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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. What are devices that process information?
computers
ROM
smaller
bit
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?
bus
scanning or array detection
decrease
10 megabyte
3. What is the random background information that does not contribute to the image quality?
binary machine
noise
abacus
window width
4. What is the frequency response of the incoming signal called?
bandwidth
greater
ROM
high-pass filtering
5. What type of scanning increases resolution slightly by scanning all 525 lines in order?
numerical values
TV camera
accentuates or suppresses
progressive scanning
6. 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.
array detection
large amount
high-pass filtering
1-2 lp/mm
7. The quality of the data acquired from the IR is measured by what three data characteristics?
slow scanning
decrease
ENIAC
frequency - contrast - and noise
8. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
large amount
analog computers
central processing unit
frequency
9. What does a 0 in binary code stand for?
array processors
off
window
inverse
10. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
bandwidth
RAM
abacus
ROM
11. Which computers handle data composed of definite quantities of current?
digital computers
RAM
hardware
computer - radiographer
12. What are the 3 classifications of digitized image filters?
high
low-pass - band-pass - and high-pass
1960s
1-2 lp/mm
13. What can memory be transferred as?
scanning or array detection
voltage
software
fine
14. Around what time did digital computerization come out for CT and US?
1970s-1990s
accentuates or suppresses
1-2 lp/mm
health level 7
15. If the window level increases - density will _____.
increase
central processing unit
IR
window width
16. 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
digital image
analog-to-digital converters
10 megabyte
17. What is the 'noisiest' component of a digital system?
binary machine
10 megabyte
TV camera
array detection
18. What changes the pixel value by multiplication or division and controls image contrast?
hardware
numerical value
window width
bus
19. DICOM imaging now includes compatibility via a database system that includes linage of the patient images with the patient's EMR. This database system is called what?
health level 7
programs and data
binary machine
transverse - sagittal - and coronal
20. A __ _____ disk will store over 10000000 bytes of information.
RAM - ROM
window width
10 megabyte
binary machine
21. What is the raw data to which a Fourier Transformation is applied to create the digital image?
abacus
pixel size
frequency
matrix size
22. What is an image that has been converted into numerical values for transmission or processing?
reduces
digital image
magnetic tape
high
23. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
CPU - Bus
voxel
high
digital computers
24. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
1-2 lp/mm
greater
IRs
inversely
25. What is critical to how fast the computer system can function?
1-2 lp/mm
bus
magnetic tape
bus speed
26. What changes the pixel value by addition or subtraction and controls image density?
0 - 1
window level
digital computers
inversely
27. What is the name of the 'modern electronic computer'?
ENIAC
raster scan pattern
1970s-1990s
signal-to-noise ratio
28. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?
matrix size
mathematical theory - solid-state electronics - and microchip technology
peripherals
1960s
29. What are the 3 classifications of digitized image filters?
low
32
1960s
low-pass - band-pass - and high-pass
30. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.
little
computer - radiographer
low-pass filter
bus
31. What 3 things were required prior to digital computer applications in medical imaging?
mathematical theory - solid-state electronics - and microchip technology
gray scale bit depth
analog-to-digital converters
contrast
32. What type of memory storage devices are required for large amounts of data?
200 - 500-1000
inversely
2^x
CD or DVD
33. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?
ENIAC
Fourier Transformation
filtering
array processors
34. When was ENIAC invented?
1945
DICOM standard
parallel - serial
decreased
35. What changes the pixel value by multiplication or division and controls image contrast?
analog-to-digital converters
2^x
window width
analog-to-digital converters
36. Each pixel is capable of representing a wide range of what?
DICOM standard
little
data
shades of gray
37. When detectors acquire their information by ____ they are receiving info from a specific area.
fine
scanning
parallel - serial
fine
38. The computer either ____ or ____ selected frequencies during the filtering process.
direct
numerical value
digital computers
accentuates or suppresses
39. What are devices such as keyboard - touch screen monitors - and voice-activation that you put into or connect to a computer?
data
Input devices
array detection
abacus
40. Noise is ____ related to contrast.
inversely
increase
smaller
noise
41. What can memory be transferred as?
shades of gray
write memory
voltage
direct
42. Which memory replaces new information with the old; can change?
analog-to-digital converters
voltage
write memory
0 - 1
43. Changes in window width are sometimes called gray scale ____ or ____.
CPU - Bus
array processors
monitors and printers
expansion or compression
44. All medical imaging is achieved with which type of computers?
read memory
32
digital computers
Input devices
45. 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
high
low
transverse - sagittal - and coronal
46. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
write memory
CPU - Bus
digital image
1-2 lp/mm
47. Noise is measured as what?
signal-to-noise ratio
voxel
increase
bus speed
48. Which type of information consists of operating instructions?
DICOM standard
software
program
low-pass filter
49. Noise is ____ related to contrast.
matrix size
inversely
bus
monitors and printers
50. What input device do radiographers use on a normal basis?
voxel
CD or DVD
IRs
low