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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 types of information computers use?
high-pass filtering
programs and data
frequency - contrast - and noise
magnetic tape
2. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?
RAM
health level 7
increase
peripherals
3. 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.
digital computers
numerical value
central processing unit
window
4. If window width increases - image contrast will ____.
software
decrease
1960s
CT and MRI
5. Computers operate from ____ ____ language.
binary machine
gray scale bit depth
array processors
greater
6. What are the 3 classifications of digitized image filters?
ENIAC
inversely
low-pass - band-pass - and high-pass
analog-to-digital converters
7. When detectors acquire their information by ____ they are receiving info from a specific area.
DICOM standard
RAM - ROM
decrease
scanning
8. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
progressive scanning
voxel
electronic sources
two
9. What modalities are array processors useful for?
DICOM standard
CT and MRI
Input devices
off
10. Which computers handle data composed of continuously varying electrical currents?
detector
2^x
analog computers
central processing unit
11. Digitalization of analog information (increases / reduces) the quality and quantity of information?
CPU - Bus
reduces
inverse
slow scanning
12. Computer memory is often rated in terms of total ____ memory.
byte
hardware
RAM
greater
13. What is the random background information that does not contribute to the image quality?
little
number of values displayed per image side
noise
32
14. What 3 things were required prior to digital computer applications in medical imaging?
inverse
gray scale bit depth
abacus
mathematical theory - solid-state electronics - and microchip technology
15. Medical imaging is often achieved from information that has been processed by what?
central processing unit
fine
analog-to-digital converters
Fourier Transformation
16. The _____ the matrix size - the better the resolution.
array processors
little
array processors
greater
17. Computer programs are called what?
inverse
data
scanning
software
18. A larger matrix provides ____ pixels.
little
signal-to-noise ratio
smaller
low-pass filter
19. What is the measure of the differences between the data values referred to as?
digital image
contrast
byte
high-pass filtering
20. What is critical to how fast the computer system can function?
scanning or array detection
program
1940s
bus speed
21. All medical imaging is achieved with which type of computers?
1945
pixel size
array processors
digital computers
22. When detectors acquire their information through ____ they are receiving all the info at once.
array detection
pixel size
inversely
mathematical theory - solid-state electronics - and microchip technology
23. Window width and contrast have an ____ relationship.
inverse
hardware
RAM
two
24. Fluoroscopic noise mostly comes from what?
electronic sources
numerical value
200 - 500-1000
CD or DVD
25. 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?
smaller
scanning or array detection
DICOM standard
low
26. A high S/N indicates ___ noise in the image.
shades of gray
window
little
Input devices
27. What input device do radiographers use on a normal basis?
IRs
matrix size
RAM
analog-to-digital converters
28. 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?
central processing unit
on
transverse - sagittal - and coronal
inversely
29. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?
peripherals
electronic sources
ENIAC
window width
30. Computers operate from ____ ____ language.
health level 7
binary machine
Input devices
IR
31. ____ circuits permit simultaneous transmission of information while ____ circuits transmit sequentially.
parallel - serial
1-2 lp/mm
computer - radiographer
IRs
32. Computer equipment is called what?
hardware
off
shades of gray
RAM - ROM
33. Which type of information consists of operating instructions?
program
software
progressive scanning
IR
34. What does a 0 in binary code stand for?
shades of gray
0 - 1
smoothing
off
35. In what time period did mathematical theory and solid-state electronics come out?
0 - 1
memory
1940s
Input devices
36. What is required for collection of input information?
Input devices
detector
2^x
RAM
37. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
bit
numerical values
bus speed
pixel size
38. What type of scanning increases resolution slightly by scanning all 525 lines in order?
progressive scanning
IRs
peripherals
health level 7
39. Window width and contrast have an ____ relationship.
scanning
inverse
hardware
raster scan pattern
40. What determines resolution?
numerical values
analog-to-digital converters
high-pass filtering
pixel size
41. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?
abacus
magnetic tape
0 - 1
contrast
42. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
low
array processors
data
RAM - ROM
43. The number of shades of gray is determined by what?
data
Input devices
numerical value
gray scale bit depth
44. A larger matrix provides ____ pixels.
smaller
digital computers
transverse - sagittal - and coronal
numerical values
45. A low contrast image has a ___ frequency.
low
digital computers
magnetic tape
voltage
46. What is the 'noisiest' component of a digital system?
low-pass - band-pass - and high-pass
scanning
peripherals
TV camera
47. Noise is ____ related to contrast.
inversely
computer - radiographer
inverse
data
48. What are devices that process information?
computer - radiographer
CT and MRI
raster scan pattern
computers
49. What directs information to and from various parts of the computer?
central processing unit
bandwidth
digital computers
Input devices
50. What is the raw data to which a Fourier Transformation is applied to create the digital image?
gray scale bit depth
frequency
expansion or compression
scanning