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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?
fine
CT and MRI
0 - 1
smoothing
2. What is the mathematical algorithm used to create all medical images?
reduces
smoothing
Fourier Transformation
inverse
3. What is the name for an 8-bit word?
slow scanning
low-pass filter
expansion or compression
byte
4. Fluoroscopic noise mostly comes from what?
inverse
memory
electronic sources
reduces
5. A high S/N indicates ___ noise in the image.
low
little
increase
reduces
6. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
memory
read memory
voltage
200 - 500-1000
7. Noise is measured as what?
1-2 lp/mm
signal-to-noise ratio
abacus
voltage
8. What is the 'noisiest' component of a digital system?
filtering
contrast
TV camera
slow scanning
9. What is the name for an 8-bit word?
matrix
write memory
byte
window level
10. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
1-2 lp/mm
program
parallel - serial
smaller
11. A high S/N indicates ___ noise in the image.
on
little
inversely
two
12. Computerized digital images are described in terms of what
number of values displayed per image side
contrast
software
reduces
13. What are the two most common output devices?
abacus
digital imaging and communication in medicine
monitors and printers
progressive scanning
14. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
200 - 500-1000
increase
1960s
computer - radiographer
15. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
detector
on
RAM - ROM
increase
16. What does a 0 in binary code stand for?
smoothing
central processing unit
1960s
off
17. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
pixel size
numerical values
programs and data
byte
18. Around what time did digital computerization come out for CT and US?
1970s-1990s
IRs
number of values displayed per image side
computers
19. What are devices such as keyboard - touch screen monitors - and voice-activation that you put into or connect to a computer?
window level
digital computers
central processing unit
Input devices
20. A low contrast image has a ___ frequency.
low
inversely
pixel
filtering
21. Who or What is responsible for density changes on a digital image? On a manual image
frequency - contrast - and noise
IR
smoothing
computer - radiographer
22. What is the 'heart' of every computer?
bus
scanning or array detection
central processing unit
200 - 500-1000
23. A larger matrix provides ____ pixels.
smaller
Fourier Transformation
on
accentuates or suppresses
24. What is the name for a binary digit?
edge enhancement filtering or sharpening
2^x
bit
low
25. All medical imaging is achieved with which type of computers?
decreased
digital computers
peripherals
greater
26. The ____ is the heart of the computer while the ___ is the vessels.
frequency
signal-to-noise ratio
CPU - Bus
data
27. What does a 0 in binary code stand for?
off
RAM - ROM
high
high
28. What is critical to how fast the computer system can function?
bus speed
digital image
binary machine
1940s
29. When subject contrast is high - the acquired data contrast will be ____.
high
health level 7
numerical values
decrease
30. Increased noise = _____ image contrast.
digital computers
decreased
software
Fourier Transformation
31. The human visual range is ___ or fewer shades of gray.
32
binary machine
numerical value
scanning or array detection
32. 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.
window
TV camera
monitors and printers
byte
33. Computer equipment is called what?
digital imaging and communication in medicine
software
hardware
1960s
34. What is the frequency response of the incoming signal called?
bandwidth
signal-to-noise ratio
CT and MRI
1000+
35. A high contrast image has a ___ frequency.
software
high
expansion or compression
Input devices
36. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?
peripherals
Fourier Transformation
digital computers
magnetic tape
37. Resolution is controlled by what?
Fourier Transformation
matrix size
smaller
raster scan pattern
38. What are the 3 classifications of digitized image filters?
low-pass - band-pass - and high-pass
on
direct
magnetic tape
39. Noise is ____ related to contrast.
high
detector
transverse - sagittal - and coronal
inversely
40. The _____ the matrix size - the better the resolution.
program
array processors
CPU - Bus
greater
41. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
inverse
2^x
large amount
voxel
42. What modalities are array processors useful for?
voltage
CT and MRI
gray scale bit depth
array detection
43. Computers operate from ____ ____ language.
IR
binary machine
transverse - sagittal - and coronal
RAM
44. What is required for collection of input information?
hardware
bandwidth
RAM
detector
45. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
1-2 lp/mm
analog computers
DICOM standard
10 megabyte
46. What type of scanning increases resolution slightly by scanning all 525 lines in order?
expansion or compression
digital computers
progressive scanning
digital imaging and communication in medicine
47. What are the two types of information computers use?
high
noise
programs and data
DICOM standard
48. Window width and contrast have an ____ relationship.
low-pass filter
IR
inverse
digital imaging and communication in medicine
49. The computer either ____ or ____ selected frequencies during the filtering process.
hardware
shades of gray
accentuates or suppresses
200 - 500-1000
50. What can memory be transferred as?
high
digital computers
voltage
progressive scanning