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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. Computers operate from ____ ____ language.
frequency - contrast - and noise
window
numerical value
binary machine
2. What is critical to how fast the computer system can function?
binary machine
slow scanning
10 megabyte
bus speed
3. What can memory be transferred as?
analog-to-digital converters
CT and MRI
voltage
analog-to-digital converters
4. Noise is measured as what?
computers
signal-to-noise ratio
filtering
200 - 500-1000
5. What is the equation for determining gray scale bit depth?
peripherals
2^x
digital computers
off
6. Medical imaging is often achieved from information that has been processed by what?
filtering
noise
CD or DVD
analog-to-digital converters
7. What type of memory storage devices are required for large amounts of data?
greater
CD or DVD
low
detector
8. When was ENIAC invented?
bus
window
1945
peripherals
9. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
numerical values
electronic sources
numerical value
detector
10. Noise is measured as what?
software
1000+
edge enhancement filtering or sharpening
signal-to-noise ratio
11. What is the information stored as magnetic variations referred to as?
inversely
RAM - ROM
memory
program
12. What provides specific instructions for calculations and sequential steps to be followed?
1960s
voxel
software
peripherals
13. What is critical to how fast the computer system can function?
frequency
binary machine
bus speed
bus
14. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
large amount
window width
decrease
noise
15. All medical imaging is achieved with which type of computers?
reduces
two
digital computers
detector
16. A high contrast image has a ___ frequency.
programs and data
bus
data
high
17. What was the earliest computer device called?
memory
digital imaging and communication in medicine
digital image
abacus
18. Computer programs are called what?
raster scan pattern
software
memory
window level
19. Which computers handle data composed of definite quantities of current?
digital computers
analog computers
TV camera
matrix
20. 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.
byte
window
number of values displayed per image side
window width
21. Digital detectors are capable of producing ______ shades of gray.
array processors
0 - 1
1000+
computer - radiographer
22. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.
matrix size
program
read memory
low-pass filter
23. What are the two types of information computers use?
mathematical theory - solid-state electronics - and microchip technology
programs and data
bus
smoothing
24. What 3 things were required prior to digital computer applications in medical imaging?
analog-to-digital converters
Input devices
mathematical theory - solid-state electronics - and microchip technology
software
25. Which type of information consists of collected facts?
noise
data
large amount
on
26. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
200 - 500-1000
frequency
analog computers
software
27. Increased noise = _____ image contrast.
decreased
numerical values
gray scale bit depth
1945
28. What is the raw data to which a Fourier Transformation is applied to create the digital image?
1945
frequency - contrast - and noise
CPU - Bus
frequency
29. What is the equation for determining gray scale bit depth?
2^x
Input devices
low
Fourier Transformation
30. The number of shades of gray is determined by what?
1-2 lp/mm
gray scale bit depth
window
1945
31. What are the two most common output devices?
monitors and printers
frequency
central processing unit
computers
32. Window width and contrast have an ____ relationship.
inversely
array detection
RAM - ROM
inverse
33. What modalities are array processors useful for?
1960s
smaller
shades of gray
CT and MRI
34. The _____ the matrix size - the better the resolution.
IR
monitors and printers
raster scan pattern
greater
35. A high S/N indicates ___ noise in the image.
scanning
little
data
gray scale bit depth
36. The number of shades of gray is determined by what?
matrix size
gray scale bit depth
computers
digital imaging and communication in medicine
37. Who or What is responsible for density changes on a digital image? On a manual image
low-pass - band-pass - and high-pass
high-pass filtering
numerical value
computer - radiographer
38. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?
transverse - sagittal - and coronal
write memory
peripherals
pixel size
39. Each pixel is capable of representing a wide range of what?
large amount
shades of gray
numerical values
Input devices
40. In what time period did mathematical theory and solid-state electronics come out?
gray scale bit depth
1940s
voxel
shades of gray
41. A low contrast image has a ___ frequency.
voltage
low
direct
number of values displayed per image side
42. What determines resolution?
high-pass filtering
high
pixel size
smoothing
43. 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?
noise
bus
0 - 1
central processing unit
44. Computer memory is often rated in terms of total ____ memory.
edge enhancement filtering or sharpening
fine
byte
ENIAC
45. Binary systems operate with a ___-symbol language.
number of values displayed per image side
programs and data
two
software
46. What is the measure of the differences between the data values referred to as?
pixel size
contrast
programs and data
expansion or compression
47. When subject contrast is high - the acquired data contrast will be ____.
high
bus speed
byte
reduces
48. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
frequency
10 megabyte
two
RAM
49. All medical imaging is achieved with which type of computers?
digital computers
matrix
numerical values
accentuates or suppresses
50. What changes the pixel value by multiplication or division and controls image contrast?
pixel size
2^x
on
window width