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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 are the two most common output devices?
monitors and printers
programs and data
DICOM standard
health level 7
2. When detectors acquire their information by ____ they are receiving info from a specific area.
digital image
expansion or compression
scanning
digital imaging and communication in medicine
3. What 3 things were required prior to digital computer applications in medical imaging?
little
mathematical theory - solid-state electronics - and microchip technology
0 - 1
filtering
4. 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
contrast
numerical value
2^x
5. 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?
IRs
frequency - contrast - and noise
transverse - sagittal - and coronal
two
6. What type of scanning increases resolution but can't be used in real-time dynamic studies?
program
signal-to-noise ratio
slow scanning
decreased
7. What is the random background information that does not contribute to the image quality?
low-pass - band-pass - and high-pass
central processing unit
noise
TV camera
8. What permit input/output of information to or from the CPU?
window width
noise
little
peripherals
9. What are the two types of information computers use?
programs and data
smoothing
detector
Fourier Transformation
10. There is a ___ relationship between subject contrast and acquired data contrast.
direct
10 megabyte
band-pass filtering
software
11. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?
filtering
bit
1000+
1000+
12. Around what time did digital computerization come out for CT and US?
digital computers
1970s-1990s
pixel
computer - radiographer
13. A __ _____ disk will store over 10000000 bytes of information.
1970s-1990s
detector
parallel - serial
10 megabyte
14. What modalities are array processors useful for?
low-pass - band-pass - and high-pass
pixel
CT and MRI
high-pass filtering
15. What is a specialized computer that functions as a peripheral and uses CPU memory to perform mathematical operations at extremely high speed?
array processors
Fourier Transformation
read memory
matrix
16. The human visual range is ___ or fewer shades of gray.
high
signal-to-noise ratio
32
transverse - sagittal - and coronal
17. What does a 0 in binary code stand for?
on
off
programs and data
smaller
18. A high S/N indicates ___ noise in the image.
central processing unit
off
little
CT and MRI
19. What changes the pixel value by addition or subtraction and controls image density?
window level
RAM - ROM
array processors
detector
20. What is the frequency response of the incoming signal called?
decrease
parallel - serial
bandwidth
program
21. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
programs and data
1-2 lp/mm
data
high
22. What is required for collection of input information?
0 - 1
peripherals
computer - radiographer
detector
23. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?
magnetic tape
IRs
peripherals
pixel
24. What is an image that has been converted into numerical values for transmission or processing?
filtering
IRs
digital image
low
25. Noise is ____ related to contrast.
array detection
1-2 lp/mm
computer - radiographer
inversely
26. The number of shades of gray is determined by what?
pixel
detector
gray scale bit depth
200 - 500-1000
27. What type of scanning increases resolution but can't be used in real-time dynamic studies?
slow scanning
ENIAC
numerical value
RAM - ROM
28. In what time period did mathematical theory and solid-state electronics come out?
computers
little
1940s
RAM - ROM
29. What is the 'heart' of every computer?
CD or DVD
mathematical theory - solid-state electronics - and microchip technology
abacus
central processing unit
30. Each pixel is capable of representing a wide range of what?
expansion or compression
shades of gray
large amount
array processors
31. What are devices that process information?
computers
expansion or compression
electronic sources
CPU - Bus
32. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.
magnetic tape
bit
low-pass filter
CD or DVD
33. The computer either ____ or ____ selected frequencies during the filtering process.
detector
filtering
200 - 500-1000
accentuates or suppresses
34. What provides specific instructions for calculations and sequential steps to be followed?
greater
slow scanning
software
IR
35. Which memory can only be extracted without alteration; cannot change?
window width
read memory
analog-to-digital converters
bus
36. When was ENIAC invented?
1-2 lp/mm
bit
low-pass - band-pass - and high-pass
1945
37. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.
band-pass filtering
software
numerical value
low
38. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
detector
1-2 lp/mm
shades of gray
program
39. What is the mathematical algorithm used to create all medical images?
analog computers
Fourier Transformation
inversely
number of values displayed per image side
40. What is the name of the 'modern electronic computer'?
signal-to-noise ratio
numerical values
ENIAC
1970s-1990s
41. What is the equation for determining gray scale bit depth?
smoothing
off
0 - 1
2^x
42. Changes in window width are sometimes called gray scale ____ or ____.
DICOM standard
frequency
expansion or compression
memory
43. Digital detectors are capable of producing ______ shades of gray.
bus
binary machine
1000+
byte
44. What is the 'noisiest' component of a digital system?
progressive scanning
filtering
TV camera
frequency - contrast - and noise
45. Around what time did digital computerization come out for CT and US?
1970s-1990s
signal-to-noise ratio
computers
1000+
46. What is the mathematical algorithm used to create all medical images?
bus
bit
Fourier Transformation
TV camera
47. What is the raw data to which a Fourier Transformation is applied to create the digital image?
frequency
bit
computer - radiographer
bus
48. 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.
high-pass filtering
1000+
scanning or array detection
byte
49. 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?
data
programs and data
RAM - ROM
transverse - sagittal - and coronal
50. What is critical to how fast the computer system can function?
contrast
bus speed
high
1000+