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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 directs information to and from various parts of the computer?
smaller
central processing unit
matrix size
CD or DVD
2. When subject contrast is high - the acquired data contrast will be ____.
low-pass - band-pass - and high-pass
high
DICOM standard
slow scanning
3. What is the random background information that does not contribute to the image quality?
noise
CT and MRI
reduces
gray scale bit depth
4. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
filtering
write memory
analog-to-digital converters
ROM
5. What is the mathematical algorithm used to create all medical images?
Fourier Transformation
CD or DVD
IR
digital computers
6. Window width and contrast have an ____ relationship.
digital image
inverse
digital image
window width
7. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.
CT and MRI
parallel - serial
memory
array processors
8. Noise is measured as what?
signal-to-noise ratio
electronic sources
progressive scanning
window level
9. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.
low-pass filter
1960s
numerical values
little
10. What is the primary limitation with the resolution on digital images?
memory
health level 7
computers
raster scan pattern
11. Digital detectors are capable of producing ______ shades of gray.
pixel
2^x
1000+
DICOM standard
12. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
CT and MRI
32
frequency
RAM - ROM
13. What does a 1 in binary code stand for?
200 - 500-1000
on
IR
program
14. What is critical to how fast the computer system can function?
raster scan pattern
bus speed
2^x
10 megabyte
15. What 3 things were required prior to digital computer applications in medical imaging?
on
smaller
ROM
mathematical theory - solid-state electronics - and microchip technology
16. The number of shades of gray is determined by what?
scanning
DICOM standard
Fourier Transformation
gray scale bit depth
17. What are devices such as keyboard - touch screen monitors - and voice-activation that you put into or connect to a computer?
two
increase
mathematical theory - solid-state electronics - and microchip technology
Input devices
18. What are the two ways detectors acquire information?
write memory
detector
scanning
scanning or array detection
19. What type of scanning increases resolution slightly by scanning all 525 lines in order?
200 - 500-1000
edge enhancement filtering or sharpening
off
progressive scanning
20. If window width increases - image contrast will ____.
array processors
program
abacus
decrease
21. Digitalization of analog information (increases / reduces) the quality and quantity of information?
reduces
software
memory
analog-to-digital converters
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.
analog-to-digital converters
shades of gray
window
edge enhancement filtering or sharpening
23. A high S/N indicates ___ noise in the image.
decrease
little
bit
bus speed
24. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
digital computers
array detection
large amount
parallel - serial
25. Increased noise = _____ image contrast.
band-pass filtering
decreased
digital imaging and communication in medicine
greater
26. What permit input/output of information to or from the CPU?
matrix size
1940s
low
peripherals
27. When subject contrast is high - the acquired data contrast will be ____.
transverse - sagittal - and coronal
high
software
low-pass filter
28. What changes the pixel value by addition or subtraction and controls image density?
window level
direct
decrease
analog computers
29. A high contrast image has a ___ frequency.
1000+
digital computers
little
high
30. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
matrix size
high
off
200 - 500-1000
31. If the window level increases - density will _____.
bandwidth
low-pass filter
increase
signal-to-noise ratio
32. Which computers handle data composed of continuously varying electrical currents?
electronic sources
analog computers
array processors
low
33. When detectors acquire their information by ____ they are receiving info from a specific area.
fine
bandwidth
scanning
parallel - serial
34. What provides specific instructions for calculations and sequential steps to be followed?
window
software
smaller
electronic sources
35. Binary systems operate with a ___-symbol language.
1940s
numerical values
Input devices
two
36. What does a 1 in binary code stand for?
programs and data
signal-to-noise ratio
0 - 1
on
37. What provides specific instructions for calculations and sequential steps to be followed?
software
monitors and printers
matrix size
hardware
38. 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.
1940s
high-pass filtering
numerical values
1000+
39. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?
signal-to-noise ratio
computer - radiographer
RAM - ROM
filtering
40. Which type of information consists of collected facts?
digital computers
direct
window
data
41. Modalities differ in bit depth that is available depending on the capabilities of what?
IR
ENIAC
software
direct
42. What is the name for a binary digit?
bit
fine
data
voxel
43. What does a 0 in binary code stand for?
off
digital computers
high
1945
44. What are devices that process information?
matrix size
computers
transverse - sagittal - and coronal
digital computers
45. Computer memory is often rated in terms of total ____ memory.
frequency - contrast - and noise
byte
write memory
greater
46. What is an individual matrix box or picture element?
low-pass - band-pass - and high-pass
pixel
gray scale bit depth
1940s
47. What is an image that has been converted into numerical values for transmission or processing?
contrast
10 megabyte
digital image
high
48. What type of memory storage devices are required for large amounts of data?
TV camera
off
software
CD or DVD
49. What determines resolution?
pixel size
digital computers
numerical values
byte
50. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?
magnetic tape
digital imaging and communication in medicine
low-pass filter
32