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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. Changes in window width are sometimes called gray scale ____ or ____.
digital computers
CT and MRI
expansion or compression
1000+
2. What is an individual matrix box or picture element?
1960s
voxel
1945
pixel
3. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
10 megabyte
write memory
transverse - sagittal - and coronal
numerical values
4. What is the 'noisiest' component of a digital system?
data
numerical values
TV camera
RAM
5. What is the frequency response of the incoming signal called?
bandwidth
1945
electronic sources
32
6. What changes the pixel value by multiplication or division and controls image contrast?
shades of gray
200 - 500-1000
window width
200 - 500-1000
7. What modalities are array processors useful for?
matrix
increase
CT and MRI
1960s
8. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?
hardware
analog computers
magnetic tape
analog-to-digital converters
9. Which type of information consists of operating instructions?
digital computers
bandwidth
program
200 - 500-1000
10. What does DICOM stand for?
digital imaging and communication in medicine
matrix
matrix
frequency
11. Computer equipment is called what?
memory
hardware
large amount
little
12. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
smoothing
programs and data
2^x
computer - radiographer
13. What are the two ways detectors acquire information?
filtering
analog-to-digital converters
scanning or array detection
1970s-1990s
14. Digital detectors are capable of producing ______ shades of gray.
window
data
1000+
voxel
15. Computer programs are called what?
bus speed
software
mathematical theory - solid-state electronics - and microchip technology
detector
16. When was ENIAC invented?
1945
analog-to-digital converters
200 - 500-1000
shades of gray
17. What is the primary limitation with the resolution on digital images?
numerical value
raster scan pattern
scanning
1940s
18. What determines resolution?
health level 7
noise
pixel size
low-pass filter
19. In what time period did microchip technology come out?
large amount
software
1960s
2^x
20. When detectors acquire their information by ____ they are receiving info from a specific area.
numerical values
1970s-1990s
scanning
hardware
21. A larger matrix provides ____ pixels.
low
smaller
low-pass filter
edge enhancement filtering or sharpening
22. In what time period did mathematical theory and solid-state electronics come out?
CD or DVD
high-pass filtering
scanning
1940s
23. What changes the pixel value by multiplication or division and controls image contrast?
peripherals
window width
central processing unit
digital computers
24. What is the name for an 8-bit word?
write memory
scanning or array detection
detector
byte
25. What is high-pass filtering also called?
edge enhancement filtering or sharpening
IR
voxel
pixel
26. The number of shades of gray is determined by what?
numerical value
programs and data
2^x
gray scale bit depth
27. When detectors acquire their information through ____ they are receiving all the info at once.
electronic sources
array detection
decrease
parallel - serial
28. A high S/N indicates ___ noise in the image.
software
low
little
digital computers
29. Which memory can only be extracted without alteration; cannot change?
binary machine
IR
digital computers
read memory
30. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.
parallel - serial
low
contrast
CPU - Bus
31. What directs information to and from various parts of the computer?
central processing unit
2^x
voltage
matrix size
32. The computer either ____ or ____ selected frequencies during the filtering process.
accentuates or suppresses
bandwidth
increase
memory
33. Which type of information consists of operating instructions?
TV camera
gray scale bit depth
decreased
program
34. What are the two ways detectors acquire information?
scanning or array detection
TV camera
computer - radiographer
ROM
35. Which memory replaces new information with the old; can change?
numerical value
RAM
write memory
RAM - ROM
36. Which computers handle data composed of continuously varying electrical currents?
analog computers
CD or DVD
abacus
bandwidth
37. A low contrast image has a ___ frequency.
central processing unit
low
signal-to-noise ratio
1970s-1990s
38. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
RAM
program
electronic sources
high
39. Fluoroscopic noise mostly comes from what?
1000+
array detection
electronic sources
bus
40. What are devices that process information?
computers
binary machine
computer - radiographer
digital computers
41. What is a specialized computer that functions as a peripheral and uses CPU memory to perform mathematical operations at extremely high speed?
array processors
transverse - sagittal - and coronal
200 - 500-1000
band-pass filtering
42. Increased noise = _____ image contrast.
expansion or compression
decreased
decrease
2^x
43. 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
IR
2^x
1970s-1990s
44. What changes the pixel value by addition or subtraction and controls image density?
window level
frequency
DICOM standard
1940s
45. What are devices that process information?
computers
electronic sources
scanning or array detection
shades of gray
46. Which computers handle data composed of definite quantities of current?
digital computers
Fourier Transformation
numerical values
2^x
47. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
software
bit
abacus
bus
48. What is the name for an 8-bit word?
byte
memory
smaller
computers
49. What is required for collection of input information?
numerical values
binary machine
bus
detector
50. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?
gray scale bit depth
little
peripherals
central processing unit