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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. 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.
greater
high
electronic sources
window
2. Computers operate from ____ ____ language.
data
low
binary machine
digital computers
3. When subject contrast is high - the acquired data contrast will be ____.
monitors and printers
contrast
digital imaging and communication in medicine
high
4. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
filtering
low-pass - band-pass - and high-pass
bus
inversely
5. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
greater
raster scan pattern
RAM - ROM
DICOM standard
6. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
CPU - Bus
smaller
transverse - sagittal - and coronal
bus
7. What was the earliest computer device called?
greater
abacus
1940s
32
8. When subject contrast is high - the acquired data contrast will be ____.
ROM
high
computers
matrix size
9. 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?
ROM
transverse - sagittal - and coronal
signal-to-noise ratio
binary machine
10. Computer programs are called what?
hardware
peripherals
software
memory
11. What are devices such as keyboard - touch screen monitors - and voice-activation that you put into or connect to a computer?
computer - radiographer
inverse
TV camera
Input devices
12. A high S/N indicates ___ noise in the image.
bus
little
shades of gray
increase
13. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
1000+
fine
array detection
RAM
14. In what time period did mathematical theory and solid-state electronics come out?
ROM
shades of gray
1940s
CPU - Bus
15. Who or What is responsible for density changes on a digital image? On a manual image
window width
decreased
central processing unit
computer - radiographer
16. Which memory can only be extracted without alteration; cannot change?
ROM
1000+
read memory
array processors
17. What is the primary limitation with the resolution on digital images?
raster scan pattern
1970s-1990s
peripherals
TV camera
18. What are the 3 classifications of digitized image filters?
decreased
monitors and printers
low-pass - band-pass - and high-pass
ENIAC
19. What type of scanning increases resolution but can't be used in real-time dynamic studies?
ENIAC
increase
IR
slow scanning
20. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
central processing unit
smoothing
voltage
software
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.
ROM
inverse
0 - 1
direct
22. What type of scanning increases resolution slightly by scanning all 525 lines in order?
central processing unit
1000+
bus speed
progressive scanning
23. The quality of the data acquired from the IR is measured by what three data characteristics?
off
digital imaging and communication in medicine
frequency - contrast - and noise
ENIAC
24. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
bit
window
inversely
large amount
25. What modalities are array processors useful for?
memory
1-2 lp/mm
ENIAC
CT and MRI
26. Computerized digital images are described in terms of what
hardware
pixel
number of values displayed per image side
software
27. What directs information to and from various parts of the computer?
low-pass filter
central processing unit
software
byte
28. What is required for collection of input information?
off
progressive scanning
detector
filtering
29. 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?
low-pass - band-pass - and high-pass
1940s
fine
band-pass filtering
30. If the window level increases - density will _____.
high-pass filtering
increase
smaller
scanning
31. Which memory replaces new information with the old; can change?
write memory
frequency
CT and MRI
peripherals
32. What is a specialized computer that functions as a peripheral and uses CPU memory to perform mathematical operations at extremely high speed?
filtering
noise
array processors
matrix
33. A high contrast image has a ___ frequency.
high
computers
frequency
digital computers
34. The human visual range is ___ or fewer shades of gray.
band-pass filtering
32
scanning or array detection
parallel - serial
35. All medical imaging is achieved with which type of computers?
digital computers
band-pass filtering
software
expansion or compression
36. What type of memory storage devices are required for large amounts of data?
high-pass filtering
CT and MRI
CD or DVD
reduces
37. 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.
high-pass filtering
frequency
slow scanning
reduces
38. Computerized digital images are described in terms of what
bit
number of values displayed per image side
health level 7
ENIAC
39. What changes the pixel value by multiplication or division and controls image contrast?
bus
large amount
window width
software
40. What does DICOM stand for?
digital imaging and communication in medicine
little
voltage
inverse
41. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?
peripherals
bit
low-pass - band-pass - and high-pass
1940s
42. The ____ is the heart of the computer while the ___ is the vessels.
window width
little
CPU - Bus
RAM
43. What is critical to how fast the computer system can function?
peripherals
abacus
programs and data
bus speed
44. Modalities differ in bit depth that is available depending on the capabilities of what?
IR
magnetic tape
program
digital computers
45. Computer programs are called what?
software
array detection
read memory
pixel size
46. What is the 'heart' of every computer?
greater
edge enhancement filtering or sharpening
on
central processing unit
47. What is the mathematical algorithm used to create all medical images?
low-pass filter
2^x
window level
Fourier Transformation
48. What is the 'noisiest' component of a digital system?
expansion or compression
bus
array detection
TV camera
49. 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?
band-pass filtering
CT and MRI
edge enhancement filtering or sharpening
fine
50. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
ROM
low
10 megabyte
gray scale bit depth