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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. Computer memory is often rated in terms of total ____ memory.
byte
digital imaging and communication in medicine
direct
1960s
2. Which memory replaces new information with the old; can change?
high
transverse - sagittal - and coronal
write memory
direct
3. Computerized digital images are described in terms of what
signal-to-noise ratio
number of values displayed per image side
direct
software
4. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
write memory
computer - radiographer
frequency
large amount
5. What is the raw data to which a Fourier Transformation is applied to create the digital image?
programs and data
pixel
frequency
greater
6. In what time period did microchip technology come out?
monitors and printers
central processing unit
1960s
signal-to-noise ratio
7. What 3 things were required prior to digital computer applications in medical imaging?
byte
mathematical theory - solid-state electronics - and microchip technology
greater
analog-to-digital converters
8. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?
2^x
filtering
edge enhancement filtering or sharpening
bit
9. Computer equipment is called what?
central processing unit
high-pass filtering
detector
hardware
10. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.
1960s
analog-to-digital converters
software
parallel - serial
11. What type of scanning increases resolution slightly by scanning all 525 lines in order?
progressive scanning
byte
direct
analog computers
12. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
RAM - ROM
binary machine
CT and MRI
pixel
13. What type of scanning increases resolution but can't be used in real-time dynamic studies?
0 - 1
bus
on
slow scanning
14. What is the frequency response of the incoming signal called?
peripherals
decrease
progressive scanning
bandwidth
15. What changes the pixel value by addition or subtraction and controls image density?
abacus
window level
pixel
bus
16. Computerized digital images are described in terms of what
number of values displayed per image side
magnetic tape
digital image
bus speed
17. When detectors acquire their information through ____ they are receiving all the info at once.
inversely
array detection
1970s-1990s
matrix size
18. In what time period did microchip technology come out?
computer - radiographer
digital imaging and communication in medicine
1960s
digital image
19. Which memory replaces new information with the old; can change?
increase
magnetic tape
health level 7
write memory
20. What modalities are array processors useful for?
Fourier Transformation
bus speed
scanning or array detection
CT and MRI
21. Which computers handle data composed of continuously varying electrical currents?
high
analog computers
hardware
1940s
22. Increased noise = _____ image contrast.
DICOM standard
digital computers
decreased
greater
23. What is the random background information that does not contribute to the image quality?
shades of gray
window
1940s
noise
24. What provides specific instructions for calculations and sequential steps to be followed?
1940s
software
IRs
off
25. What is the equation for determining gray scale bit depth?
2^x
smoothing
low
binary machine
26. A larger matrix provides ____ pixels.
smaller
binary machine
frequency
fine
27. Modalities differ in bit depth that is available depending on the capabilities of what?
IR
central processing unit
computers
Input devices
28. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
binary machine
low
ROM
1940s
29. What does a 1 in binary code stand for?
bit
on
number of values displayed per image side
peripherals
30. What is a square series of boxes that gives form to the image?
mathematical theory - solid-state electronics - and microchip technology
byte
matrix
number of values displayed per image side
31. What is an individual matrix box or picture element?
decreased
Fourier Transformation
pixel
greater
32. What type of scanning increases resolution slightly by scanning all 525 lines in order?
software
scanning or array detection
progressive scanning
binary machine
33. What can memory be transferred as?
greater
noise
voltage
array detection
34. Who or What is responsible for density changes on a digital image? On a manual image
TV camera
computer - radiographer
scanning
32
35. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?
scanning
filtering
increase
inverse
36. Resolution is controlled by what?
expansion or compression
on
matrix size
bit
37. What is the name for an 8-bit word?
high
byte
decreased
analog-to-digital converters
38. What is high-pass filtering also called?
byte
edge enhancement filtering or sharpening
1-2 lp/mm
contrast
39. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
fine
digital image
memory
bus
40. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.
parallel - serial
CD or DVD
inverse
binary machine
41. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
32
Input devices
large amount
write memory
42. What permit input/output of information to or from the CPU?
two
filtering
peripherals
smaller
43. The computer either ____ or ____ selected frequencies during the filtering process.
transverse - sagittal - and coronal
numerical value
scanning
accentuates or suppresses
44. What is the name for an 8-bit word?
hardware
number of values displayed per image side
byte
transverse - sagittal - and coronal
45. Computer equipment is called what?
Fourier Transformation
hardware
ENIAC
CD or DVD
46. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.
inversely
low-pass filter
software
bus
47. What is critical to how fast the computer system can function?
low-pass - band-pass - and high-pass
bus speed
scanning or array detection
large amount
48. 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.
0 - 1
progressive scanning
CD or DVD
shades of gray
49. What is an image that has been converted into numerical values for transmission or processing?
digital image
200 - 500-1000
digital computers
1960s
50. 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?
reduces
transverse - sagittal - and coronal
frequency - contrast - and noise
little