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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 measure of the differences between the data values referred to as?
contrast
shades of gray
voxel
gray scale bit depth
2. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.
central processing unit
CPU - Bus
smaller
parallel - serial
3. What is the 'noisiest' component of a digital system?
inverse
TV camera
numerical value
bit
4. What is an individual matrix box or picture element?
greater
pixel
10 megabyte
Fourier Transformation
5. What changes the pixel value by addition or subtraction and controls image density?
analog computers
decrease
window level
program
6. What directs information to and from various parts of the computer?
CT and MRI
1945
central processing unit
IRs
7. 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?
fine
transverse - sagittal - and coronal
numerical values
ROM
8. What permit input/output of information to or from the CPU?
IR
bus
peripherals
detector
9. The number of shades of gray is determined by what?
window
detector
gray scale bit depth
decrease
10. What is the name for an 8-bit word?
bit
central processing unit
byte
scanning
11. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
RAM - ROM
voxel
frequency - contrast - and noise
signal-to-noise ratio
12. What is the primary limitation with the resolution on digital images?
software
digital computers
inversely
raster scan pattern
13. Noise is measured as what?
reduces
CT and MRI
digital imaging and communication in medicine
signal-to-noise ratio
14. What modalities are array processors useful for?
gray scale bit depth
CT and MRI
200 - 500-1000
central processing unit
15. What is the digital standard for imaging that is designed to ensure that all equipment fro all manufacturers who choose to adhere to the standard are speaking the same computer language?
expansion or compression
1-2 lp/mm
shades of gray
DICOM standard
16. Noise is measured as what?
high
10 megabyte
signal-to-noise ratio
progressive scanning
17. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
bus
detector
electronic sources
high
18. What is a specialized computer that functions as a peripheral and uses CPU memory to perform mathematical operations at extremely high speed?
array processors
numerical value
pixel
large amount
19. What type of memory storage devices are required for large amounts of data?
hardware
CD or DVD
Input devices
contrast
20. When was ENIAC invented?
frequency
expansion or compression
1945
direct
21. Changes in window width are sometimes called gray scale ____ or ____.
decrease
RAM - ROM
expansion or compression
1945
22. What are the two ways detectors acquire information?
CT and MRI
data
scanning or array detection
0 - 1
23. All medical imaging is achieved with which type of computers?
hardware
IRs
digital computers
electronic sources
24. What is an image that has been converted into numerical values for transmission or processing?
digital image
greater
monitors and printers
digital imaging and communication in medicine
25. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
gray scale bit depth
smaller
200 - 500-1000
software
26. What type of scanning increases resolution slightly by scanning all 525 lines in order?
1-2 lp/mm
digital computers
smoothing
progressive scanning
27. What is the equation for determining gray scale bit depth?
monitors and printers
2^x
health level 7
signal-to-noise ratio
28. When subject contrast is high - the acquired data contrast will be ____.
hardware
digital imaging and communication in medicine
high
bus
29. The computer either ____ or ____ selected frequencies during the filtering process.
high-pass filtering
accentuates or suppresses
edge enhancement filtering or sharpening
large amount
30. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
central processing unit
direct
high
large amount
31. Computer programs are called what?
scanning or array detection
TV camera
software
1-2 lp/mm
32. The _____ the matrix size - the better the resolution.
window level
CT and MRI
greater
bus speed
33. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
window level
1960s
Input devices
fine
34. Which memory replaces new information with the old; can change?
on
TV camera
Fourier Transformation
write memory
35. A larger matrix provides ____ pixels.
low
programs and data
little
smaller
36. What are the two types of information computers use?
digital computers
programs and data
edge enhancement filtering or sharpening
byte
37. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.
1000+
scanning or array detection
low-pass filter
off
38. What does a 1 in binary code stand for?
IRs
computer - radiographer
fine
on
39. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?
magnetic tape
raster scan pattern
CT and MRI
program
40. Computer programs are called what?
expansion or compression
software
RAM - ROM
decreased
41. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
little
greater
data
large amount
42. What can memory be transferred as?
voltage
software
matrix
Input devices
43. The ____ is the heart of the computer while the ___ is the vessels.
software
CPU - Bus
health level 7
ROM
44. Which memory replaces new information with the old; can change?
write memory
inverse
1940s
frequency - contrast - and noise
45. What is the name for a binary digit?
large amount
two
bit
direct
46. A low contrast image has a ___ frequency.
window width
low
window
expansion or compression
47. If window width increases - image contrast will ____.
1-2 lp/mm
32
high-pass filtering
decrease
48. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
contrast
RAM - ROM
smoothing
bus
49. What is critical to how fast the computer system can function?
1945
greater
bus speed
low
50. What is the random background information that does not contribute to the image quality?
program
digital computers
little
noise