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DMSO Physics 2 > Ch 13 > Flashcards

Ch 13 Flashcards

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1
Q

Static Imaging

A

images displayed one frame at a time

“picture”

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2
Q

Real Time Imaging

A

each frame is created and displayed very quickly, providing the impression of constant motion

“movie”

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3
Q

Duplex Imaging

A

real time imaging and Doppler at same time

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4
Q

Frame rate

A

system’s ability to create numerous frames each second

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5
Q

Two things that determine frame rate

A

speed of sound in medium

depth

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6
Q

Units of frame rate

A

Hz

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7
Q

Temporal Resolution

A

ability to precisely position moving structures from instant to instant

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8
Q

Speed is a fundamental limition of what?

A

temporal resolution

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9
Q

4 factors that affect temporal resolution

A
  1. depth
  2. focus
  3. Sector Size
  4. Line Density
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10
Q

If shallower or fewer pulses

go return time
t frame
frame rate
temporal resolution

A

short go-return time
shorter t frame
higher frame rate
superior temporal resolution

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11
Q

If deeper or more pulses

go return time
t frame
frame rate
temporal resolution

A

long go-return time
longer t frame
lower frame rate
inferior temporal resolution

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12
Q

t frame

A

time for one frame to be created

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13
Q

t frame and frame rate relationship

A

inversely related

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14
Q

pulses x PRP =

A

t frame

Example:

100 x 1/1000 second = 1/10 second or 10 Hz

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15
Q

Factors Determining number of pulses per frame

A

number of focal points
sector size
line density

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16
Q

Imaging depth and frame rate are what related?

A

Inversely

17
Q

Pulse per frame and frame rate are what related?

A

inversely

18
Q

Single Focus

pulses per frame
t frame
frame rate
temporal resolution
lateral resolution
A 
one pulse per scan line
shorter t frame
higher frame rate
better temporal resolution
poorer lateral resolution
19
Q

Multi-focus

pulses per frame
t frame
frame rate
temporal resolution
lateral resolution
A 
many pulses per scan line
longer t frame
lower frame rate
dimished temporal resolution
improved lateral resolution
20
Q

Frame rate and time are what related?

A

inversely related

21
Q

t frame x frame rate =

A

1

Example:

1/10 of a second, frame rate = 10 frames/second or 10 Hz

22
Q

Narrow Sector

pulses per frame
t frame
frame rate
temporal resolution

A

fewer pulses per frame
shorter t frame
higher frame rate
superior temporal resolution

23
Q

Wide Sector

pulses per frame
t frame
frame rate
temporal resolution

A

more pulses per frame
longer t frame
lower frame rate
inferior temporal resolution

24
Q

how to change sector size?

A

field of view

25
Q

Triplex Imaging

A

Pulse Waves, Color Doppler and real time imaging

26
Q

Low Line Density

spaced line
pulses per frame
t frame
frame rate
temporal resolution
spatial resolution
A 
widely spaced line
fewer pulses per frame
shorter t frame (faster)
higher frame rate
high temporal resolution
poor spatial resolution
27
Q

High Line Density

spaced line
pulses per frame
t frame
frame rate
temporal resolution
spatial resolution
A 
tightly packed line
more pulses per frame
longer t frame
lower rate rate
lower temporal resolution
excellent spatial resolution
28
Q

What is line density?

A

alter the spacing between sound beams

29
Q

Better Temporal

Resolution
depth
focus
sector
density
frame rate
A 
shallow imaging
single focus
narrow sector
low line density
higher frame rate
30
Q

Worse Temporal

Resolution
depth
focus
sector
density
frame rate
A

deep imaging
multiple focal points (improves lateral resolution)
wide sector
high line density (improves spatial resolution)
lower frame rate

31
Q

Image vs movie quality

A

Some system settings produces an excellent photograph are inconsistent with producing an excellent movie. A low frame rate and poor temporal resolution create a great image but a poor movie

DMSO Physics 2 (26 decks)

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