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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. The ____ is the heart of the computer while the ___ is the vessels.
greater
CPU - Bus
write memory
reduces
2. Who or What is responsible for density changes on a digital image? On a manual image
accentuates or suppresses
decreased
computer - radiographer
frequency
3. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
computers
fine
high
abacus
4. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
analog-to-digital converters
filtering
array detection
200 - 500-1000
5. What 3 things were required prior to digital computer applications in medical imaging?
IRs
computers
mathematical theory - solid-state electronics - and microchip technology
smaller
6. What is the mathematical algorithm used to create all medical images?
Fourier Transformation
fine
decreased
2^x
7. There is a ___ relationship between subject contrast and acquired data contrast.
decreased
direct
1940s
abacus
8. What type of scanning increases resolution but can't be used in real-time dynamic studies?
byte
high-pass filtering
array detection
slow scanning
9. What is the name for a binary digit?
electronic sources
low-pass - band-pass - and high-pass
off
bit
10. Fluoroscopic noise mostly comes from what?
pixel size
electronic sources
peripherals
byte
11. Noise is ____ related to contrast.
numerical values
decreased
inversely
scanning
12. Digitalization of analog information (increases / reduces) the quality and quantity of information?
inverse
mathematical theory - solid-state electronics - and microchip technology
reduces
byte
13. What is the system of conductors that connects the various components of a computer system and permits the CPU to accept inputs from any point along the conductor?
low
hardware
bus
electronic sources
14. What changes the pixel value by multiplication or division and controls image contrast?
window width
shades of gray
band-pass filtering
IRs
15. Digital detectors are capable of producing ______ shades of gray.
CD or DVD
1000+
gray scale bit depth
low-pass filter
16. What are the two most common output devices?
monitors and printers
scanning or array detection
DICOM standard
voxel
17. Noise is measured as what?
matrix
0 - 1
signal-to-noise ratio
200 - 500-1000
18. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
array detection
10 megabyte
central processing unit
voxel
19. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.
progressive scanning
software
bus
parallel - serial
20. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
fine
2^x
mathematical theory - solid-state electronics - and microchip technology
number of values displayed per image side
21. A __ _____ disk will store over 10000000 bytes of information.
voxel
mathematical theory - solid-state electronics - and microchip technology
10 megabyte
number of values displayed per image side
22. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
voxel
scanning
1960s
byte
23. Each pixel is capable of representing a wide range of what?
scanning or array detection
byte
data
shades of gray
24. 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.
high
digital image
0 - 1
1940s
25. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
progressive scanning
digital imaging and communication in medicine
smoothing
mathematical theory - solid-state electronics - and microchip technology
26. What is the system of conductors that connects the various components of a computer system and permits the CPU to accept inputs from any point along the conductor?
inverse
two
bus
CT and MRI
27. What is an individual matrix box or picture element?
pixel
Input devices
inverse
mathematical theory - solid-state electronics - and microchip technology
28. Which type of information consists of operating instructions?
program
health level 7
contrast
1000+
29. What changes the pixel value by multiplication or division and controls image contrast?
numerical values
window width
slow scanning
1940s
30. What input device do radiographers use on a normal basis?
1960s
numerical values
decreased
IRs
31. Digitalization of analog information (increases / reduces) the quality and quantity of information?
fine
low
reduces
matrix size
32. 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?
frequency - contrast - and noise
slow scanning
greater
band-pass filtering
33. What is the frequency response of the incoming signal called?
off
band-pass filtering
bandwidth
1970s-1990s
34. A high contrast image has a ___ frequency.
32
high
frequency
bit
35. Fluoroscopic noise mostly comes from what?
CT and MRI
32
electronic sources
DICOM standard
36. What is a square series of boxes that gives form to the image?
slow scanning
progressive scanning
matrix
CT and MRI
37. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
read memory
computer - radiographer
bandwidth
RAM
38. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.
high-pass filtering
digital computers
magnetic tape
parallel - serial
39. What changes the pixel value by addition or subtraction and controls image density?
raster scan pattern
edge enhancement filtering or sharpening
window level
1960s
40. What are the two ways detectors acquire information?
200 - 500-1000
filtering
scanning or array detection
magnetic tape
41. What is high-pass filtering also called?
IRs
edge enhancement filtering or sharpening
matrix size
scanning or array detection
42. What is required for collection of input information?
Fourier Transformation
0 - 1
gray scale bit depth
detector
43. When subject contrast is high - the acquired data contrast will be ____.
RAM
high
RAM - ROM
CPU - Bus
44. A high contrast image has a ___ frequency.
high
transverse - sagittal - and coronal
large amount
frequency
45. When detectors acquire their information by ____ they are receiving info from a specific area.
analog computers
scanning
programs and data
CT and MRI
46. What is the primary limitation with the resolution on digital images?
mathematical theory - solid-state electronics - and microchip technology
raster scan pattern
off
1970s-1990s
47. Modalities differ in bit depth that is available depending on the capabilities of what?
magnetic tape
TV camera
IR
high
48. What is the name for an 8-bit word?
peripherals
slow scanning
byte
low-pass - band-pass - and high-pass
49. Noise is measured as what?
signal-to-noise ratio
digital computers
software
peripherals
50. What changes the pixel value by addition or subtraction and controls image density?
window level
inversely
number of values displayed per image side
electronic sources