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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. The human visual range is ___ or fewer shades of gray.
Input devices
1-2 lp/mm
filtering
32
2. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
scanning or array detection
bus
smaller
progressive scanning
3. What input device do radiographers use on a normal basis?
accentuates or suppresses
RAM - ROM
digital image
IRs
4. Which memory replaces new information with the old; can change?
parallel - serial
RAM - ROM
software
write memory
5. What is a square series of boxes that gives form to the image?
matrix
write memory
read memory
CT and MRI
6. What is the mathematical algorithm used to create all medical images?
32
voltage
Fourier Transformation
low-pass filter
7. What type of scanning increases resolution but can't be used in real-time dynamic studies?
1940s
bandwidth
smaller
slow scanning
8. What is the name for an 8-bit word?
smaller
matrix
analog computers
byte
9. What directs information to and from various parts of the computer?
decreased
parallel - serial
byte
central processing unit
10. There is a ___ relationship between subject contrast and acquired data contrast.
direct
contrast
0 - 1
DICOM standard
11. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
RAM - ROM
window level
detector
matrix
12. What is the 'heart' of every computer?
central processing unit
window width
health level 7
DICOM standard
13. What is an individual matrix box or picture element?
pixel
smoothing
voltage
1960s
14. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
smoothing
low
parallel - serial
voxel
15. What is the equation for determining gray scale bit depth?
data
scanning or array detection
2^x
two
16. Which memory can only be extracted without alteration; cannot change?
read memory
Input devices
numerical values
low-pass filter
17. Digital detectors are capable of producing ______ shades of gray.
1000+
digital computers
contrast
10 megabyte
18. The number of shades of gray is determined by what?
hardware
inversely
gray scale bit depth
RAM
19. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
2^x
ROM
high-pass filtering
contrast
20. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
1-2 lp/mm
transverse - sagittal - and coronal
bus
window level
21. 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?
bus
magnetic tape
filtering
transverse - sagittal - and coronal
22. Modalities differ in bit depth that is available depending on the capabilities of what?
IR
1000+
number of values displayed per image side
progressive scanning
23. Fluoroscopic noise mostly comes from what?
electronic sources
frequency
digital computers
TV camera
24. Changes in window width are sometimes called gray scale ____ or ____.
signal-to-noise ratio
central processing unit
expansion or compression
window level
25. When was ENIAC invented?
1945
scanning or array detection
on
raster scan pattern
26. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?
filtering
matrix
low
1-2 lp/mm
27. In what time period did microchip technology come out?
RAM
1960s
peripherals
expansion or compression
28. Because electrical currents are understood as being either on or off - the binary system consists of information recorded as either a _ for off or a _ for on.
bandwidth
inverse
0 - 1
noise
29. What is the name of the 'modern electronic computer'?
shades of gray
digital imaging and communication in medicine
mathematical theory - solid-state electronics - and microchip technology
ENIAC
30. Fluoroscopic noise mostly comes from what?
software
edge enhancement filtering or sharpening
electronic sources
increase
31. Medical imaging is often achieved from information that has been processed by what?
analog-to-digital converters
1-2 lp/mm
band-pass filtering
smaller
32. What are the two types of information computers use?
peripherals
RAM - ROM
frequency
programs and data
33. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.
TV camera
low-pass filter
bandwidth
matrix size
34. What is an image that has been converted into numerical values for transmission or processing?
health level 7
high
Fourier Transformation
digital image
35. All medical imaging is achieved with which type of computers?
digital computers
health level 7
program
frequency - contrast - and noise
36. Noise is measured as what?
data
window
2^x
signal-to-noise ratio
37. If window width increases - image contrast will ____.
decrease
shades of gray
byte
array processors
38. If the window level increases - density will _____.
fine
bandwidth
gray scale bit depth
increase
39. What is the system of conductors that connects the various components of a computer system and permits the CPU to accept inputs from any point along the conductor?
bus
expansion or compression
32
binary machine
40. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
smaller
pixel
voxel
accentuates or suppresses
41. Increased noise = _____ image contrast.
memory
band-pass filtering
decreased
window
42. The human visual range is ___ or fewer shades of gray.
10 megabyte
direct
32
1-2 lp/mm
43. Which type of information consists of collected facts?
direct
programs and data
low-pass filter
data
44. Binary systems operate with a ___-symbol language.
two
2^x
magnetic tape
200 - 500-1000
45. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.
CT and MRI
1-2 lp/mm
numerical value
write memory
46. What are the 3 classifications of digitized image filters?
decreased
2^x
32
low-pass - band-pass - and high-pass
47. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
binary machine
central processing unit
ROM
noise
48. What does DICOM stand for?
frequency
digital imaging and communication in medicine
computer - radiographer
ENIAC
49. What is the name for a binary digit?
bit
off
1940s
digital computers
50. Who or What is responsible for density changes on a digital image? On a manual image
computer - radiographer
inverse
peripherals
mathematical theory - solid-state electronics - and microchip technology