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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 primary limitation with the resolution on digital images?
matrix size
raster scan pattern
matrix size
smoothing
2. What is high-pass filtering also called?
edge enhancement filtering or sharpening
pixel
abacus
1960s
3. What is the mathematical algorithm used to create all medical images?
direct
software
filtering
Fourier Transformation
4. 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.
bit
bandwidth
smaller
high-pass filtering
5. What are devices that process information?
computers
bus
high-pass filtering
peripherals
6. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
bus speed
32
voxel
peripherals
7. Noise is measured as what?
1970s-1990s
IRs
gray scale bit depth
signal-to-noise ratio
8. A larger matrix provides ____ pixels.
numerical values
voxel
smaller
noise
9. What is the name of the 'modern electronic computer'?
computer - radiographer
bit
ENIAC
digital imaging and communication in medicine
10. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
RAM - ROM
1-2 lp/mm
TV camera
number of values displayed per image side
11. What is the name for a binary digit?
Input devices
TV camera
bit
decreased
12. Resolution is controlled by what?
peripherals
matrix size
pixel
binary machine
13. What does DICOM stand for?
CT and MRI
program
digital imaging and communication in medicine
signal-to-noise ratio
14. What is required for collection of input information?
detector
raster scan pattern
RAM - ROM
32
15. What is high-pass filtering also called?
32
computer - radiographer
edge enhancement filtering or sharpening
1960s
16. When subject contrast is high - the acquired data contrast will be ____.
accentuates or suppresses
programs and data
high
1945
17. 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?
reduces
RAM - ROM
health level 7
Fourier Transformation
18. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
32
computer - radiographer
large amount
bus
19. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.
200 - 500-1000
direct
programs and data
low-pass filter
20. There is a ___ relationship between subject contrast and acquired data contrast.
data
little
1-2 lp/mm
direct
21. Computer programs are called what?
abacus
raster scan pattern
memory
software
22. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
inversely
computers
1000+
fine
23. Digital detectors are capable of producing ______ shades of gray.
1000+
200 - 500-1000
computers
scanning or array detection
24. What is an individual matrix box or picture element?
pixel
1000+
0 - 1
parallel - serial
25. What is the random background information that does not contribute to the image quality?
programs and data
noise
on
fine
26. What directs information to and from various parts of the computer?
central processing unit
frequency
high-pass filtering
window level
27. What is the 'noisiest' component of a digital system?
large amount
inversely
TV camera
accentuates or suppresses
28. What are devices that process information?
computers
numerical value
scanning or array detection
digital imaging and communication in medicine
29. What type of scanning increases resolution but can't be used in real-time dynamic studies?
slow scanning
scanning or array detection
numerical value
decreased
30. A high S/N indicates ___ noise in the image.
digital computers
little
low-pass - band-pass - and high-pass
peripherals
31. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
byte
RAM - ROM
computers
pixel
32. Around what time did digital computerization come out for CT and US?
CD or DVD
1970s-1990s
CPU - Bus
slow scanning
33. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?
window level
shades of gray
peripherals
monitors and printers
34. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
ROM
inversely
1940s
matrix
35. Modalities differ in bit depth that is available depending on the capabilities of what?
shades of gray
IR
byte
window
36. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
number of values displayed per image side
CT and MRI
1-2 lp/mm
bandwidth
37. Medical imaging is often achieved from information that has been processed by what?
scanning or array detection
DICOM standard
central processing unit
analog-to-digital converters
38. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
decrease
pixel size
inversely
smoothing
39. What is an image that has been converted into numerical values for transmission or processing?
digital image
inversely
health level 7
binary machine
40. 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?
1960s
hardware
programs and data
transverse - sagittal - and coronal
41. Computer memory is often rated in terms of total ____ memory.
IRs
RAM
byte
matrix
42. What is critical to how fast the computer system can function?
32
binary machine
bus speed
little
43. Computer equipment is called what?
health level 7
window level
hardware
ENIAC
44. What is the information stored as magnetic variations referred to as?
memory
bus
greater
mathematical theory - solid-state electronics - and microchip technology
45. Which computers handle data composed of definite quantities of current?
digital computers
smoothing
abacus
high-pass filtering
46. All medical imaging is achieved with which type of computers?
off
direct
program
digital computers
47. A __ _____ disk will store over 10000000 bytes of information.
10 megabyte
pixel size
2^x
1-2 lp/mm
48. Digitalization of analog information (increases / reduces) the quality and quantity of information?
window width
digital imaging and communication in medicine
reduces
pixel
49. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.
numerical values
digital image
numerical value
bit
50. What can memory be transferred as?
voltage
health level 7
array processors
2^x