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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. Computer memory is often rated in terms of total ____ memory.
high
frequency - contrast - and noise
ROM
byte
2. Changes in window width are sometimes called gray scale ____ or ____.
parallel - serial
transverse - sagittal - and coronal
software
expansion or compression
3. A __ _____ disk will store over 10000000 bytes of information.
software
data
10 megabyte
hardware
4. Window width and contrast have an ____ relationship.
frequency - contrast - and noise
computer - radiographer
CT and MRI
inverse
5. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
1945
smoothing
contrast
1-2 lp/mm
6. What type of scanning increases resolution slightly by scanning all 525 lines in order?
progressive scanning
detector
ROM
analog-to-digital converters
7. The quality of the data acquired from the IR is measured by what three data characteristics?
frequency - contrast - and noise
Input devices
hardware
progressive scanning
8. Which computers handle data composed of continuously varying electrical currents?
health level 7
expansion or compression
analog computers
Input devices
9. What input device do radiographers use on a normal basis?
Input devices
analog-to-digital converters
IRs
1970s-1990s
10. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
bus
Fourier Transformation
window level
1945
11. What is the information stored as magnetic variations referred to as?
peripherals
byte
memory
numerical value
12. What input device do radiographers use on a normal basis?
IRs
1000+
ROM
digital computers
13. What changes the pixel value by multiplication or division and controls image contrast?
binary machine
bus
window width
monitors and printers
14. What is an image that has been converted into numerical values for transmission or processing?
digital image
data
peripherals
computers
15. What is the mathematical algorithm used to create all medical images?
bus
Fourier Transformation
health level 7
reduces
16. What is the 'heart' of every computer?
ENIAC
software
array processors
central processing unit
17. Resolution is controlled by what?
matrix size
inversely
array detection
byte
18. What is the digital standard for imaging that is designed to ensure that all equipment fro all manufacturers who choose to adhere to the standard are speaking the same computer language?
voxel
0 - 1
slow scanning
DICOM standard
19. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
matrix size
contrast
200 - 500-1000
computer - radiographer
20. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
digital image
numerical values
inverse
1945
21. When was ENIAC invented?
byte
binary machine
1945
edge enhancement filtering or sharpening
22. If the window level increases - density will _____.
number of values displayed per image side
slow scanning
increase
software
23. If the window level increases - density will _____.
raster scan pattern
increase
on
direct
24. What is the name for a binary digit?
bit
voxel
computers
analog-to-digital converters
25. What does a 0 in binary code stand for?
off
progressive scanning
frequency
little
26. A low contrast image has a ___ frequency.
1940s
low
mathematical theory - solid-state electronics - and microchip technology
central processing unit
27. 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.
window
computer - radiographer
low-pass - band-pass - and high-pass
matrix size
28. Medical imaging is often achieved from information that has been processed by what?
high
binary machine
ENIAC
analog-to-digital converters
29. What changes the pixel value by multiplication or division and controls image contrast?
window width
gray scale bit depth
central processing unit
computers
30. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
RAM
voxel
little
DICOM standard
31. Noise is measured as what?
direct
low-pass filter
signal-to-noise ratio
Fourier Transformation
32. 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.
bus speed
program
high-pass filtering
DICOM standard
33. What is an individual matrix box or picture element?
bus
filtering
hardware
pixel
34. What is an image that has been converted into numerical values for transmission or processing?
abacus
off
digital image
2^x
35. What modalities are array processors useful for?
smoothing
CT and MRI
little
write memory
36. What 3 things were required prior to digital computer applications in medical imaging?
frequency - contrast - and noise
array processors
scanning or array detection
mathematical theory - solid-state electronics - and microchip technology
37. What are the two most common output devices?
matrix
electronic sources
high-pass filtering
monitors and printers
38. Modalities differ in bit depth that is available depending on the capabilities of what?
IR
band-pass filtering
noise
gray scale bit depth
39. What is the name of the 'modern electronic computer'?
number of values displayed per image side
matrix
ENIAC
Input devices
40. Increased noise = _____ image contrast.
decreased
peripherals
write memory
analog-to-digital converters
41. The ____ is the heart of the computer while the ___ is the vessels.
CPU - Bus
1-2 lp/mm
gray scale bit depth
increase
42. Each pixel is capable of representing a wide range of what?
shades of gray
digital computers
off
high
43. Fluoroscopic noise mostly comes from what?
write memory
32
smoothing
electronic sources
44. Each pixel is capable of representing a wide range of what?
write memory
bandwidth
accentuates or suppresses
shades of gray
45. Computerized digital images are described in terms of what
read memory
pixel
increase
number of values displayed per image side
46. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.
CT and MRI
low-pass filter
abacus
digital image
47. What is the name of the 'modern electronic computer'?
RAM
electronic sources
ENIAC
central processing unit
48. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
monitors and printers
smoothing
CT and MRI
magnetic tape
49. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
bus speed
ROM
byte
electronic sources
50. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
direct
RAM - ROM
magnetic tape
bandwidth