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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 provides specific instructions for calculations and sequential steps to be followed?
computer - radiographer
software
TV camera
pixel
2. What does a 0 in binary code stand for?
off
number of values displayed per image side
band-pass filtering
RAM - ROM
3. 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?
signal-to-noise ratio
read memory
hardware
transverse - sagittal - and coronal
4. What was the earliest computer device called?
on
number of values displayed per image side
decrease
abacus
5. The _____ the matrix size - the better the resolution.
high-pass filtering
inverse
greater
2^x
6. Which type of information consists of collected facts?
voltage
bandwidth
data
digital image
7. What directs information to and from various parts of the computer?
inverse
array processors
central processing unit
peripherals
8. 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.
transverse - sagittal - and coronal
RAM
window
low-pass - band-pass - and high-pass
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.
noise
high
low-pass filter
array detection
10. DICOM imaging now includes compatibility via a database system that includes linage of the patient images with the patient's EMR. This database system is called what?
raster scan pattern
health level 7
large amount
decrease
11. Which computers handle data composed of continuously varying electrical currents?
two
matrix size
health level 7
analog computers
12. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
RAM - ROM
expansion or compression
detector
peripherals
13. 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?
magnetic tape
transverse - sagittal - and coronal
decreased
magnetic tape
14. What is the 'noisiest' component of a digital system?
abacus
TV camera
hardware
numerical value
15. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
numerical values
voltage
1970s-1990s
RAM - ROM
16. What is a square series of boxes that gives form to the image?
central processing unit
accentuates or suppresses
gray scale bit depth
matrix
17. What determines resolution?
0 - 1
pixel size
greater
reduces
18. What are the two types of information computers use?
bus
programs and data
raster scan pattern
low
19. Modalities differ in bit depth that is available depending on the capabilities of what?
analog-to-digital converters
write memory
IR
bus
20. Medical imaging is often achieved from information that has been processed by what?
bus
analog-to-digital converters
bandwidth
peripherals
21. What is the primary limitation with the resolution on digital images?
10 megabyte
raster scan pattern
voxel
high-pass filtering
22. Which memory can only be extracted without alteration; cannot change?
low-pass - band-pass - and high-pass
read memory
RAM
smoothing
23. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
mathematical theory - solid-state electronics - and microchip technology
analog computers
transverse - sagittal - and coronal
fine
24. Binary systems operate with a ___-symbol language.
two
1-2 lp/mm
slow scanning
monitors and printers
25. Computer equipment is called what?
peripherals
hardware
10 megabyte
IR
26. Digital detectors are capable of producing ______ shades of gray.
voltage
matrix
1000+
monitors and printers
27. The computer either ____ or ____ selected frequencies during the filtering process.
smoothing
accentuates or suppresses
software
frequency - contrast - and noise
28. What is a specialized computer that functions as a peripheral and uses CPU memory to perform mathematical operations at extremely high speed?
window width
digital computers
low-pass filter
array processors
29. Each pixel is capable of representing a wide range of what?
matrix size
shades of gray
central processing unit
frequency - contrast - and noise
30. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?
magnetic tape
analog computers
byte
shades of gray
31. What permit input/output of information to or from the CPU?
software
peripherals
digital image
expansion or compression
32. Digitalization of analog information (increases / reduces) the quality and quantity of information?
digital computers
0 - 1
filtering
reduces
33. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
voxel
RAM
inverse
digital imaging and communication in medicine
34. What type of scanning increases resolution but can't be used in real-time dynamic studies?
window
slow scanning
analog computers
ROM
35. Computer memory is often rated in terms of total ____ memory.
IR
matrix size
byte
1940s
36. What is the frequency response of the incoming signal called?
reduces
noise
bandwidth
ROM
37. What does a 1 in binary code stand for?
on
0 - 1
read memory
filtering
38. What changes the pixel value by addition or subtraction and controls image density?
digital imaging and communication in medicine
scanning
noise
window level
39. What 3 things were required prior to digital computer applications in medical imaging?
mathematical theory - solid-state electronics - and microchip technology
voltage
health level 7
bus speed
40. The human visual range is ___ or fewer shades of gray.
bus
abacus
pixel size
32
41. What type of memory storage devices are required for large amounts of data?
CD or DVD
low
computers
200 - 500-1000
42. A high contrast image has a ___ frequency.
greater
high
inversely
number of values displayed per image side
43. A __ _____ disk will store over 10000000 bytes of information.
0 - 1
10 megabyte
Input devices
reduces
44. What changes the pixel value by multiplication or division and controls image contrast?
decreased
scanning or array detection
window width
shades of gray
45. Noise is measured as what?
magnetic tape
signal-to-noise ratio
numerical values
1-2 lp/mm
46. What is high-pass filtering also called?
hardware
high
matrix size
edge enhancement filtering or sharpening
47. A low contrast image has a ___ frequency.
band-pass filtering
little
smoothing
low
48. What are the two ways detectors acquire information?
scanning or array detection
high
direct
noise
49. There is a ___ relationship between subject contrast and acquired data contrast.
direct
analog-to-digital converters
TV camera
numerical value
50. Window width and contrast have an ____ relationship.
peripherals
frequency - contrast - and noise
analog computers
inverse
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