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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 does DICOM stand for?
two
low-pass - band-pass - and high-pass
digital imaging and communication in medicine
CPU - Bus
2. What is high-pass filtering also called?
number of values displayed per image side
bandwidth
analog-to-digital converters
edge enhancement filtering or sharpening
3. What input device do radiographers use on a normal basis?
IRs
matrix
software
reduces
4. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
health level 7
DICOM standard
accentuates or suppresses
1-2 lp/mm
5. A __ _____ disk will store over 10000000 bytes of information.
10 megabyte
inverse
1940s
smaller
6. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
fine
digital computers
progressive scanning
bus
7. Who or What is responsible for density changes on a digital image? On a manual image
CT and MRI
bit
computer - radiographer
array detection
8. Window width and contrast have an ____ relationship.
two
decrease
inverse
digital imaging and communication in medicine
9. A __ _____ disk will store over 10000000 bytes of information.
magnetic tape
10 megabyte
off
progressive scanning
10. What changes the pixel value by multiplication or division and controls image contrast?
1-2 lp/mm
band-pass filtering
central processing unit
window width
11. What are devices that process information?
0 - 1
computers
high-pass filtering
1-2 lp/mm
12. There is a ___ relationship between subject contrast and acquired data contrast.
high
1-2 lp/mm
array detection
direct
13. Modalities differ in bit depth that is available depending on the capabilities of what?
digital imaging and communication in medicine
IR
32
numerical values
14. Each pixel is capable of representing a wide range of what?
read memory
detector
shades of gray
write memory
15. Fluoroscopic noise mostly comes from what?
digital imaging and communication in medicine
1-2 lp/mm
electronic sources
bandwidth
16. What is the mathematical algorithm used to create all medical images?
numerical value
computers
Fourier Transformation
scanning or array detection
17. When was ENIAC invented?
1945
low-pass - band-pass - and high-pass
raster scan pattern
array detection
18. Around what time did digital computerization come out for CT and US?
numerical value
1970s-1990s
edge enhancement filtering or sharpening
RAM
19. What is the primary limitation with the resolution on digital images?
contrast
number of values displayed per image side
raster scan pattern
decrease
20. What is required for collection of input information?
computer - radiographer
data
edge enhancement filtering or sharpening
detector
21. Medical imaging is often achieved from information that has been processed by what?
inversely
Input devices
analog-to-digital converters
IR
22. What is a specialized computer that functions as a peripheral and uses CPU memory to perform mathematical operations at extremely high speed?
array processors
bit
band-pass filtering
contrast
23. Noise is measured as what?
RAM
1940s
on
signal-to-noise ratio
24. Each pixel is capable of representing a wide range of what?
band-pass filtering
voltage
shades of gray
hardware
25. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.
numerical value
decrease
0 - 1
IR
26. 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.
Input devices
1000+
0 - 1
bus
27. What does DICOM stand for?
1970s-1990s
digital imaging and communication in medicine
digital computers
digital computers
28. Increased noise = _____ image contrast.
program
decreased
central processing unit
32
29. Noise is ____ related to contrast.
window width
hardware
abacus
inversely
30. When was ENIAC invented?
Fourier Transformation
pixel
frequency - contrast - and noise
1945
31. When detectors acquire their information through ____ they are receiving all the info at once.
array detection
200 - 500-1000
filtering
large amount
32. Binary systems operate with a ___-symbol language.
RAM - ROM
band-pass filtering
digital computers
two
33. What are the 3 classifications of digitized image filters?
1940s
inverse
voltage
low-pass - band-pass - and high-pass
34. What changes the pixel value by addition or subtraction and controls image density?
smoothing
software
Fourier Transformation
window level
35. 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?
RAM
inversely
health level 7
off
36. Noise is ____ related to contrast.
programs and data
inversely
signal-to-noise ratio
RAM - ROM
37. What does a 0 in binary code stand for?
central processing unit
data
bus
off
38. What can memory be transferred as?
analog computers
voxel
voltage
10 megabyte
39. What changes the pixel value by addition or subtraction and controls image density?
bus
window level
digital computers
1000+
40. The quality of the data acquired from the IR is measured by what three data characteristics?
expansion or compression
IRs
high-pass filtering
frequency - contrast - and noise
41. Fluoroscopic noise mostly comes from what?
electronic sources
pixel size
array processors
1960s
42. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.
low-pass filter
1-2 lp/mm
expansion or compression
10 megabyte
43. The human visual range is ___ or fewer shades of gray.
slow scanning
band-pass filtering
32
CT and MRI
44. What type of scanning increases resolution but can't be used in real-time dynamic studies?
slow scanning
byte
array detection
1-2 lp/mm
45. Which memory can only be extracted without alteration; cannot change?
read memory
frequency
low-pass filter
Fourier Transformation
46. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
RAM
expansion or compression
software
1960s
47. A low contrast image has a ___ frequency.
binary machine
low
numerical value
expansion or compression
48. The computer either ____ or ____ selected frequencies during the filtering process.
high
smaller
accentuates or suppresses
CPU - Bus
49. 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?
DICOM standard
2^x
smaller
bus
50. Around what time did digital computerization come out for CT and US?
10 megabyte
1970s-1990s
decrease
electronic sources