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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 are the two most common output devices?
analog computers
1960s
monitors and printers
IR
2. In what time period did mathematical theory and solid-state electronics come out?
on
1940s
frequency
digital imaging and communication in medicine
3. A low contrast image has a ___ frequency.
numerical values
programs and data
low
on
4. What changes the pixel value by addition or subtraction and controls image density?
window level
inverse
number of values displayed per image side
analog-to-digital converters
5. What was the earliest computer device called?
window width
abacus
scanning
accentuates or suppresses
6. What is the 'noisiest' component of a digital system?
window
frequency - contrast - and noise
direct
TV camera
7. Which computers handle data composed of definite quantities of current?
frequency - contrast - and noise
digital computers
high-pass filtering
1-2 lp/mm
8. 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?
transverse - sagittal - and coronal
frequency
shades of gray
low
9. What is the raw data to which a Fourier Transformation is applied to create the digital image?
frequency
CT and MRI
window
array processors
10. Around what time did digital computerization come out for CT and US?
1970s-1990s
magnetic tape
CT and MRI
binary machine
11. Window width and contrast have an ____ relationship.
signal-to-noise ratio
inverse
numerical value
1-2 lp/mm
12. Computer memory is often rated in terms of total ____ memory.
CPU - Bus
IR
matrix
byte
13. If window width increases - image contrast will ____.
computers
decrease
memory
expansion or compression
14. Which memory replaces new information with the old; can change?
inversely
1940s
digital image
write memory
15. What is the name for an 8-bit word?
10 megabyte
low
CD or DVD
byte
16. The number of shades of gray is determined by what?
CT and MRI
gray scale bit depth
0 - 1
high
17. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?
RAM - ROM
analog computers
filtering
raster scan pattern
18. What modalities are array processors useful for?
CT and MRI
electronic sources
array detection
low
19. When subject contrast is high - the acquired data contrast will be ____.
IRs
high
digital image
shades of gray
20. The computer either ____ or ____ selected frequencies during the filtering process.
low-pass - band-pass - and high-pass
accentuates or suppresses
central processing unit
IR
21. What type of scanning increases resolution but can't be used in real-time dynamic studies?
filtering
slow scanning
Input devices
bandwidth
22. What is the random background information that does not contribute to the image quality?
voltage
noise
scanning or array detection
CD or DVD
23. What type of memory storage devices are required for large amounts of data?
little
CD or DVD
write memory
bus
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
two
two
25. What input device do radiographers use on a normal basis?
byte
low-pass filter
IRs
frequency - contrast - and noise
26. Fluoroscopic noise mostly comes from what?
pixel
electronic sources
memory
transverse - sagittal - and coronal
27. What is the equation for determining gray scale bit depth?
read memory
smoothing
bit
2^x
28. What is the 'heart' of every computer?
health level 7
central processing unit
bus
bandwidth
29. A low contrast image has a ___ frequency.
low
high
central processing unit
programs and data
30. When detectors acquire their information by ____ they are receiving info from a specific area.
transverse - sagittal - and coronal
fine
scanning
numerical values
31. Computers operate from ____ ____ language.
central processing unit
byte
binary machine
bandwidth
32. When detectors acquire their information through ____ they are receiving all the info at once.
array detection
numerical value
bus
scanning or array detection
33. Which memory replaces new information with the old; can change?
reduces
slow scanning
write memory
binary machine
34. The _____ the matrix size - the better the resolution.
program
digital computers
array detection
greater
35. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
1940s
high
200 - 500-1000
digital image
36. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?
Fourier Transformation
computers
binary machine
filtering
37. Increased noise = _____ image contrast.
electronic sources
decreased
gray scale bit depth
window level
38. Noise is ____ related to contrast.
frequency - contrast - and noise
peripherals
abacus
inversely
39. What provides specific instructions for calculations and sequential steps to be followed?
software
digital computers
2^x
byte
40. What are the 3 classifications of digitized image filters?
hardware
low-pass - band-pass - and high-pass
noise
array processors
41. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
RAM
raster scan pattern
edge enhancement filtering or sharpening
two
42. Around what time did digital computerization come out for CT and US?
read memory
1970s-1990s
data
RAM
43. What is high-pass filtering also called?
numerical value
electronic sources
edge enhancement filtering or sharpening
low-pass - band-pass - and high-pass
44. A __ _____ disk will store over 10000000 bytes of information.
increase
gray scale bit depth
voxel
10 megabyte
45. What is the frequency response of the incoming signal called?
programs and data
byte
bandwidth
high-pass filtering
46. A high contrast image has a ___ frequency.
high
program
decreased
CPU - Bus
47. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
voltage
central processing unit
edge enhancement filtering or sharpening
voxel
48. What provides specific instructions for calculations and sequential steps to be followed?
CPU - Bus
program
smaller
software
49. What are the two ways detectors acquire information?
scanning or array detection
transverse - sagittal - and coronal
program
RAM
50. A larger matrix provides ____ pixels.
TV camera
scanning
smaller
inversely