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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 is the frequency response of the incoming signal called?
200 - 500-1000
bit
parallel - serial
bandwidth
2. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
inversely
low-pass - band-pass - and high-pass
programs and data
200 - 500-1000
3. The computer either ____ or ____ selected frequencies during the filtering process.
programs and data
little
accentuates or suppresses
filtering
4. What determines resolution?
mathematical theory - solid-state electronics - and microchip technology
scanning
pixel size
window width
5. What is the name of the 'modern electronic computer'?
frequency
scanning
ENIAC
hardware
6. Each pixel is capable of representing a wide range of what?
window
direct
RAM
shades of gray
7. Window width and contrast have an ____ relationship.
contrast
digital computers
IR
inverse
8. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
digital imaging and communication in medicine
filtering
200 - 500-1000
numerical values
9. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
write memory
CT and MRI
bus
array detection
10. Digitalization of analog information (increases / reduces) the quality and quantity of information?
reduces
smaller
program
inverse
11. What is an image that has been converted into numerical values for transmission or processing?
window level
digital image
numerical value
CPU - Bus
12. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
peripherals
byte
direct
smoothing
13. Which computers handle data composed of continuously varying electrical currents?
direct
RAM
analog computers
progressive scanning
14. Which memory can only be extracted without alteration; cannot change?
32
numerical value
read memory
scanning
15. A low contrast image has a ___ frequency.
read memory
low
window width
analog computers
16. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
1-2 lp/mm
memory
scanning or array detection
write memory
17. Around what time did digital computerization come out for CT and US?
Fourier Transformation
200 - 500-1000
1970s-1990s
software
18. Computer equipment is called what?
high
CD or DVD
frequency - contrast - and noise
hardware
19. What changes the pixel value by addition or subtraction and controls image density?
progressive scanning
window level
32
raster scan pattern
20. What is the information stored as magnetic variations referred to as?
frequency - contrast - and noise
high
memory
shades of gray
21. What are devices such as keyboard - touch screen monitors - and voice-activation that you put into or connect to a computer?
parallel - serial
Input devices
digital computers
CD or DVD
22. Computer programs are called what?
number of values displayed per image side
software
accentuates or suppresses
large amount
23. The quality of the data acquired from the IR is measured by what three data characteristics?
frequency - contrast - and noise
shades of gray
program
CD or DVD
24. Medical imaging is often achieved from information that has been processed by what?
number of values displayed per image side
scanning
analog-to-digital converters
slow scanning
25. Which memory can only be extracted without alteration; cannot change?
TV camera
read memory
byte
DICOM standard
26. What is the raw data to which a Fourier Transformation is applied to create the digital image?
frequency
smoothing
digital imaging and communication in medicine
voxel
27. 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
frequency
TV camera
DICOM standard
28. What is the raw data to which a Fourier Transformation is applied to create the digital image?
ENIAC
read memory
frequency
byte
29. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
DICOM standard
large amount
computer - radiographer
numerical value
30. What is the random background information that does not contribute to the image quality?
progressive scanning
noise
hardware
array detection
31. What is the equation for determining gray scale bit depth?
DICOM standard
RAM - ROM
smaller
2^x
32. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.
numerical value
frequency
transverse - sagittal - and coronal
binary machine
33. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
pixel size
bus
ROM
peripherals
34. 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?
electronic sources
data
DICOM standard
2^x
35. A low contrast image has a ___ frequency.
low
computer - radiographer
software
scanning or array detection
36. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.
gray scale bit depth
inverse
binary machine
low-pass filter
37. What is an individual matrix box or picture element?
monitors and printers
1960s
signal-to-noise ratio
pixel
38. The human visual range is ___ or fewer shades of gray.
pixel size
window level
32
Fourier Transformation
39. When detectors acquire their information through ____ they are receiving all the info at once.
array detection
200 - 500-1000
voxel
signal-to-noise ratio
40. Modalities differ in bit depth that is available depending on the capabilities of what?
increase
IR
bus
health level 7
41. What input device do radiographers use on a normal basis?
accentuates or suppresses
IRs
signal-to-noise ratio
bus
42. A high contrast image has a ___ frequency.
high
data
shades of gray
ENIAC
43. Binary systems operate with a ___-symbol language.
number of values displayed per image side
on
two
analog computers
44. What is the primary limitation with the resolution on digital images?
program
expansion or compression
raster scan pattern
magnetic tape
45. The _____ the matrix size - the better the resolution.
shades of gray
high
greater
voxel
46. 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?
direct
transverse - sagittal - and coronal
fine
central processing unit
47. The quality of the data acquired from the IR is measured by what three data characteristics?
CPU - Bus
bus
1960s
frequency - contrast - and noise
48. What type of scanning increases resolution but can't be used in real-time dynamic studies?
slow scanning
greater
DICOM standard
10 megabyte
49. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?
little
filtering
decrease
2^x
50. When was ENIAC invented?
data
two
1945
ENIAC