SUBJECTS
|
BROWSE
|
CAREER CENTER
|
POPULAR
|
JOIN
|
LOGIN
Business Skills
|
Soft Skills
|
Basic Literacy
|
Certifications
About
|
Help
|
Privacy
|
Terms
|
Email
Search
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. Around what time did digital computerization come out for CT and US?
Fourier Transformation
noise
abacus
1970s-1990s
2. What is the frequency response of the incoming signal called?
numerical values
hardware
bandwidth
little
3. Changes in window width are sometimes called gray scale ____ or ____.
matrix size
computers
digital image
expansion or compression
4. Which computers handle data composed of continuously varying electrical currents?
byte
TV camera
1-2 lp/mm
analog computers
5. The computer either ____ or ____ selected frequencies during the filtering process.
1-2 lp/mm
accentuates or suppresses
shades of gray
greater
6. What 3 things were required prior to digital computer applications in medical imaging?
slow scanning
mathematical theory - solid-state electronics - and microchip technology
1945
program
7. What is the equation for determining gray scale bit depth?
edge enhancement filtering or sharpening
2^x
low-pass filter
binary machine
8. What changes the pixel value by multiplication or division and controls image contrast?
little
inverse
window width
window level
9. What is an individual matrix box or picture element?
RAM - ROM
reduces
pixel
programs and data
10. What input device do radiographers use on a normal basis?
accentuates or suppresses
IRs
RAM
digital computers
11. What is the primary limitation with the resolution on digital images?
binary machine
bus
ROM
raster scan pattern
12. When was ENIAC invented?
program
TV camera
1945
bus speed
13. 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.
ENIAC
Fourier Transformation
window
central processing unit
14. What does a 1 in binary code stand for?
program
peripherals
on
central processing unit
15. What does a 0 in binary code stand for?
hardware
off
abacus
numerical values
16. Computer memory is often rated in terms of total ____ memory.
byte
voltage
off
software
17. Digital detectors are capable of producing ______ shades of gray.
decreased
shades of gray
1000+
electronic sources
18. Who or What is responsible for density changes on a digital image? On a manual image
smoothing
high
computer - radiographer
TV camera
19. What is the name of the 'modern electronic computer'?
matrix
1-2 lp/mm
ENIAC
peripherals
20. If window width increases - image contrast will ____.
read memory
analog computers
array detection
decrease
21. Commercial systems often have a S/N of ____ but the HR systems used in digital fluoro have a S/N between ________.
off
200 - 500-1000
gray scale bit depth
progressive scanning
22. A high contrast image has a ___ frequency.
2^x
array processors
high
frequency
23. What are the two most common output devices?
monitors and printers
number of values displayed per image side
write memory
abacus
24. Noise is measured as what?
signal-to-noise ratio
health level 7
2^x
raster scan pattern
25. What can memory be transferred as?
number of values displayed per image side
magnetic tape
1970s-1990s
voltage
26. In medical imaging - each pixel value corresponds to a 3-D volume of tissue known as what?
programs and data
voxel
decreased
pixel size
27. Extremely wide window width requires the computer to ignore ___ contrast differences in order to display the entire range of data.
abacus
fine
TV camera
scanning
28. What is the name for a binary digit?
bit
detector
low-pass filter
binary machine
29. Which type of information consists of operating instructions?
expansion or compression
read memory
program
high
30. Density and contrast of the digital image are controlled by varying the ____ ____ of each pixel.
CD or DVD
numerical values
1960s
0 - 1
31. Medical imaging is often achieved from information that has been processed by what?
RAM - ROM
binary machine
analog-to-digital converters
inverse
32. What are the two most common output devices?
monitors and printers
10 megabyte
1960s
scanning
33. Each pixel is capable of representing a wide range of what?
computer - radiographer
IRs
matrix
shades of gray
34. What does DICOM stand for?
inverse
32
mathematical theory - solid-state electronics - and microchip technology
digital imaging and communication in medicine
35. What are the two ways detectors acquire information?
slow scanning
scanning or array detection
32
analog-to-digital converters
36. Computers operate from ____ ____ language.
200 - 500-1000
low-pass - band-pass - and high-pass
reduces
binary machine
37. What type of scanning increases resolution slightly by scanning all 525 lines in order?
progressive scanning
fine
inversely
Input devices
38. What is an individual matrix box or picture element?
1-2 lp/mm
pixel
reduces
signal-to-noise ratio
39. What are the two ways detectors acquire information?
program
numerical values
2^x
scanning or array detection
40. What does DICOM stand for?
digital imaging and communication in medicine
inverse
high
monitors and printers
41. Noise is ____ related to contrast.
inversely
decrease
1000+
computer - radiographer
42. Fluoroscopic noise mostly comes from what?
1000+
high
electronic sources
array detection
43. What does a 0 in binary code stand for?
magnetic tape
direct
off
decreased
44. What changes the pixel value by addition or subtraction and controls image density?
hardware
frequency
window level
DICOM standard
45. What is the 'read-only' memory that contains basic operating instructions that are almost never changing?
ROM
Fourier Transformation
program
fine
46. Resolution is controlled by what?
matrix
ROM
matrix size
computer - radiographer
47. What changes the pixel value by addition or subtraction and controls image density?
decreased
window width
matrix
window level
48. What is the name for a binary digit?
write memory
bit
signal-to-noise ratio
band-pass filtering
49. What is the raw data to which a Fourier Transformation is applied to create the digital image?
large amount
2^x
frequency
transverse - sagittal - and coronal
50. 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?
expansion or compression
abacus
bus
TV camera