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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 type of memory storage devices are required for large amounts of data?
two
programs and data
CD or DVD
digital imaging and communication in medicine
2. What is the name for an 8-bit word?
byte
smoothing
software
pixel
3. What is the 'heart' of every computer?
central processing unit
low-pass filter
voltage
analog computers
4. The _____ the matrix size - the better the resolution.
greater
IRs
increase
noise
5. Computerized digital images are described in terms of what
ROM
number of values displayed per image side
noise
voxel
6. There is a ___ relationship between subject contrast and acquired data contrast.
fine
direct
mathematical theory - solid-state electronics - and microchip technology
digital image
7. What is critical to how fast the computer system can function?
pixel
scanning
byte
bus speed
8. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
RAM
window level
gray scale bit depth
CT and MRI
9. A low contrast image has a ___ frequency.
low
noise
RAM - ROM
pixel
10. 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?
reduces
magnetic tape
filtering
health level 7
11. What does a 0 in binary code stand for?
CT and MRI
off
smoothing
parallel - serial
12. The number of shades of gray is determined by what?
matrix size
write memory
high
gray scale bit depth
13. What is the name for an 8-bit word?
computers
Fourier Transformation
byte
scanning
14. What is required for collection of input information?
direct
high
frequency - contrast - and noise
detector
15. Commercial units scan only 262.5 lines out of 525 in each pass thus producing ____ for diagnostic imaging.
DICOM standard
fine
peripherals
1-2 lp/mm
16. Window width and contrast have an ____ relationship.
1000+
inverse
DICOM standard
decrease
17. What does DICOM stand for?
programs and data
data
array processors
digital imaging and communication in medicine
18. What is the information stored as magnetic variations referred to as?
increase
direct
memory
numerical values
19. What is the mathematical algorithm used to create all medical images?
high-pass filtering
inverse
contrast
Fourier Transformation
20. What input device do radiographers use on a normal basis?
slow scanning
digital image
central processing unit
IRs
21. Extremely narrow window width requires the computer to ignore a ___ ____ of data outside the chosen range.
scanning
programs and data
scanning
large amount
22. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
software
voltage
array processors
200 - 500-1000
23. Changes in window width are sometimes called gray scale ____ or ____.
monitors and printers
large amount
window width
expansion or compression
24. A __ _____ disk will store over 10000000 bytes of information.
10 megabyte
voxel
numerical value
window level
25. What is the name for a binary digit?
frequency
bit
matrix size
low-pass - band-pass - and high-pass
26. What is high-pass filtering also called?
peripherals
byte
edge enhancement filtering or sharpening
IR
27. A high contrast image has a ___ frequency.
1970s-1990s
matrix size
high
10 megabyte
28. Which memory can only be extracted without alteration; cannot change?
read memory
peripherals
digital imaging and communication in medicine
abacus
29. What directs information to and from various parts of the computer?
bit
magnetic tape
central processing unit
write memory
30. What type of scanning increases resolution slightly by scanning all 525 lines in order?
RAM
progressive scanning
byte
matrix size
31. When power is turned off - (ROM / RAM) is erased and (ROM / RAM) is maintained
array detection
slow scanning
RAM - ROM
band-pass filtering
32. Binary systems operate with a ___-symbol language.
high
peripherals
two
noise
33. All medical imaging is achieved with which type of computers?
CD or DVD
byte
digital computers
high
34. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
bus
hardware
monitors and printers
low
35. Electrical connections between the CPU and the other components rung along a system of series or parallel conductors called what?
high-pass filtering
bus
peripherals
digital imaging and communication in medicine
36. Which memory replaces new information with the old; can change?
32
parallel - serial
write memory
2^x
37. Each box of an image matrix will display a ____ ____ which can be transformed into a visual brightness or density level.
bus
computers
numerical value
increase
38. What does a 1 in binary code stand for?
low-pass - band-pass - and high-pass
on
software
0 - 1
39. Computers operate from ____ ____ language.
direct
ENIAC
binary machine
voltage
40. A larger matrix provides ____ pixels.
health level 7
off
smaller
numerical values
41. What changes the pixel value by multiplication or division and controls image contrast?
200 - 500-1000
window width
slow scanning
magnetic tape
42. A larger matrix provides ____ pixels.
decrease
IR
detector
smaller
43. The quality of the data acquired from the IR is measured by what three data characteristics?
1000+
frequency - contrast - and noise
large amount
slow scanning
44. Noise is ____ related to contrast.
shades of gray
little
bandwidth
inversely
45. What is an individual matrix box or picture element?
pixel size
pixel
array processors
Fourier Transformation
46. What is the equation for determining gray scale bit depth?
2^x
fine
peripherals
high
47. 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?
on
window
transverse - sagittal - and coronal
IR
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.
memory
high-pass filtering
pixel
central processing unit
49. What are the 3 classifications of digitized image filters?
low-pass - band-pass - and high-pass
accentuates or suppresses
greater
memory
50. Which computers handle data composed of continuously varying electrical currents?
hardware
CT and MRI
analog computers
decreased