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Test your basic knowledge |
Digital Image Processing
Start Test
Study First
Subject
:
engineering
Instructions:
Answer 50 questions in 15 minutes.
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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. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.
ENIAC
digital computers
bus
parallel - serial
2. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
shades of gray
32
200 - 500-1000
noise
3. Digital detectors are capable of producing ______ shades of gray.
inversely
high
1000+
data
4. What is a square series of boxes that gives form to the image?
high
matrix
central processing unit
array detection
5. What is the name for a binary digit?
read memory
noise
bit
digital imaging and communication in medicine
6. 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.
matrix
window
digital computers
reduces
7. A high contrast image has a ___ frequency.
byte
high
frequency
IR
8. Modalities differ in bit depth that is available depending on the capabilities of what?
scanning
filtering
IR
smaller
9. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?
monitors and printers
digital computers
filtering
byte
10. Noise is ____ related to contrast.
contrast
inversely
reduces
raster scan pattern
11. What input device do radiographers use on a normal basis?
voltage
slow scanning
IRs
digital computers
12. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
1970s-1990s
health level 7
matrix
fine
13. What type of scanning increases resolution slightly by scanning all 525 lines in order?
progressive scanning
digital image
direct
parallel - serial
14. What changes the pixel value by multiplication or division and controls image contrast?
analog-to-digital converters
greater
window width
window
15. Binary systems operate with a ___-symbol language.
monitors and printers
digital computers
two
software
16. 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.
peripherals
window
central processing unit
gray scale bit depth
17. What are the two ways detectors acquire information?
data
matrix
scanning or array detection
software
18. There is a ___ relationship between subject contrast and acquired data contrast.
smaller
magnetic tape
direct
Fourier Transformation
19. The _____ the matrix size - the better the resolution.
greater
1940s
data
bus
20. What determines resolution?
direct
voxel
pixel size
IRs
21. A high S/N indicates ___ noise in the image.
direct
program
fine
little
22. What is high-pass filtering also called?
pixel size
edge enhancement filtering or sharpening
TV camera
RAM - ROM
23. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
200 - 500-1000
voltage
0 - 1
fine
24. Around what time did digital computerization come out for CT and US?
band-pass filtering
1970s-1990s
memory
slow scanning
25. Increased noise = _____ image contrast.
RAM - ROM
peripherals
decreased
pixel size
26. What determines resolution?
digital image
TV camera
increase
pixel size
27. What is the measure of the differences between the data values referred to as?
filtering
accentuates or suppresses
contrast
numerical value
28. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?
magnetic tape
gray scale bit depth
scanning
Fourier Transformation
29. What is an individual matrix box or picture element?
memory
analog computers
pixel
window
30. If the window level increases - density will _____.
ENIAC
increase
central processing unit
1960s
31. What is an individual matrix box or picture element?
numerical value
pixel
abacus
expansion or compression
32. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
two
RAM
window level
10 megabyte
33. A low contrast image has a ___ frequency.
software
digital computers
analog-to-digital converters
low
34. What input device do radiographers use on a normal basis?
IRs
transverse - sagittal - and coronal
bus speed
off
35. Fluoroscopic noise mostly comes from what?
electronic sources
expansion or compression
smoothing
central processing unit
36. What does a 0 in binary code stand for?
off
array detection
computers
ROM
37. Which computers handle data composed of continuously varying electrical currents?
analog computers
low
direct
slow scanning
38. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
scanning
progressive scanning
voxel
computer - radiographer
39. 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?
bus
binary machine
band-pass filtering
increase
40. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
Input devices
1000+
smoothing
high
41. The computer either ____ or ____ selected frequencies during the filtering process.
analog computers
byte
program
accentuates or suppresses
42. When subject contrast is high - the acquired data contrast will be ____.
1940s
high
peripherals
pixel
43. What is a specialized computer that functions as a peripheral and uses CPU memory to perform mathematical operations at extremely high speed?
array processors
IR
slow scanning
greater
44. What is the frequency response of the incoming signal called?
accentuates or suppresses
matrix
high
bandwidth
45. Digital detectors are capable of producing ______ shades of gray.
digital computers
off
peripherals
1000+
46. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
1000+
data
CD or DVD
large amount
47. What directs information to and from various parts of the computer?
1960s
array processors
bandwidth
central processing unit
48. What are the 3 classifications of digitized image filters?
200 - 500-1000
frequency - contrast - and noise
window level
low-pass - band-pass - and high-pass
49. Who or What is responsible for density changes on a digital image? On a manual image
edge enhancement filtering or sharpening
decrease
frequency - contrast - and noise
computer - radiographer
50. What is the information stored as magnetic variations referred to as?
memory
on
software
array detection
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