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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. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
digital imaging and communication in medicine
DICOM standard
1-2 lp/mm
monitors and printers
2. 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?
parallel - serial
expansion or compression
progressive scanning
bus
3. What is an individual matrix box or picture element?
analog-to-digital converters
pixel
digital imaging and communication in medicine
little
4. Which type of information consists of operating instructions?
program
matrix size
slow scanning
frequency
5. 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.
1940s
window
detector
mathematical theory - solid-state electronics - and microchip technology
6. What determines resolution?
pixel size
window width
array detection
1945
7. When detectors acquire their information by ____ they are receiving info from a specific area.
scanning
reduces
hardware
1970s-1990s
8. What is the equation for determining gray scale bit depth?
signal-to-noise ratio
1000+
DICOM standard
2^x
9. What is high-pass filtering also called?
raster scan pattern
analog computers
edge enhancement filtering or sharpening
program
10. What is the frequency response of the incoming signal called?
bandwidth
IRs
1970s-1990s
band-pass filtering
11. Digital detectors are capable of producing ______ shades of gray.
reduces
low-pass filter
1000+
on
12. Medical imaging is often achieved from information that has been processed by what?
write memory
analog-to-digital converters
progressive scanning
byte
13. What determines resolution?
program
number of values displayed per image side
read memory
pixel size
14. What is a specialized computer that functions as a peripheral and uses CPU memory to perform mathematical operations at extremely high speed?
accentuates or suppresses
array processors
shades of gray
array detection
15. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
filtering
smoothing
scanning or array detection
bus
16. Increased noise = _____ image contrast.
pixel size
byte
decreased
smoothing
17. What provides specific instructions for calculations and sequential steps to be followed?
peripherals
progressive scanning
software
voltage
18. Which computers handle data composed of continuously varying electrical currents?
smoothing
large amount
analog computers
increase
19. A high contrast image has a ___ frequency.
high
bit
pixel
Fourier Transformation
20. What type of scanning increases resolution slightly by scanning all 525 lines in order?
matrix size
progressive scanning
TV camera
Input devices
21. 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.
low-pass - band-pass - and high-pass
high-pass filtering
window width
1940s
22. What type of scanning increases resolution but can't be used in real-time dynamic studies?
shades of gray
slow scanning
low
digital computers
23. Which computers handle data composed of definite quantities of current?
digital computers
window level
computers
ENIAC
24. The quality of the data acquired from the IR is measured by what three data characteristics?
DICOM standard
frequency - contrast - and noise
computers
pixel
25. 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
200 - 500-1000
direct
on
26. What is the frequency response of the incoming signal called?
1000+
central processing unit
IR
bandwidth
27. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
window level
software
ROM
matrix size
28. Fluoroscopic noise mostly comes from what?
greater
edge enhancement filtering or sharpening
electronic sources
high
29. A low contrast image has a ___ frequency.
bus
gray scale bit depth
low
RAM - ROM
30. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.
decrease
parallel - serial
scanning or array detection
computer - radiographer
31. Fluoroscopic noise mostly comes from what?
1-2 lp/mm
1960s
electronic sources
RAM
32. Binary systems operate with a ___-symbol language.
1940s
two
matrix
progressive scanning
33. What is the random background information that does not contribute to the image quality?
noise
digital computers
smoothing
numerical value
34. When was ENIAC invented?
window width
ENIAC
1945
edge enhancement filtering or sharpening
35. What is the 'noisiest' component of a digital system?
software
TV camera
abacus
1940s
36. What is the information stored as magnetic variations referred to as?
1970s-1990s
numerical value
memory
numerical value
37. What is the name of the 'modern electronic computer'?
RAM - ROM
programs and data
central processing unit
ENIAC
38. Window width and contrast have an ____ relationship.
frequency - contrast - and noise
inverse
mathematical theory - solid-state electronics - and microchip technology
central processing unit
39. Which memory can only be extracted without alteration; cannot change?
1945
read memory
inverse
pixel
40. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
progressive scanning
large amount
mathematical theory - solid-state electronics - and microchip technology
expansion or compression
41. When detectors acquire their information through ____ they are receiving all the info at once.
digital computers
array detection
IR
0 - 1
42. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?
frequency - contrast - and noise
1960s
numerical values
magnetic tape
43. What does a 0 in binary code stand for?
scanning
off
software
noise
44. What type of scanning increases resolution slightly by scanning all 525 lines in order?
computer - radiographer
pixel
progressive scanning
200 - 500-1000
45. What changes the pixel value by multiplication or division and controls image contrast?
RAM - ROM
window width
analog-to-digital converters
high
46. The ____ is the heart of the computer while the ___ is the vessels.
expansion or compression
bus
CPU - Bus
low-pass - band-pass - and high-pass
47. When detectors acquire their information by ____ they are receiving info from a specific area.
ENIAC
array processors
little
scanning
48. What is accomplished by transforming the image into frequencies and making mathematical alteration to reproduce the image?
filtering
contrast
voltage
smoothing
49. What does DICOM stand for?
digital imaging and communication in medicine
high
1-2 lp/mm
signal-to-noise ratio
50. What is high-pass filtering also called?
200 - 500-1000
edge enhancement filtering or sharpening
low
reduces