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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. Changes in window width are sometimes called gray scale ____ or ____.
frequency - contrast - and noise
array processors
pixel size
expansion or compression
2. What is the name for a binary digit?
little
analog computers
window width
bit
3. 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?
byte
high
bit
transverse - sagittal - and coronal
4. A low contrast image has a ___ frequency.
32
low
scanning
signal-to-noise ratio
5. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
programs and data
RAM - ROM
computers
window width
6. A high contrast image has a ___ frequency.
high
filtering
central processing unit
program
7. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
abacus
high
fine
little
8. Computer memory is often rated in terms of total ____ memory.
pixel size
inversely
progressive scanning
byte
9. Increased noise = _____ image contrast.
electronic sources
progressive scanning
low
decreased
10. What is the mathematical algorithm used to create all medical images?
Fourier Transformation
voxel
contrast
DICOM standard
11. 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
fine
IR
central processing unit
12. What is the measure of the differences between the data values referred to as?
contrast
high
voxel
analog-to-digital converters
13. Who or What is responsible for density changes on a digital image? On a manual image
low
computer - radiographer
high-pass filtering
mathematical theory - solid-state electronics - and microchip technology
14. Which type of information consists of collected facts?
array processors
edge enhancement filtering or sharpening
electronic sources
data
15. What are the 3 classifications of digitized image filters?
fine
frequency - contrast - and noise
ROM
low-pass - band-pass - and high-pass
16. Digitalization of analog information (increases / reduces) the quality and quantity of information?
CD or DVD
number of values displayed per image side
reduces
pixel size
17. The human visual range is ___ or fewer shades of gray.
32
large amount
frequency
two
18. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
large amount
high
read memory
peripherals
19. What is the name of the 'modern electronic computer'?
ENIAC
transverse - sagittal - and coronal
slow scanning
bus
20. What is a square series of boxes that gives form to the image?
accentuates or suppresses
write memory
matrix
mathematical theory - solid-state electronics - and microchip technology
21. 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.
contrast
0 - 1
gray scale bit depth
memory
22. What are the two most common output devices?
monitors and printers
computers
array processors
bus speed
23. Which computers handle data composed of definite quantities of current?
software
digital computers
DICOM standard
32
24. What is critical to how fast the computer system can function?
high
1-2 lp/mm
bus speed
memory
25. The _____ the matrix size - the better the resolution.
central processing unit
greater
hardware
peripherals
26. The number of shades of gray is determined by what?
programs and data
reduces
progressive scanning
gray scale bit depth
27. What is the primary limitation with the resolution on digital images?
mathematical theory - solid-state electronics - and microchip technology
bus speed
slow scanning
raster scan pattern
28. Medical imaging is often achieved from information that has been processed by what?
window
IR
analog-to-digital converters
high
29. Which type of information consists of operating instructions?
inversely
high
program
magnetic tape
30. When was ENIAC invented?
computer - radiographer
Input devices
high-pass filtering
1945
31. 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
ROM
electronic sources
bit
32. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
1940s
detector
smoothing
RAM
33. In what time period did mathematical theory and solid-state electronics come out?
little
smoothing
1940s
decrease
34. Noise is measured as what?
greater
write memory
10 megabyte
signal-to-noise ratio
35. Each pixel is capable of representing a wide range of what?
scanning or array detection
smaller
200 - 500-1000
shades of gray
36. The computer either ____ or ____ selected frequencies during the filtering process.
software
data
accentuates or suppresses
memory
37. What type of memory storage devices are required for large amounts of data?
inverse
digital computers
CD or DVD
data
38. If the window level increases - density will _____.
CT and MRI
increase
window level
raster scan pattern
39. There is a ___ relationship between subject contrast and acquired data contrast.
direct
bus speed
smaller
TV camera
40. What is the frequency response of the incoming signal called?
32
Fourier Transformation
bandwidth
200 - 500-1000
41. The quality of the data acquired from the IR is measured by what three data characteristics?
1000+
fine
frequency - contrast - and noise
increase
42. When was ENIAC invented?
off
RAM
1945
shades of gray
43. What type of memory storage devices are required for large amounts of data?
CD or DVD
band-pass filtering
bus speed
bandwidth
44. Binary systems operate with a ___-symbol language.
hardware
smaller
two
1000+
45. Which computers handle data composed of definite quantities of current?
window width
monitors and printers
software
digital computers
46. What does a 1 in binary code stand for?
array processors
on
electronic sources
filtering
47. What is an image that has been converted into numerical values for transmission or processing?
analog-to-digital converters
central processing unit
byte
digital image
48. The ____ is the heart of the computer while the ___ is the vessels.
window level
health level 7
ROM
CPU - Bus
49. When subject contrast is high - the acquired data contrast will be ____.
Input devices
high
software
array detection
50. What does a 0 in binary code stand for?
data
off
parallel - serial
array detection