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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 is the raw data to which a Fourier Transformation is applied to create the digital image?
frequency
CT and MRI
byte
transverse - sagittal - and coronal
2. Modalities differ in bit depth that is available depending on the capabilities of what?
byte
band-pass filtering
voltage
IR
3. What is required for collection of input information?
number of values displayed per image side
ENIAC
little
detector
4. What was the earliest computer device called?
shades of gray
IR
peripherals
abacus
5. Increased noise = _____ image contrast.
decreased
numerical value
10 megabyte
central processing unit
6. 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.
TV camera
window
on
parallel - serial
7. What type of memory storage device is inexpensive and the data is stored serially (difficult to access)?
noise
magnetic tape
transverse - sagittal - and coronal
contrast
8. A __ _____ disk will store over 10000000 bytes of information.
low-pass filter
10 megabyte
health level 7
voxel
9. Computerized digital images are described in terms of what
number of values displayed per image side
Fourier Transformation
magnetic tape
software
10. The _____ the matrix size - the better the resolution.
direct
high-pass filtering
greater
fine
11. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
health level 7
analog-to-digital converters
CD or DVD
numerical values
12. Which memory replaces new information with the old; can change?
1960s
write memory
computers
increase
13. What input device do radiographers use on a normal basis?
32
1000+
IRs
10 megabyte
14. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
voxel
200 - 500-1000
software
magnetic tape
15. If window width increases - image contrast will ____.
signal-to-noise ratio
10 megabyte
1-2 lp/mm
decrease
16. Window width and contrast have an ____ relationship.
central processing unit
bus
inverse
program
17. Which type of information consists of collected facts?
byte
DICOM standard
1-2 lp/mm
data
18. What is the information stored as magnetic variations referred to as?
data
memory
ENIAC
CPU - Bus
19. 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?
pixel
central processing unit
CPU - Bus
DICOM standard
20. Resolution is controlled by what?
scanning
matrix size
read memory
CPU - Bus
21. Which computers handle data composed of continuously varying electrical currents?
filtering
analog computers
software
window
22. 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
1-2 lp/mm
matrix size
two
23. Noise is measured as what?
filtering
frequency
CPU - Bus
signal-to-noise ratio
24. Increased noise = _____ image contrast.
IRs
binary machine
ROM
decreased
25. What input device do radiographers use on a normal basis?
central processing unit
high
IRs
DICOM standard
26. What is the random background information that does not contribute to the image quality?
Input devices
digital imaging and communication in medicine
low-pass - band-pass - and high-pass
noise
27. The number of shades of gray is determined by what?
gray scale bit depth
direct
window width
low-pass - band-pass - and high-pass
28. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
Input devices
number of values displayed per image side
2^x
smoothing
29. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
200 - 500-1000
pixel
fine
bit
30. Fluoroscopic noise mostly comes from what?
electronic sources
inverse
scanning or array detection
monitors and printers
31. What is the random background information that does not contribute to the image quality?
ENIAC
noise
contrast
parallel - serial
32. A high S/N indicates ___ noise in the image.
little
slow scanning
shades of gray
number of values displayed per image side
33. What is the process used in low-pass filtering that is accomplished by averaging adjacent pixels values?
smoothing
high-pass filtering
two
off
34. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
fine
direct
voxel
window
35. What are the 3 classifications of digitized image filters?
low-pass - band-pass - and high-pass
slow scanning
decrease
read memory
36. Changes in window width are sometimes called gray scale ____ or ____.
inversely
expansion or compression
1970s-1990s
numerical values
37. What is the name of the 'modern electronic computer'?
program
large amount
digital computers
ENIAC
38. What is the 'random-access' memory that usually functions as temporary storage for programming and operating instructions during use and is constantly changed/?
array processors
RAM
matrix size
two
39. What does DICOM stand for?
off
edge enhancement filtering or sharpening
digital imaging and communication in medicine
memory
40. What can memory be transferred as?
RAM
central processing unit
voltage
CD or DVD
41. What determines resolution?
computer - radiographer
numerical values
pixel size
window
42. What is critical to how fast the computer system can function?
0 - 1
binary machine
bus speed
2^x
43. The _____ the matrix size - the better the resolution.
pixel size
high
greater
expansion or compression
44. Digitalization of analog information (increases / reduces) the quality and quantity of information?
pixel size
200 - 500-1000
32
reduces
45. Medical imaging is often achieved from information that has been processed by what?
on
analog-to-digital converters
CPU - Bus
slow scanning
46. What does DICOM stand for?
central processing unit
magnetic tape
smaller
digital imaging and communication in medicine
47. Computer programs are called what?
software
filtering
RAM
smaller
48. What permit input/output of information to or from the CPU?
direct
inverse
signal-to-noise ratio
peripherals
49. What modalities are array processors useful for?
large amount
frequency - contrast - and noise
CT and MRI
expansion or compression
50. When subject contrast is high - the acquired data contrast will be ____.
raster scan pattern
bus speed
high
IR