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Test your basic knowledge |
Digital Image Processing
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Subject
:
engineering
Instructions:
Answer 50 questions in 15 minutes.
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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. Which type of filter amplifies or deletes all but a selected range or band of frequencies and is useful in the elimination of characteristic emission peaks?
program
1970s-1990s
band-pass filtering
IR
2. Resolution is controlled by what?
data
matrix size
programs and data
bus
3. What is the information stored as magnetic variations referred to as?
increase
memory
analog-to-digital converters
IRs
4. All medical imaging is achieved with which type of computers?
band-pass filtering
inversely
digital computers
IRs
5. 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.
1960s
abacus
decreased
window
6. When subject contrast is high - the acquired data contrast will be ____.
high
noise
central processing unit
numerical value
7. What does a 1 in binary code stand for?
voxel
on
array detection
1960s
8. What input device do radiographers use on a normal basis?
array detection
increase
scanning or array detection
IRs
9. Which computers handle data composed of continuously varying electrical currents?
decrease
transverse - sagittal - and coronal
analog computers
voltage
10. Which type of filter amplifies or deletes all but the high frequencies - appears to increase contrast - and is useful in vascular imaging or digital mammo.
DICOM standard
reduces
high-pass filtering
little
11. Noise is measured as what?
software
window level
reduces
signal-to-noise ratio
12. What does a 0 in binary code stand for?
off
accentuates or suppresses
peripherals
CD or DVD
13. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
large amount
central processing unit
data
window
14. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
ROM
frequency
peripherals
filtering
15. When detectors acquire their information by ____ they are receiving info from a specific area.
magnetic tape
scanning
gray scale bit depth
inverse
16. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
number of values displayed per image side
200 - 500-1000
shades of gray
1945
17. What is the name for an 8-bit word?
bus
analog computers
digital computers
byte
18. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
voxel
matrix size
software
array detection
19. Fluoroscopic noise mostly comes from what?
electronic sources
mathematical theory - solid-state electronics - and microchip technology
signal-to-noise ratio
Input devices
20. Medical imaging is often achieved from information that has been processed by what?
program
analog-to-digital converters
low-pass - band-pass - and high-pass
noise
21. A low contrast image has a ___ frequency.
scanning or array detection
low
large amount
2^x
22. What is a square series of boxes that gives form to the image?
matrix
array detection
RAM
analog-to-digital converters
23. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.
decreased
numerical value
number of values displayed per image side
software
24. What is the name of the 'modern electronic computer'?
data
high-pass filtering
200 - 500-1000
ENIAC
25. What is the equation for determining gray scale bit depth?
pixel size
peripherals
2^x
byte
26. What is the raw data to which a Fourier Transformation is applied to create the digital image?
magnetic tape
gray scale bit depth
scanning
frequency
27. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
RAM
monitors and printers
scanning
voltage
28. Which type of filter amplifies or deletes all but a selected range or band of frequencies and is useful in the elimination of characteristic emission peaks?
matrix
band-pass filtering
monitors and printers
memory
29. DICOM imaging now includes compatibility via a database system that includes linage of the patient images with the patient's EMR. This database system is called what?
health level 7
byte
matrix
digital imaging and communication in medicine
30. Which memory can only be extracted without alteration; cannot change?
CPU - Bus
decreased
read memory
array detection
31. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
central processing unit
voxel
voltage
memory
32. Binary systems operate with a ___-symbol language.
digital computers
digital imaging and communication in medicine
filtering
two
33. There is a ___ relationship between subject contrast and acquired data contrast.
Input devices
direct
magnetic tape
CD or DVD
34. What input device do radiographers use on a normal basis?
shades of gray
IRs
pixel size
window
35. What modalities are array processors useful for?
CT and MRI
10 megabyte
data
0 - 1
36. What are devices such as keyboard - touch screen monitors - and voice-activation that you put into or connect to a computer?
byte
transverse - sagittal - and coronal
Input devices
raster scan pattern
37. What is the primary limitation with the resolution on digital images?
peripherals
data
raster scan pattern
band-pass filtering
38. Which type of filter amplifies or deletes all but the high frequencies - appears to increase contrast - and is useful in vascular imaging or digital mammo.
2^x
gray scale bit depth
high-pass filtering
decreased
39. Computer memory is often rated in terms of total ____ memory.
byte
numerical values
array processors
RAM
40. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
array detection
increase
numerical values
reduces
41. What is the primary limitation with the resolution on digital images?
analog computers
raster scan pattern
RAM - ROM
number of values displayed per image side
42. When was ENIAC invented?
1940s
1945
ROM
byte
43. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.
high
parallel - serial
CPU - Bus
direct
44. What type of memory storage devices are required for large amounts of data?
ENIAC
on
CD or DVD
matrix size
45. What is the raw data to which a Fourier Transformation is applied to create the digital image?
electronic sources
frequency
transverse - sagittal - and coronal
Fourier Transformation
46. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
progressive scanning
fine
gray scale bit depth
window
47. Which type of information consists of collected facts?
32
data
high
reduces
48. Which type of information consists of operating instructions?
program
voltage
raster scan pattern
central processing unit
49. What directs information to and from various parts of the computer?
central processing unit
detector
peripherals
direct
50. The _____ the matrix size - the better the resolution.
edge enhancement filtering or sharpening
1960s
pixel size
greater
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