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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. 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.
slow scanning
window
32
inverse
2. 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?
shades of gray
1960s
bus
200 - 500-1000
3. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?
inversely
software
peripherals
bandwidth
4. What type of memory storage devices are required for large amounts of data?
IR
digital image
window width
CD or DVD
5. 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?
bus speed
transverse - sagittal - and coronal
filtering
software
6. What does a 1 in binary code stand for?
write memory
bus speed
on
smaller
7. In what time period did mathematical theory and solid-state electronics come out?
analog computers
0 - 1
on
1940s
8. What is the random background information that does not contribute to the image quality?
window
analog-to-digital converters
noise
digital image
9. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
fine
bus
200 - 500-1000
decrease
10. 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?
transverse - sagittal - and coronal
DICOM standard
1970s-1990s
read memory
11. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
memory
bandwidth
numerical value
smoothing
12. Modalities differ in bit depth that is available depending on the capabilities of what?
IR
CD or DVD
gray scale bit depth
array processors
13. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
numerical values
digital image
high
progressive scanning
14. Noise is ____ related to contrast.
detector
inversely
two
1000+
15. What modalities are array processors useful for?
RAM
decrease
ROM
CT and MRI
16. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
programs and data
matrix size
scanning
RAM - ROM
17. Resolution is controlled by what?
program
signal-to-noise ratio
bus speed
matrix size
18. What is required for collection of input information?
edge enhancement filtering or sharpening
matrix size
Fourier Transformation
detector
19. What is the primary limitation with the resolution on digital images?
digital computers
electronic sources
data
raster scan pattern
20. Which memory replaces new information with the old; can change?
read memory
write memory
hardware
low
21. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
RAM - ROM
bus
matrix size
window level
22. The human visual range is ___ or fewer shades of gray.
scanning
bus
32
central processing unit
23. Which computers handle data composed of continuously varying electrical currents?
analog computers
200 - 500-1000
contrast
high-pass filtering
24. What was the earliest computer device called?
abacus
1000+
RAM - ROM
slow scanning
25. Which type of information consists of collected facts?
data
scanning or array detection
read memory
inversely
26. What are devices that process information?
computers
transverse - sagittal - and coronal
decrease
Input devices
27. What 3 things were required prior to digital computer applications in medical imaging?
mathematical theory - solid-state electronics - and microchip technology
programs and data
binary machine
byte
28. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?
signal-to-noise ratio
gray scale bit depth
TV camera
magnetic tape
29. What are the 3 classifications of digitized image filters?
low-pass - band-pass - and high-pass
1-2 lp/mm
abacus
RAM
30. What input device do radiographers use on a normal basis?
smaller
central processing unit
IRs
low-pass filter
31. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
byte
large amount
digital computers
IRs
32. What type of scanning increases resolution but can't be used in real-time dynamic studies?
slow scanning
band-pass filtering
IRs
read memory
33. Digitalization of analog information (increases / reduces) the quality and quantity of information?
data
ENIAC
reduces
frequency
34. Changes in window width are sometimes called gray scale ____ or ____.
0 - 1
expansion or compression
voxel
increase
35. What is the information stored as magnetic variations referred to as?
central processing unit
detector
memory
voxel
36. What changes the pixel value by addition or subtraction and controls image density?
pixel
pixel size
window level
program
37. What is the name of the 'modern electronic computer'?
bit
ENIAC
bandwidth
write memory
38. What 3 things were required prior to digital computer applications in medical imaging?
low-pass filter
computer - radiographer
mathematical theory - solid-state electronics - and microchip technology
1960s
39. When was ENIAC invented?
CT and MRI
binary machine
1945
parallel - serial
40. What permit input/output of information to or from the CPU?
bus
1-2 lp/mm
bus speed
peripherals
41. What is a square series of boxes that gives form to the image?
bandwidth
TV camera
write memory
matrix
42. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
increase
digital imaging and communication in medicine
RAM
1-2 lp/mm
43. What changes the pixel value by addition or subtraction and controls image density?
frequency
window level
digital imaging and communication in medicine
central processing unit
44. What is the 'noisiest' component of a digital system?
CT and MRI
TV camera
bus
shades of gray
45. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?
1000+
progressive scanning
data
magnetic tape
46. Noise is measured as what?
analog-to-digital converters
parallel - serial
signal-to-noise ratio
mathematical theory - solid-state electronics - and microchip technology
47. Digitalization of analog information (increases / reduces) the quality and quantity of information?
window
reduces
computers
little
48. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
parallel - serial
1-2 lp/mm
fine
32
49. What is the measure of the differences between the data values referred to as?
low-pass filter
low-pass - band-pass - and high-pass
contrast
slow scanning
50. What provides specific instructions for calculations and sequential steps to be followed?
software
low
200 - 500-1000
band-pass filtering