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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. All medical imaging is achieved with which type of computers?
gray scale bit depth
digital computers
magnetic tape
ROM
2. What are the 3 classifications of digitized image filters?
low-pass - band-pass - and high-pass
low-pass filter
greater
high
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.
0 - 1
scanning
CD or DVD
low-pass filter
4. Which computers handle data composed of definite quantities of current?
abacus
digital computers
raster scan pattern
byte
5. If window width increases - image contrast will ____.
smaller
decrease
low-pass filter
little
6. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
voltage
digital image
smoothing
high
7. What 3 things were required prior to digital computer applications in medical imaging?
raster scan pattern
abacus
smaller
mathematical theory - solid-state electronics - and microchip technology
8. What are the 3 classifications of digitized image filters?
computers
mathematical theory - solid-state electronics - and microchip technology
low-pass - band-pass - and high-pass
abacus
9. What are the two ways detectors acquire information?
little
scanning or array detection
bus speed
hardware
10. 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.
health level 7
32
high-pass filtering
pixel size
11. What was the earliest computer device called?
abacus
high
32
large amount
12. What is the raw data to which a Fourier Transformation is applied to create the digital image?
frequency
off
large amount
inverse
13. Who or What is responsible for density changes on a digital image? On a manual image
CD or DVD
pixel
binary machine
computer - radiographer
14. Which type of information consists of operating instructions?
parallel - serial
analog computers
program
reduces
15. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.
accentuates or suppresses
1960s
IR
parallel - serial
16. Which memory can only be extracted without alteration; cannot change?
slow scanning
voxel
read memory
frequency
17. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
ROM
shades of gray
RAM - ROM
fine
18. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
byte
software
detector
200 - 500-1000
19. A low contrast image has a ___ frequency.
low
digital image
matrix
little
20. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
bandwidth
1-2 lp/mm
1-2 lp/mm
fine
21. The human visual range is ___ or fewer shades of gray.
progressive scanning
low-pass filter
byte
32
22. What is the measure of the differences between the data values referred to as?
monitors and printers
electronic sources
computer - radiographer
contrast
23. In what time period did mathematical theory and solid-state electronics come out?
bus
magnetic tape
1940s
Input devices
24. What modalities are array processors useful for?
CT and MRI
1940s
1960s
binary machine
25. When detectors acquire their information by ____ they are receiving info from a specific area.
scanning
scanning or array detection
CT and MRI
read memory
26. Which type of filter amplifies or deletes all but a selected range or band of frequencies and is useful in the elimination of characteristic emission peaks?
progressive scanning
CPU - Bus
band-pass filtering
bus
27. A __ _____ disk will store over 10000000 bytes of information.
noise
large amount
10 megabyte
greater
28. What is a specialized computer that functions as a peripheral and uses CPU memory to perform mathematical operations at extremely high speed?
data
array processors
peripherals
matrix size
29. 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
progressive scanning
little
1000+
30. Which memory can only be extracted without alteration; cannot change?
slow scanning
read memory
array processors
two
31. Medical imaging is often achieved from information that has been processed by what?
decrease
contrast
1945
analog-to-digital converters
32. Resolution is controlled by what?
matrix size
frequency
10 megabyte
decrease
33. Because electrical currents are understood as being either on or off - the binary system consists of information recorded as either a _ for off or a _ for on.
parallel - serial
IR
monitors and printers
0 - 1
34. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
digital image
frequency
numerical values
band-pass filtering
35. Noise is measured as what?
signal-to-noise ratio
greater
computer - radiographer
Fourier Transformation
36. What is an image that has been converted into numerical values for transmission or processing?
gray scale bit depth
little
digital image
raster scan pattern
37. In what time period did mathematical theory and solid-state electronics come out?
digital imaging and communication in medicine
1940s
high
central processing unit
38. What is high-pass filtering also called?
RAM
window width
edge enhancement filtering or sharpening
CPU - Bus
39. What are the two most common output devices?
direct
monitors and printers
ENIAC
off
40. When subject contrast is high - the acquired data contrast will be ____.
smoothing
32
high
IR
41. What is the name of the 'modern electronic computer'?
magnetic tape
window
central processing unit
ENIAC
42. What changes the pixel value by addition or subtraction and controls image density?
contrast
window level
inverse
expansion or compression
43. 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?
transverse - sagittal - and coronal
RAM
parallel - serial
peripherals
44. Computer equipment is called what?
hardware
inversely
detector
write memory
45. What type of scanning increases resolution slightly by scanning all 525 lines in order?
progressive scanning
IRs
large amount
read memory
46. What directs information to and from various parts of the computer?
central processing unit
high
RAM - ROM
matrix
47. What does DICOM stand for?
digital imaging and communication in medicine
pixel
200 - 500-1000
monitors and printers
48. There is a ___ relationship between subject contrast and acquired data contrast.
direct
scanning
analog-to-digital converters
raster scan pattern
49. 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.
peripherals
slow scanning
window
data
50. What is an individual matrix box or picture element?
bus
computers
pixel
IR