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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. A high S/N indicates ___ noise in the image.
parallel - serial
fine
expansion or compression
little
2. A high contrast image has a ___ frequency.
frequency
high
ENIAC
number of values displayed per image side
3. What are devices such as keyboard - touch screen monitors - and voice-activation that you put into or connect to a computer?
little
bandwidth
Input devices
digital image
4. Resolution is controlled by what?
low-pass - band-pass - and high-pass
matrix size
32
large amount
5. What is the measure of the differences between the data values referred to as?
byte
signal-to-noise ratio
hardware
contrast
6. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.
digital image
matrix
parallel - serial
contrast
7. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.
matrix
1940s
numerical value
parallel - serial
8. What input device do radiographers use on a normal basis?
detector
IRs
binary machine
program
9. Increased noise = _____ image contrast.
CD or DVD
health level 7
decreased
matrix
10. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
decrease
1960s
large amount
fine
11. What type of scanning increases resolution but can't be used in real-time dynamic studies?
fine
slow scanning
raster scan pattern
software
12. What determines resolution?
pixel size
little
increase
write memory
13. What 3 things were required prior to digital computer applications in medical imaging?
high
DICOM standard
mathematical theory - solid-state electronics - and microchip technology
32
14. What input device do radiographers use on a normal basis?
CT and MRI
bit
1945
IRs
15. Computers operate from ____ ____ language.
computers
digital imaging and communication in medicine
binary machine
bus speed
16. Which type of information consists of collected facts?
1000+
data
RAM - ROM
mathematical theory - solid-state electronics - and microchip technology
17. What changes the pixel value by multiplication or division and controls image contrast?
number of values displayed per image side
window width
1940s
1000+
18. What is the 'heart' of every computer?
electronic sources
memory
CPU - Bus
central processing unit
19. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
peripherals
bus
array detection
reduces
20. Which computers handle data composed of definite quantities of current?
digital computers
computers
DICOM standard
peripherals
21. When was ENIAC invented?
1945
direct
digital imaging and communication in medicine
monitors and printers
22. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
pixel
RAM
binary machine
voxel
23. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?
analog computers
1970s-1990s
1945
peripherals
24. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.
inverse
numerical value
high
ROM
25. What can memory be transferred as?
contrast
low-pass filter
voltage
monitors and printers
26. When subject contrast is high - the acquired data contrast will be ____.
high
low-pass filter
central processing unit
smaller
27. Fluoroscopic noise mostly comes from what?
electronic sources
binary machine
numerical values
greater
28. In what time period did mathematical theory and solid-state electronics come out?
greater
scanning
frequency - contrast - and noise
1940s
29. What is an individual matrix box or picture element?
program
digital image
pixel
smaller
30. What are the two most common output devices?
central processing unit
monitors and printers
shades of gray
matrix
31. Changes in window width are sometimes called gray scale ____ or ____.
1960s
expansion or compression
digital image
byte
32. 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
window level
increase
low-pass filter
33. What is the equation for determining gray scale bit depth?
edge enhancement filtering or sharpening
scanning
numerical value
2^x
34. All medical imaging is achieved with which type of computers?
numerical values
low-pass - band-pass - and high-pass
frequency
digital computers
35. What type of scanning increases resolution slightly by scanning all 525 lines in order?
array processors
signal-to-noise ratio
contrast
progressive scanning
36. When was ENIAC invented?
CD or DVD
1945
voxel
direct
37. The _____ the matrix size - the better the resolution.
greater
detector
noise
expansion or compression
38. 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.
1940s
computer - radiographer
10 megabyte
0 - 1
39. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
program
numerical value
progressive scanning
large amount
40. What 3 things were required prior to digital computer applications in medical imaging?
greater
binary machine
voxel
mathematical theory - solid-state electronics - and microchip technology
41. 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?
digital computers
band-pass filtering
slow scanning
bandwidth
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?
array processors
analog-to-digital converters
matrix size
band-pass filtering
43. Changes in window width are sometimes called gray scale ____ or ____.
data
expansion or compression
little
read memory
44. What modalities are array processors useful for?
CT and MRI
RAM
health level 7
contrast
45. 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
matrix size
magnetic tape
RAM
46. The human visual range is ___ or fewer shades of gray.
32
filtering
10 megabyte
smaller
47. Noise is ____ related to contrast.
IRs
inversely
low-pass filter
magnetic tape
48. Binary systems operate with a ___-symbol language.
program
digital imaging and communication in medicine
two
32
49. Around what time did digital computerization come out for CT and US?
hardware
matrix
parallel - serial
1970s-1990s
50. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
on
health level 7
numerical values
magnetic tape