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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?
frequency
window level
contrast
computer - radiographer
2. What is the information stored as magnetic variations referred to as?
Fourier Transformation
1970s-1990s
write memory
memory
3. Which computers handle data composed of definite quantities of current?
digital image
reduces
CD or DVD
digital computers
4. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
ROM
low-pass filter
memory
on
5. Noise is measured as what?
bus
1000+
gray scale bit depth
signal-to-noise ratio
6. There is a ___ relationship between subject contrast and acquired data contrast.
program
window
direct
voxel
7. Resolution is controlled by what?
matrix size
contrast
bus
binary machine
8. What is the primary limitation with the resolution on digital images?
raster scan pattern
memory
2^x
Input devices
9. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
IRs
on
high
RAM
10. What is the equation for determining gray scale bit depth?
bus
2^x
monitors and printers
large amount
11. Changes in window width are sometimes called gray scale ____ or ____.
scanning
high
decreased
expansion or compression
12. Computer equipment is called what?
1000+
contrast
on
hardware
13. What is the frequency response of the incoming signal called?
low-pass - band-pass - and high-pass
expansion or compression
bandwidth
parallel - serial
14. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
band-pass filtering
program
low
RAM - ROM
15. Which type of information consists of collected facts?
smaller
bit
data
CD or DVD
16. What changes the pixel value by multiplication or division and controls image contrast?
IRs
byte
1-2 lp/mm
window width
17. The number of shades of gray is determined by what?
filtering
1970s-1990s
noise
gray scale bit depth
18. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
200 - 500-1000
abacus
expansion or compression
low-pass - band-pass - and high-pass
19. When was ENIAC invented?
greater
voxel
1945
1970s-1990s
20. What input device do radiographers use on a normal basis?
detector
digital computers
IRs
electronic sources
21. The ____ is the heart of the computer while the ___ is the vessels.
expansion or compression
matrix
CPU - Bus
RAM
22. What directs information to and from various parts of the computer?
large amount
central processing unit
window level
health level 7
23. Who or What is responsible for density changes on a digital image? On a manual image
computer - radiographer
high
10 megabyte
digital computers
24. What is the name for an 8-bit word?
mathematical theory - solid-state electronics - and microchip technology
byte
CT and MRI
RAM
25. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.
CT and MRI
shades of gray
pixel size
numerical value
26. Which memory can only be extracted without alteration; cannot change?
hardware
CPU - Bus
read memory
number of values displayed per image side
27. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?
200 - 500-1000
peripherals
RAM
matrix size
28. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
1970s-1990s
smoothing
contrast
peripherals
29. What provides specific instructions for calculations and sequential steps to be followed?
software
progressive scanning
CPU - Bus
digital image
30. Around what time did digital computerization come out for CT and US?
write memory
CPU - Bus
1970s-1990s
digital computers
31. What are devices that process information?
noise
voltage
shades of gray
computers
32. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.
high-pass filtering
numerical value
hardware
matrix size
33. Around what time did digital computerization come out for CT and US?
2^x
filtering
low-pass filter
1970s-1990s
34. Window width and contrast have an ____ relationship.
inverse
1960s
direct
32
35. What type of scanning increases resolution slightly by scanning all 525 lines in order?
progressive scanning
IR
bus
off
36. When detectors acquire their information through ____ they are receiving all the info at once.
DICOM standard
filtering
computers
array detection
37. What are the two types of information computers use?
pixel size
pixel size
write memory
programs and data
38. What 3 things were required prior to digital computer applications in medical imaging?
abacus
abacus
mathematical theory - solid-state electronics - and microchip technology
array detection
39. If window width increases - image contrast will ____.
software
pixel
decrease
analog-to-digital converters
40. Which computers handle data composed of definite quantities of current?
smaller
10 megabyte
1-2 lp/mm
digital computers
41. What type of memory storage devices are required for large amounts of data?
1945
CD or DVD
pixel size
digital computers
42. Computer memory is often rated in terms of total ____ memory.
large amount
voxel
contrast
byte
43. What input device do radiographers use on a normal basis?
CPU - Bus
band-pass filtering
IRs
programs and data
44. What type of scanning increases resolution but can't be used in real-time dynamic studies?
hardware
central processing unit
digital computers
slow scanning
45. 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?
DICOM standard
array processors
software
byte
46. What is the measure of the differences between the data values referred to as?
monitors and printers
contrast
greater
scanning
47. When subject contrast is high - the acquired data contrast will be ____.
voxel
peripherals
mathematical theory - solid-state electronics - and microchip technology
high
48. What does DICOM stand for?
1-2 lp/mm
ENIAC
high
digital imaging and communication in medicine
49. What determines resolution?
CD or DVD
2^x
high-pass filtering
pixel size
50. Noise is ____ related to contrast.
inversely
computer - radiographer
high
decrease
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