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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 is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
byte
peripherals
smoothing
data
2. What is the information stored as magnetic variations referred to as?
binary machine
CPU - Bus
frequency - contrast - and noise
memory
3. Resolution is controlled by what?
high-pass filtering
two
read memory
matrix size
4. If window width increases - image contrast will ____.
two
greater
decrease
RAM - ROM
5. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
bit
window level
voxel
numerical values
6. What is the name of the 'modern electronic computer'?
ENIAC
Input devices
CT and MRI
1970s-1990s
7. The human visual range is ___ or fewer shades of gray.
CPU - Bus
32
slow scanning
RAM - ROM
8. Digital detectors are capable of producing ______ shades of gray.
Fourier Transformation
scanning
1000+
200 - 500-1000
9. What does a 0 in binary code stand for?
accentuates or suppresses
low
off
central processing unit
10. What input device do radiographers use on a normal basis?
IRs
edge enhancement filtering or sharpening
low-pass - band-pass - and high-pass
band-pass filtering
11. The computer either ____ or ____ selected frequencies during the filtering process.
digital imaging and communication in medicine
monitors and printers
computer - radiographer
accentuates or suppresses
12. Computers operate from ____ ____ language.
program
1960s
binary machine
CD or DVD
13. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.
Input devices
inversely
high
numerical value
14. When was ENIAC invented?
central processing unit
1945
little
byte
15. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
direct
Fourier Transformation
ROM
progressive scanning
16. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
accentuates or suppresses
byte
bus
data
17. When was ENIAC invented?
electronic sources
smaller
1945
CT and MRI
18. What is the name of the 'modern electronic computer'?
noise
ENIAC
greater
filtering
19. 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.
inversely
data
central processing unit
window
20. What is the raw data to which a Fourier Transformation is applied to create the digital image?
abacus
data
frequency
voltage
21. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
ENIAC
edge enhancement filtering or sharpening
RAM - ROM
scanning
22. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.
parallel - serial
ROM
numerical values
200 - 500-1000
23. What changes the pixel value by addition or subtraction and controls image density?
window level
filtering
1945
two
24. A high contrast image has a ___ frequency.
high
frequency - contrast - and noise
CT and MRI
digital image
25. What is the raw data to which a Fourier Transformation is applied to create the digital image?
contrast
frequency
1970s-1990s
matrix
26. What provides specific instructions for calculations and sequential steps to be followed?
software
inverse
1945
analog computers
27. What type of scanning increases resolution slightly by scanning all 525 lines in order?
array detection
large amount
1940s
progressive scanning
28. What is a specialized computer that functions as a peripheral and uses CPU memory to perform mathematical operations at extremely high speed?
read memory
IRs
window
array processors
29. What was the earliest computer device called?
numerical value
software
voltage
abacus
30. There is a ___ relationship between subject contrast and acquired data contrast.
number of values displayed per image side
direct
progressive scanning
10 megabyte
31. What is the 'noisiest' component of a digital system?
TV camera
frequency - contrast - and noise
analog-to-digital converters
low-pass - band-pass - and high-pass
32. What does DICOM stand for?
digital imaging and communication in medicine
analog computers
hardware
IR
33. What are the 3 classifications of digitized image filters?
high
32
edge enhancement filtering or sharpening
low-pass - band-pass - and high-pass
34. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
contrast
1-2 lp/mm
raster scan pattern
numerical values
35. What determines resolution?
reduces
pixel size
2^x
low-pass filter
36. What is critical to how fast the computer system can function?
bus speed
bit
parallel - serial
software
37. What 3 things were required prior to digital computer applications in medical imaging?
mathematical theory - solid-state electronics - and microchip technology
expansion or compression
200 - 500-1000
byte
38. What is the name for a binary digit?
bit
band-pass filtering
raster scan pattern
magnetic tape
39. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?
filtering
reduces
high
low-pass filter
40. Noise is measured as what?
scanning or array detection
signal-to-noise ratio
inversely
digital imaging and communication in medicine
41. What are the 3 classifications of digitized image filters?
low-pass - band-pass - and high-pass
electronic sources
CT and MRI
hardware
42. Modalities differ in bit depth that is available depending on the capabilities of what?
1945
slow scanning
IR
health level 7
43. What are the two ways detectors acquire information?
voltage
scanning or array detection
memory
read memory
44. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
digital imaging and communication in medicine
edge enhancement filtering or sharpening
bus
low-pass filter
45. 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.
noise
raster scan pattern
window
contrast
46. Increased noise = _____ image contrast.
byte
two
decreased
frequency
47. What is a square series of boxes that gives form to the image?
CD or DVD
matrix
array detection
200 - 500-1000
48. Which computers handle data composed of continuously varying electrical currents?
analog computers
1000+
inverse
1000+
49. What is the measure of the differences between the data values referred to as?
contrast
program
bus
10 megabyte
50. What are devices that process information?
TV camera
digital computers
CT and MRI
computers