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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. Resolution is controlled by what?
frequency
band-pass filtering
1960s
matrix size
2. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
RAM - ROM
binary machine
1945
binary machine
3. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
monitors and printers
write memory
ROM
on
4. If window width increases - image contrast will ____.
accentuates or suppresses
1970s-1990s
pixel size
decrease
5. Noise is measured as what?
data
signal-to-noise ratio
bus
program
6. What is critical to how fast the computer system can function?
little
bus speed
0 - 1
ENIAC
7. What is the random background information that does not contribute to the image quality?
array detection
noise
scanning
low
8. Computer programs are called what?
software
magnetic tape
frequency - contrast - and noise
mathematical theory - solid-state electronics - and microchip technology
9. 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
pixel
digital computers
band-pass filtering
10. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.
parallel - serial
electronic sources
ROM
digital computers
11. A high S/N indicates ___ noise in the image.
little
low-pass filter
health level 7
software
12. The number of shades of gray is determined by what?
gray scale bit depth
mathematical theory - solid-state electronics - and microchip technology
window
array detection
13. Noise is measured as what?
signal-to-noise ratio
bus
0 - 1
digital computers
14. 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?
array detection
health level 7
write memory
monitors and printers
15. When detectors acquire their information through ____ they are receiving all the info at once.
matrix size
bit
CD or DVD
array detection
16. All medical imaging is achieved with which type of computers?
digital computers
read memory
band-pass filtering
CD or DVD
17. In what time period did mathematical theory and solid-state electronics come out?
1940s
computer - radiographer
CPU - Bus
32
18. Which memory can only be extracted without alteration; cannot change?
low
progressive scanning
read memory
gray scale bit depth
19. 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.
32
voxel
0 - 1
numerical value
20. What is high-pass filtering also called?
decreased
low
edge enhancement filtering or sharpening
1960s
21. Binary systems operate with a ___-symbol language.
inverse
two
write memory
magnetic tape
22. 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
Fourier Transformation
IRs
low-pass filter
23. Each pixel is capable of representing a wide range of what?
matrix size
low-pass filter
shades of gray
health level 7
24. Which type of information consists of collected facts?
frequency - contrast - and noise
decrease
detector
data
25. What changes the pixel value by addition or subtraction and controls image density?
voxel
window level
transverse - sagittal - and coronal
program
26. What is a specialized computer that functions as a peripheral and uses CPU memory to perform mathematical operations at extremely high speed?
smoothing
bandwidth
array processors
high
27. What is the equation for determining gray scale bit depth?
window
bandwidth
IR
2^x
28. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
magnetic tape
little
window
numerical values
29. Computer memory is often rated in terms of total ____ memory.
byte
RAM
frequency
digital computers
30. What is a square series of boxes that gives form to the image?
TV camera
byte
reduces
matrix
31. What does a 0 in binary code stand for?
0 - 1
off
number of values displayed per image side
Fourier Transformation
32. A __ _____ disk will store over 10000000 bytes of information.
window width
two
10 megabyte
abacus
33. Which type of information consists of operating instructions?
1000+
ENIAC
ENIAC
program
34. What changes the pixel value by multiplication or division and controls image contrast?
Fourier Transformation
1000+
IRs
window width
35. What are devices that process information?
computers
read memory
digital imaging and communication in medicine
software
36. The _____ the matrix size - the better the resolution.
fine
greater
32
analog-to-digital converters
37. What does DICOM stand for?
digital imaging and communication in medicine
magnetic tape
detector
byte
38. Binary systems operate with a ___-symbol language.
two
computer - radiographer
shades of gray
32
39. Window width and contrast have an ____ relationship.
inverse
2^x
two
0 - 1
40. What can memory be transferred as?
expansion or compression
numerical value
voltage
ROM
41. If the window level increases - density will _____.
smaller
digital imaging and communication in medicine
increase
inversely
42. If the window level increases - density will _____.
1-2 lp/mm
increase
IR
noise
43. In what time period did mathematical theory and solid-state electronics come out?
program
32
1940s
smaller
44. A larger matrix provides ____ pixels.
smaller
RAM
smoothing
low
45. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
magnetic tape
voxel
digital computers
array processors
46. Changes in window width are sometimes called gray scale ____ or ____.
scanning
window level
programs and data
expansion or compression
47. What are the two types of information computers use?
scanning or array detection
programs and data
TV camera
high
48. What are devices such as keyboard - touch screen monitors - and voice-activation that you put into or connect to a computer?
noise
Input devices
digital image
byte
49. Noise is ____ related to contrast.
software
inversely
expansion or compression
high-pass filtering
50. Fluoroscopic noise mostly comes from what?
progressive scanning
bandwidth
electronic sources
accentuates or suppresses