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Test your basic knowledge |
Digital Image Processing
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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. What type of scanning increases resolution slightly by scanning all 525 lines in order?
read memory
progressive scanning
high
raster scan pattern
2. When detectors acquire their information by ____ they are receiving info from a specific area.
scanning
programs and data
digital computers
digital imaging and communication in medicine
3. What is the mathematical algorithm used to create all medical images?
Fourier Transformation
1945
central processing unit
hardware
4. What is high-pass filtering also called?
off
edge enhancement filtering or sharpening
frequency - contrast - and noise
Fourier Transformation
5. 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.
slow scanning
Fourier Transformation
0 - 1
window
6. Increased noise = _____ image contrast.
array processors
off
computers
decreased
7. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
large amount
parallel - serial
on
array detection
8. What are the two ways detectors acquire information?
voltage
1-2 lp/mm
scanning or array detection
central processing unit
9. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
numerical values
contrast
1960s
signal-to-noise ratio
10. When subject contrast is high - the acquired data contrast will be ____.
off
high
progressive scanning
software
11. Each pixel is capable of representing a wide range of what?
frequency - contrast - and noise
shades of gray
CT and MRI
number of values displayed per image side
12. What input device do radiographers use on a normal basis?
IRs
frequency
scanning
digital image
13. What is an image that has been converted into numerical values for transmission or processing?
shades of gray
program
digital imaging and communication in medicine
digital image
14. Which memory replaces new information with the old; can change?
scanning or array detection
write memory
1940s
software
15. Which type of information consists of operating instructions?
program
abacus
central processing unit
digital computers
16. What changes the pixel value by addition or subtraction and controls image density?
ENIAC
low
greater
window level
17. Resolution is controlled by what?
programs and data
matrix size
array detection
transverse - sagittal - and coronal
18. All medical imaging is achieved with which type of computers?
RAM
1940s
digital computers
low-pass filter
19. Computerized digital images are described in terms of what
number of values displayed per image side
two
frequency
off
20. A high S/N indicates ___ noise in the image.
window width
window level
little
0 - 1
21. What is the primary limitation with the resolution on digital images?
software
peripherals
read memory
raster scan pattern
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.
window
transverse - sagittal - and coronal
edge enhancement filtering or sharpening
raster scan pattern
23. What is required for collection of input information?
detector
Input devices
byte
scanning or array detection
24. What is a square series of boxes that gives form to the image?
CPU - Bus
matrix
noise
mathematical theory - solid-state electronics - and microchip technology
25. What are the 3 classifications of digitized image filters?
low-pass - band-pass - and high-pass
pixel
computer - radiographer
transverse - sagittal - and coronal
26. What is the equation for determining gray scale bit depth?
2^x
low
analog computers
number of values displayed per image side
27. What modalities are array processors useful for?
gray scale bit depth
CT and MRI
direct
IR
28. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
abacus
gray scale bit depth
noise
1-2 lp/mm
29. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
numerical value
off
inversely
large amount
30. Increased noise = _____ image contrast.
number of values displayed per image side
10 megabyte
CT and MRI
decreased
31. A __ _____ disk will store over 10000000 bytes of information.
10 megabyte
abacus
decrease
RAM - ROM
32. What is the 'noisiest' component of a digital system?
TV camera
slow scanning
edge enhancement filtering or sharpening
peripherals
33. Computer memory is often rated in terms of total ____ memory.
little
progressive scanning
transverse - sagittal - and coronal
byte
34. A high S/N indicates ___ noise in the image.
little
on
smoothing
window level
35. If the window level increases - density will _____.
increase
IR
RAM
scanning or array detection
36. Binary systems operate with a ___-symbol language.
Input devices
numerical values
two
transverse - sagittal - and coronal
37. What does DICOM stand for?
DICOM standard
magnetic tape
number of values displayed per image side
digital imaging and communication in medicine
38. The human visual range is ___ or fewer shades of gray.
low
pixel
32
array processors
39. What type of memory storage devices are required for large amounts of data?
decrease
bus speed
CD or DVD
high-pass filtering
40. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?
slow scanning
on
software
magnetic tape
41. What is the equation for determining gray scale bit depth?
peripherals
2^x
voxel
smoothing
42. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
mathematical theory - solid-state electronics - and microchip technology
ROM
smoothing
inverse
43. If the window level increases - density will _____.
increase
noise
reduces
software
44. What is the raw data to which a Fourier Transformation is applied to create the digital image?
software
frequency
bandwidth
transverse - sagittal - and coronal
45. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
digital image
bus
matrix
RAM
46. Which memory can only be extracted without alteration; cannot change?
numerical value
bus
read memory
write memory
47. When detectors acquire their information through ____ they are receiving all the info at once.
decrease
array detection
decrease
accentuates or suppresses
48. The quality of the data acquired from the IR is measured by what three data characteristics?
10 megabyte
frequency - contrast - and noise
decreased
Input devices
49. Each pixel is capable of representing a wide range of what?
mathematical theory - solid-state electronics - and microchip technology
read memory
bus
shades of gray
50. Modalities differ in bit depth that is available depending on the capabilities of what?
software
program
bus speed
IR
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