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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. 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.
transverse - sagittal - and coronal
high-pass filtering
numerical value
window
2. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
progressive scanning
1960s
large amount
pixel size
3. The computer either ____ or ____ selected frequencies during the filtering process.
low
IR
signal-to-noise ratio
accentuates or suppresses
4. Resolution is controlled by what?
matrix size
RAM - ROM
DICOM standard
contrast
5. Modalities differ in bit depth that is available depending on the capabilities of what?
program
numerical value
IR
1000+
6. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
1945
accentuates or suppresses
voxel
peripherals
7. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.
bus speed
inversely
numerical value
write memory
8. What is the mathematical algorithm used to create all medical images?
programs and data
IR
2^x
Fourier Transformation
9. The human visual range is ___ or fewer shades of gray.
little
software
32
array processors
10. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
detector
program
1-2 lp/mm
programs and data
11. What does DICOM stand for?
gray scale bit depth
software
increase
digital imaging and communication in medicine
12. Digital detectors are capable of producing ______ shades of gray.
central processing unit
1-2 lp/mm
computers
1000+
13. What type of scanning increases resolution slightly by scanning all 525 lines in order?
progressive scanning
analog computers
ENIAC
digital imaging and communication in medicine
14. What is an individual matrix box or picture element?
analog computers
programs and data
monitors and printers
pixel
15. What does a 0 in binary code stand for?
computer - radiographer
RAM - ROM
frequency
off
16. What does DICOM stand for?
digital imaging and communication in medicine
filtering
shades of gray
high-pass filtering
17. Around what time did digital computerization come out for CT and US?
1970s-1990s
low
programs and data
reduces
18. What 3 things were required prior to digital computer applications in medical imaging?
mathematical theory - solid-state electronics - and microchip technology
1940s
filtering
CT and MRI
19. Resolution is controlled by what?
pixel size
window
matrix size
array processors
20. Which memory can only be extracted without alteration; cannot change?
read memory
digital image
increase
1970s-1990s
21. What is the name of the 'modern electronic computer'?
array detection
ENIAC
digital computers
bus
22. The ____ is the heart of the computer while the ___ is the vessels.
CPU - Bus
10 megabyte
detector
voltage
23. What is a square series of boxes that gives form to the image?
matrix
numerical value
increase
on
24. Noise is ____ related to contrast.
frequency
progressive scanning
inversely
ROM
25. What is the primary limitation with the resolution on digital images?
pixel
analog computers
contrast
raster scan pattern
26. Computerized digital images are described in terms of what
little
number of values displayed per image side
reduces
32
27. What is critical to how fast the computer system can function?
digital computers
bus speed
window width
frequency
28. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
bus
gray scale bit depth
expansion or compression
transverse - sagittal - and coronal
29. What changes the pixel value by multiplication or division and controls image contrast?
window width
computers
program
pixel
30. 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?
bus
inverse
inversely
decreased
31. What changes the pixel value by multiplication or division and controls image contrast?
window width
noise
hardware
decreased
32. 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?
signal-to-noise ratio
expansion or compression
bus speed
transverse - sagittal - and coronal
33. What does a 1 in binary code stand for?
on
greater
10 megabyte
TV camera
34. Computer equipment is called what?
hardware
monitors and printers
10 megabyte
array processors
35. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
shades of gray
computers
bus
central processing unit
36. Noise is measured as what?
transverse - sagittal - and coronal
1945
signal-to-noise ratio
matrix size
37. What type of scanning increases resolution but can't be used in real-time dynamic studies?
TV camera
IRs
number of values displayed per image side
slow scanning
38. What type of memory storage devices are required for large amounts of data?
filtering
CD or DVD
direct
memory
39. Who or What is responsible for density changes on a digital image? On a manual image
digital imaging and communication in medicine
raster scan pattern
program
computer - radiographer
40. If the window level increases - density will _____.
program
increase
health level 7
1945
41. What directs information to and from various parts of the computer?
10 megabyte
expansion or compression
central processing unit
high
42. Scanners - mouse - keyboard - input memory disk drive - and paper printers are all forms of what?
edge enhancement filtering or sharpening
peripherals
numerical value
central processing unit
43. A high S/N indicates ___ noise in the image.
magnetic tape
fine
little
byte
44. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
abacus
voltage
voxel
CD or DVD
45. Changes in window width are sometimes called gray scale ____ or ____.
expansion or compression
pixel size
array processors
off
46. If window width increases - image contrast will ____.
decrease
matrix size
window width
ENIAC
47. What is the name for an 8-bit word?
byte
1960s
accentuates or suppresses
digital computers
48. Which type of filter amplifies or deletes all but a selected range or band of frequencies and is useful in the elimination of characteristic emission peaks?
decrease
band-pass filtering
scanning or array detection
pixel size
49. The _____ the matrix size - the better the resolution.
greater
CPU - Bus
low-pass filter
little
50. Which type of filter amplifies or deletes all but low frequencies - appears to reduce contrast - and is often used to remove high frequency nose.
software
low-pass filter
direct
inversely