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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 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.
0 - 1
decrease
Fourier Transformation
two
2. Modalities differ in bit depth that is available depending on the capabilities of what?
analog-to-digital converters
window width
IR
1940s
3. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
bus
byte
noise
IRs
4. What is the random background information that does not contribute to the image quality?
low-pass filter
digital image
scanning
noise
5. What is required for collection of input information?
detector
noise
scanning
CPU - Bus
6. A __ _____ disk will store over 10000000 bytes of information.
filtering
reduces
CPU - Bus
10 megabyte
7. The computer either ____ or ____ selected frequencies during the filtering process.
accentuates or suppresses
large amount
detector
inverse
8. All medical imaging is achieved with which type of computers?
little
digital computers
peripherals
data
9. What is high-pass filtering also called?
edge enhancement filtering or sharpening
CD or DVD
contrast
peripherals
10. In what time period did mathematical theory and solid-state electronics come out?
array processors
transverse - sagittal - and coronal
on
1940s
11. What is the frequency response of the incoming signal called?
voxel
CT and MRI
bandwidth
gray scale bit depth
12. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.
IRs
1000+
numerical value
ROM
13. Who or What is responsible for density changes on a digital image? On a manual image
two
number of values displayed per image side
computer - radiographer
noise
14. Noise is measured as what?
signal-to-noise ratio
inverse
IRs
hardware
15. What is the raw data to which a Fourier Transformation is applied to create the digital image?
frequency
digital computers
central processing unit
parallel - serial
16. 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?
contrast
transverse - sagittal - and coronal
detector
magnetic tape
17. Each pixel is capable of representing a wide range of what?
high-pass filtering
computer - radiographer
decrease
shades of gray
18. What is the equation for determining gray scale bit depth?
2^x
IR
byte
detector
19. Which memory replaces new information with the old; can change?
progressive scanning
bit
write memory
analog computers
20. Computer memory is often rated in terms of total ____ memory.
read memory
0 - 1
byte
increase
21. 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?
bus
RAM - ROM
1960s
band-pass filtering
22. Medical imaging is often achieved from information that has been processed by what?
analog-to-digital converters
two
ROM
software
23. What are the two ways detectors acquire information?
scanning
signal-to-noise ratio
scanning or array detection
binary machine
24. What type of memory storage devices are required for large amounts of data?
detector
gray scale bit depth
digital computers
CD or DVD
25. When detectors acquire their information by ____ they are receiving info from a specific area.
digital image
frequency - contrast - and noise
scanning
digital computers
26. What is the primary limitation with the resolution on digital images?
reduces
direct
raster scan pattern
voltage
27. What is the name for an 8-bit word?
DICOM standard
large amount
32
byte
28. 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.
abacus
bus
window
frequency
29. What is the information stored as magnetic variations referred to as?
inversely
memory
byte
monitors and printers
30. What does a 0 in binary code stand for?
off
transverse - sagittal - and coronal
1000+
peripherals
31. 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
greater
bus
contrast
32. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
digital image
slow scanning
fine
10 megabyte
33. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?
filtering
slow scanning
0 - 1
high-pass filtering
34. What is the name for a binary digit?
CD or DVD
IR
greater
bit
35. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
Fourier Transformation
on
health level 7
200 - 500-1000
36. What is a specialized computer that functions as a peripheral and uses CPU memory to perform mathematical operations at extremely high speed?
ENIAC
smoothing
health level 7
array processors
37. Binary systems operate with a ___-symbol language.
two
scanning or array detection
smaller
inverse
38. Changes in window width are sometimes called gray scale ____ or ____.
expansion or compression
peripherals
bus speed
bus
39. What is the measure of the differences between the data values referred to as?
software
contrast
array processors
write memory
40. Digitalization of analog information (increases / reduces) the quality and quantity of information?
slow scanning
scanning or array detection
reduces
CPU - Bus
41. Which computers handle data composed of definite quantities of current?
memory
decrease
progressive scanning
digital computers
42. 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.
digital image
window
digital imaging and communication in medicine
bus
43. What are the two ways detectors acquire information?
digital image
scanning or array detection
shades of gray
reduces
44. When was ENIAC invented?
ENIAC
Input devices
decrease
1945
45. Computer equipment is called what?
hardware
increase
matrix
edge enhancement filtering or sharpening
46. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
on
smoothing
inversely
raster scan pattern
47. In what time period did mathematical theory and solid-state electronics come out?
direct
1940s
ENIAC
transverse - sagittal - and coronal
48. What are devices such as keyboard - touch screen monitors - and voice-activation that you put into or connect to a computer?
increase
slow scanning
Input devices
bus
49. What is the primary limitation with the resolution on digital images?
mathematical theory - solid-state electronics - and microchip technology
raster scan pattern
high-pass filtering
signal-to-noise ratio
50. What type of memory storage devices are required for large amounts of data?
1-2 lp/mm
CD or DVD
IRs
off