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Physics > Real Time Imaging (Temporal Resolution) > Flashcards

Real Time Imaging (Temporal Resolution) Flashcards

1
Q

What is the definition of Frame Rate?

A

The system’s ability to create numerous frames each second (Hz); directly related to Temporal Resolution and the system’s PRE, inversely related to Tframe.

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2
Q

What does Temporal Resolution describe?

A

The ability to precisely position moving structures from instant to instant.

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3
Q

What is Tframe?

A

Time it takes the system to create 1 frame.

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4
Q

What factors affect Frame Rate?

A
  • Speed of Sound in the Medium
  • Sector size
  • Short go-return time
  • Line density
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5
Q

What is the relationship between Frame Rate and Temporal Resolution?

A

Higher frame rate leads to better Temporal Resolution.

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6
Q

What is the formula for PRF?

A

PRF = # scan lines x frame rate.

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7
Q

What results in Superior Temporal Resolution?

A

Higher frequency transducer and shorter Tframe.

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8
Q

What is the effect of Multi-Focus on Temporal Resolution?

A

Lower frame rate and diminished Temporal resolution.

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9
Q

Fill in the blank: In M-mode, the term for frame rate is _______.

A

very high and equal to the system’s PRE.

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10
Q

What is the impact of Imaging Depth on Frame Rate?

A

Deep Imaging results in longer Tframe and lower frame rate.

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11
Q

What is the advantage of Multi-Focus imaging?

A

Improved Lateral resolution.

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12
Q

True or False: A higher number of focal points results in a higher frame rate.

A

False.

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13
Q

What is the effect of a lower frequency transducer on Temporal Resolution?

A

Inferior Temporal Resolution.

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14
Q

Fill in the blank: The spacing between sound beams is referred to as _______.

A

line density.

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15
Q

Define Shallow Imaging in terms of Frame Rate.

A

Shorter Tframe and higher frame rate.

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16
Q

What happens to Temporal Resolution with poorer Lateral resolution?

A

Better Temporal resolution.

17
Q

What is the relationship between the number of Pulses per frame and Frame Rate?

A

Inversely related to both.

18
Q

What is a characteristic of a narrow sector in ultrasound imaging?

A

Fewer pulses per frame

This results in a higher frame rate and superior temporal resolution.

19
Q

How does a narrow sector affect Tframe?

A

Shorter Tframe

This contributes to a higher frame rate.

20
Q

What is the temporal resolution like in a narrow sector?

A

Superior temporal resolution

This is due to the higher frame rate.

21
Q

What is the line density in a narrow sector?

A

Low line density

This means widely spaced lines.

22
Q

What is the spatial resolution like in a narrow sector?

A

Poor spatial resolution

This is a trade-off for better temporal resolution.

23
Q

What imaging characteristics does a narrow sector provide?

A

Shallower imaging (high frequency), single focus, narrow sector size

These factors contribute to its specific imaging capabilities.

24
Q

What is a characteristic of a wide sector in ultrasound imaging?

A

More pulses per frame

This results in a lower frame rate and inferior temporal resolution.

25
Q

How does a wide sector affect Tframe?

A

Longer Tframe

This contributes to the lower frame rate.

26
Q

What is the temporal resolution like in a wide sector?

A

Inferior temporal resolution

This is due to the lower frame rate.

27
Q

What is the line density in a wide sector?

A

High line density

This means tightly packed lines.

28
Q

What is the spatial resolution like in a wide sector?

A

Excellent spatial (detail) resolution

This is the main advantage of a wide sector.

29
Q

What is the temporal resolution like in a wide sector?

A

Worse temporal resolution

This is due to the lower frame rate.

30
Q

What imaging characteristics does a wide sector provide?

A

Deeper imaging (low frequency), multiple foci, wide sector size

These factors improve lateral resolution.

Physics (24 decks)

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