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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. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
bus
window level
computer - radiographer
peripherals
2. Computerized digital images are described in terms of what
number of values displayed per image side
read memory
Input devices
peripherals
3. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.
low-pass filter
digital imaging and communication in medicine
read memory
detector
4. What is the primary limitation with the resolution on digital images?
raster scan pattern
bit
bus speed
array detection
5. Noise is measured as what?
electronic sources
smoothing
smaller
signal-to-noise ratio
6. A high S/N indicates ___ noise in the image.
Fourier Transformation
software
computer - radiographer
little
7. Noise is ____ related to contrast.
TV camera
inversely
low-pass - band-pass - and high-pass
increase
8. What type of scanning increases resolution slightly by scanning all 525 lines in order?
1940s
CT and MRI
IRs
progressive scanning
9. 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?
on
DICOM standard
Fourier Transformation
little
10. Which memory replaces new information with the old; can change?
write memory
numerical values
high
RAM
11. What can memory be transferred as?
voltage
central processing unit
array detection
TV camera
12. A high contrast image has a ___ frequency.
decrease
high
1-2 lp/mm
parallel - serial
13. What changes the pixel value by addition or subtraction and controls image density?
1000+
frequency - contrast - and noise
window level
analog computers
14. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?
write memory
scanning
Input devices
peripherals
15. Modalities differ in bit depth that is available depending on the capabilities of what?
IR
frequency
read memory
high
16. Fluoroscopic noise mostly comes from what?
CPU - Bus
1960s
array processors
electronic sources
17. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
DICOM standard
high-pass filtering
RAM
decrease
18. What is the measure of the differences between the data values referred to as?
contrast
number of values displayed per image side
digital image
program
19. Medical imaging is often achieved from information that has been processed by what?
analog-to-digital converters
central processing unit
progressive scanning
bus
20. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
voxel
CD or DVD
ENIAC
byte
21. Digital detectors are capable of producing ______ shades of gray.
1000+
central processing unit
numerical value
shades of gray
22. Computers operate from ____ ____ language.
parallel - serial
high-pass filtering
CT and MRI
binary machine
23. When detectors acquire their information through ____ they are receiving all the info at once.
health level 7
1940s
array detection
decreased
24. Binary systems operate with a ___-symbol language.
scanning or array detection
detector
high
two
25. What does a 0 in binary code stand for?
abacus
1970s-1990s
bus
off
26. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
array detection
IR
RAM
IRs
27. What is the name for an 8-bit word?
byte
magnetic tape
0 - 1
progressive scanning
28. The number of shades of gray is determined by what?
number of values displayed per image side
byte
gray scale bit depth
smoothing
29. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
fine
progressive scanning
ROM
greater
30. What is the name for an 8-bit word?
window
smaller
number of values displayed per image side
byte
31. What is the 'heart' of every computer?
digital computers
parallel - serial
central processing unit
off
32. If the window level increases - density will _____.
parallel - serial
high
increase
contrast
33. If window width increases - image contrast will ____.
mathematical theory - solid-state electronics - and microchip technology
voxel
smoothing
decrease
34. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?
peripherals
low-pass - band-pass - and high-pass
IR
shades of gray
35. What does DICOM stand for?
digital imaging and communication in medicine
peripherals
computers
Fourier Transformation
36. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
little
1-2 lp/mm
2^x
voxel
37. The _____ the matrix size - the better the resolution.
direct
matrix
window
greater
38. What permit input/output of information to or from the CPU?
decrease
peripherals
1940s
analog computers
39. What is the mathematical algorithm used to create all medical images?
Fourier Transformation
bus
fine
frequency - contrast - and noise
40. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.
computers
numerical value
ROM
software
41. What determines resolution?
peripherals
pixel size
IR
increase
42. What changes the pixel value by multiplication or division and controls image contrast?
ROM
RAM
1-2 lp/mm
window width
43. There is a ___ relationship between subject contrast and acquired data contrast.
little
pixel size
direct
shades of gray
44. Noise is measured as what?
edge enhancement filtering or sharpening
signal-to-noise ratio
digital computers
analog-to-digital converters
45. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
detector
bit
transverse - sagittal - and coronal
large amount
46. Window width and contrast have an ____ relationship.
greater
shades of gray
analog computers
inverse
47. Computer memory is often rated in terms of total ____ memory.
window width
bus
filtering
byte
48. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
fine
pixel
software
array detection
49. When subject contrast is high - the acquired data contrast will be ____.
edge enhancement filtering or sharpening
inverse
voltage
high
50. What is an image that has been converted into numerical values for transmission or processing?
digital image
pixel
window level
1000+