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Test your basic knowledge |
Digital Image Processing
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Study First
Subject
:
engineering
Instructions:
Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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.
two
little
digital computers
software
2. What is the digital standard for imaging that is designed to ensure that all equipment fro all manufacturers who choose to adhere to the standard are speaking the same computer language?
DICOM standard
0 - 1
fine
window level
3. What is the name of the 'modern electronic computer'?
1945
two
ENIAC
numerical value
4. What changes the pixel value by addition or subtraction and controls image density?
window level
array detection
DICOM standard
reduces
5. 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?
low
byte
band-pass filtering
CPU - Bus
6. What determines resolution?
transverse - sagittal - and coronal
pixel size
1-2 lp/mm
high
7. What modalities are array processors useful for?
CT and MRI
digital image
bandwidth
accentuates or suppresses
8. A __ _____ disk will store over 10000000 bytes of information.
200 - 500-1000
voxel
10 megabyte
numerical value
9. Window width and contrast have an ____ relationship.
two
two
inverse
byte
10. What permit input/output of information to or from the CPU?
signal-to-noise ratio
ENIAC
low-pass filter
peripherals
11. Noise is measured as what?
software
decreased
digital computers
signal-to-noise ratio
12. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
high
analog-to-digital converters
CPU - Bus
RAM
13. What 3 things were required prior to digital computer applications in medical imaging?
smoothing
pixel size
mathematical theory - solid-state electronics - and microchip technology
central processing unit
14. 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?
parallel - serial
32
CPU - Bus
transverse - sagittal - and coronal
15. Digitalization of analog information (increases / reduces) the quality and quantity of information?
Fourier Transformation
CD or DVD
reduces
software
16. In what time period did mathematical theory and solid-state electronics come out?
slow scanning
32
1940s
expansion or compression
17. 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.
slow scanning
200 - 500-1000
expansion or compression
high-pass filtering
18. What is the name for an 8-bit word?
byte
contrast
CT and MRI
computer - radiographer
19. Modalities differ in bit depth that is available depending on the capabilities of what?
IR
binary machine
progressive scanning
voltage
20. What type of memory storage devices are required for large amounts of data?
numerical value
IRs
CD or DVD
analog-to-digital converters
21. What does a 1 in binary code stand for?
greater
on
magnetic tape
0 - 1
22. If the window level increases - density will _____.
program
bus speed
abacus
increase
23. What is the name for an 8-bit word?
byte
matrix size
peripherals
magnetic tape
24. 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.
off
window
high-pass filtering
transverse - sagittal - and coronal
25. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.
central processing unit
smoothing
low-pass filter
frequency
26. What are devices that process information?
scanning or array detection
abacus
read memory
computers
27. Computer memory is often rated in terms of total ____ memory.
byte
IR
on
progressive scanning
28. What changes the pixel value by multiplication or division and controls image contrast?
inverse
pixel size
window width
analog-to-digital converters
29. What are the two ways detectors acquire information?
scanning or array detection
raster scan pattern
RAM - ROM
data
30. What is the 'heart' of every computer?
central processing unit
contrast
health level 7
bus speed
31. What type of scanning increases resolution but can't be used in real-time dynamic studies?
electronic sources
slow scanning
DICOM standard
two
32. A low contrast image has a ___ frequency.
matrix size
low
greater
CPU - Bus
33. When subject contrast is high - the acquired data contrast will be ____.
frequency - contrast - and noise
high
reduces
high-pass filtering
34. 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
programs and data
computer - radiographer
decrease
35. A high contrast image has a ___ frequency.
1000+
band-pass filtering
high
low
36. What is the equation for determining gray scale bit depth?
pixel size
2^x
200 - 500-1000
voltage
37. When detectors acquire their information through ____ they are receiving all the info at once.
little
array detection
32
analog-to-digital converters
38. In what time period did microchip technology come out?
200 - 500-1000
matrix
direct
1960s
39. What are devices such as keyboard - touch screen monitors - and voice-activation that you put into or connect to a computer?
accentuates or suppresses
Input devices
matrix
programs and data
40. What is the information stored as magnetic variations referred to as?
binary machine
ENIAC
memory
program
41. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?
software
smoothing
magnetic tape
matrix size
42. If window width increases - image contrast will ____.
two
shades of gray
decrease
scanning
43. What is the random background information that does not contribute to the image quality?
digital computers
noise
magnetic tape
hardware
44. What is the primary limitation with the resolution on digital images?
number of values displayed per image side
raster scan pattern
health level 7
binary machine
45. Computerized digital images are described in terms of what
bus speed
1945
ROM
number of values displayed per image side
46. Increased noise = _____ image contrast.
central processing unit
smaller
inversely
decreased
47. Noise is ____ related to contrast.
software
inversely
IR
computers
48. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
monitors and printers
voltage
voxel
large amount
49. What is the random background information that does not contribute to the image quality?
large amount
analog-to-digital converters
health level 7
noise
50. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?
edge enhancement filtering or sharpening
contrast
filtering
off
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