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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. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
direct
voxel
memory
scanning
2. Each pixel is capable of representing a wide range of what?
1940s
shades of gray
little
high-pass filtering
3. What input device do radiographers use on a normal basis?
digital image
electronic sources
IRs
noise
4. What is required for collection of input information?
software
detector
decreased
Fourier Transformation
5. What is an individual matrix box or picture element?
pixel
binary machine
read memory
RAM
6. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
expansion or compression
bit
1-2 lp/mm
0 - 1
7. What are devices that process information?
matrix
window width
detector
computers
8. What is a specialized computer that functions as a peripheral and uses CPU memory to perform mathematical operations at extremely high speed?
array processors
analog-to-digital converters
frequency - contrast - and noise
contrast
9. Who or What is responsible for density changes on a digital image? On a manual image
analog computers
computer - radiographer
window
shades of gray
10. The ____ is the heart of the computer while the ___ is the vessels.
200 - 500-1000
CPU - Bus
write memory
pixel
11. Fluoroscopic noise mostly comes from what?
peripherals
electronic sources
pixel
high
12. What is the information stored as magnetic variations referred to as?
program
memory
programs and data
read memory
13. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
fine
large amount
low
RAM - ROM
14. Which type of information consists of operating instructions?
program
voltage
direct
pixel size
15. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
numerical value
bandwidth
10 megabyte
numerical values
16. Around what time did digital computerization come out for CT and US?
progressive scanning
1970s-1990s
digital imaging and communication in medicine
window level
17. The human visual range is ___ or fewer shades of gray.
32
little
noise
central processing unit
18. What is the equation for determining gray scale bit depth?
digital imaging and communication in medicine
high
hardware
2^x
19. When detectors acquire their information through ____ they are receiving all the info at once.
byte
array detection
off
increase
20. Which computers handle data composed of definite quantities of current?
10 megabyte
digital computers
1-2 lp/mm
parallel - serial
21. Computer programs are called what?
IRs
number of values displayed per image side
window level
software
22. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
analog-to-digital converters
smoothing
digital computers
peripherals
23. What are the two ways detectors acquire information?
Fourier Transformation
scanning or array detection
transverse - sagittal - and coronal
pixel size
24. What provides specific instructions for calculations and sequential steps to be followed?
progressive scanning
write memory
software
digital computers
25. Who or What is responsible for density changes on a digital image? On a manual image
progressive scanning
edge enhancement filtering or sharpening
computer - radiographer
edge enhancement filtering or sharpening
26. In what time period did microchip technology come out?
binary machine
electronic sources
1960s
computer - radiographer
27. Each pixel is capable of representing a wide range of what?
shades of gray
contrast
inversely
window level
28. If the window level increases - density will _____.
little
bit
increase
matrix
29. Digital detectors are capable of producing ______ shades of gray.
1960s
hardware
smoothing
1000+
30. There is a ___ relationship between subject contrast and acquired data contrast.
10 megabyte
DICOM standard
direct
bit
31. Around what time did digital computerization come out for CT and US?
1970s-1990s
window
digital imaging and communication in medicine
1000+
32. 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?
mathematical theory - solid-state electronics - and microchip technology
1970s-1990s
binary machine
DICOM standard
33. What 3 things were required prior to digital computer applications in medical imaging?
32
1940s
data
mathematical theory - solid-state electronics - and microchip technology
34. What are devices that process information?
computers
bit
array processors
off
35. Changes in window width are sometimes called gray scale ____ or ____.
expansion or compression
bandwidth
slow scanning
greater
36. What does DICOM stand for?
off
digital imaging and communication in medicine
low-pass filter
central processing unit
37. What is the 'noisiest' component of a digital system?
1-2 lp/mm
TV camera
smoothing
window width
38. Computer programs are called what?
contrast
gray scale bit depth
1940s
software
39. What is the name of the 'modern electronic computer'?
two
pixel size
ENIAC
digital imaging and communication in medicine
40. Binary systems operate with a ___-symbol language.
decrease
numerical values
read memory
two
41. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
off
noise
bus
IRs
42. What are the two ways detectors acquire information?
hardware
programs and data
1945
scanning or array detection
43. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
DICOM standard
monitors and printers
contrast
RAM - ROM
44. A __ _____ disk will store over 10000000 bytes of information.
high
TV camera
low-pass - band-pass - and high-pass
10 megabyte
45. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
RAM
32
large amount
peripherals
46. If window width increases - image contrast will ____.
decrease
increase
expansion or compression
window
47. What 3 things were required prior to digital computer applications in medical imaging?
TV camera
expansion or compression
frequency
mathematical theory - solid-state electronics - and microchip technology
48. What does a 0 in binary code stand for?
gray scale bit depth
bit
off
read memory
49. When was ENIAC invented?
1945
monitors and printers
low-pass filter
analog-to-digital converters
50. Computer equipment is called what?
on
voxel
hardware
health level 7