
software
20. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
200 - 500-1000
read memory
binary machine
large amount
21. A larger matrix provides ____ pixels.
binary machine
high
byte
smaller
22. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
health level 7
RAM - ROM
matrix size
digital computers
23. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.
analog-to-digital converters
analog-to-digital converters
low-pass filter
pixel
24. What changes the pixel value by addition or subtraction and controls image density?
RAM
1940s
band-pass filtering
window level
25. 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.
Input devices
band-pass filtering
write memory
high-pass filtering
26. What type of scanning increases resolution slightly by scanning all 525 lines in order?
progressive scanning
window width
scanning
low
27. What is a square series of boxes that gives form to the image?
noise
matrix
1960s
array processors
28. What are the two types of information computers use?
matrix size
programs and data
write memory
slow scanning
29. If the window level increases - density will _____.
central processing unit
increase
smoothing
smoothing
30. What are the two ways detectors acquire information?
parallel - serial
digital image
scanning or array detection
data
31. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
electronic sources
analog-to-digital converters
bus
mathematical theory - solid-state electronics - and microchip technology
32. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
detector
low-pass filter
fine
large amount
33. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
ROM
numerical value
10 megabyte
central processing unit
34. What type of scanning increases resolution but can't be used in real-time dynamic studies?
edge enhancement filtering or sharpening
slow scanning
bus speed
little
35. Noise is ____ related to contrast.
scanning or array detection
high
smoothing
inversely
36. The ____ is the heart of the computer while the ___ is the vessels.
scanning
decreased
CPU - Bus
health level 7
37. Which type of information consists of collected facts?
1-2 lp/mm
data
numerical value
slow scanning
38. What changes the pixel value by multiplication or division and controls image contrast?
window width
Input devices
increase
inversely
39. What is the information stored as magnetic variations referred to as?
low
memory
CPU - Bus
central processing unit
40. What can memory be transferred as?
raster scan pattern
inversely
off
voltage
41. What is required for collection of input information?
peripherals
scanning or array detection
detector
high-pass filtering
42. Computers operate from ____ ____ language.
array processors
10 megabyte
binary machine
gray scale bit depth
43. What is critical to how fast the computer system can function?
bus speed
shades of gray
off
magnetic tape
44. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
0 - 1
voxel
software
pixel
45. Digitalization of analog information (increases / reduces) the quality and quantity of information?
accentuates or suppresses
software
shades of gray
reduces
46. 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.
smaller
DICOM standard
read memory
0 - 1
47. When detectors acquire their information by ____ they are receiving info from a specific area.
32
numerical value
mathematical theory - solid-state electronics - and microchip technology
scanning
48. What does DICOM stand for?
digital imaging and communication in medicine
scanning or array detection
analog-to-digital converters
1945
49. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.
off
CT and MRI
numerical value
peripherals
50. Noise is measured as what?
signal-to-noise ratio
analog computers
CD or DVD
greater