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SPI > RANGE EQUATION > Flashcards

RANGE EQUATION Flashcards

1
Q

How is time of flight related to depth?

A

directly

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2
Q

Do greater pulse distances prolong or shorten time of flight?

A

prolong

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3
Q

Do smaller or larger pulse distances shorten time of flight?

A

smaller

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4
Q

What is the average speed of sound in soft tissue?

A

1.54mm/μs

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5
Q

How is time of flight and distance of a pulse travels related?

A

directly related

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6
Q

How is the depth of a reflector calculated?

A

1.54 x go- return-time ÷ 2

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7
Q

What is the 13 μs rule?

A

For every 13 μs of go return time, the reflector depth is 1 cm deeper in soft tissue.

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8
Q

If it takes 39 μs for the time of flight, what is the reflector depth?

A

3 cm

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9
Q

If it takes 13 μs for the time of flight what is the reflector depth?

A

1 cm

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10
Q

If it takes 26 μs for the time of flight what is the reflector depth?

A

2 cm

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11
Q

What is the total distance traveled of a reflector depth of 3 cm?

A

6cm

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12
Q

True or false, the total distance that a pulse travels is three times the reflector depth?

A

False, it is twice the reflector depth.

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13
Q

What is the total distance traveled of a reflector depth of 4 cm?

A

8 cm

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14
Q

How is the pulse repetition period related to the maximum imaging depth?

A

Directly related

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15
Q

How is the PRP calculated?

A

Imaging depth (cm) X 13 μs

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16
Q

When the depth of view is shallow is the PRP short or long?

A

short

17
Q

When the depth of view is deep is the PRP short or long?

A

long

18
Q

What is the PRP when the depth of view is 12 cm?

A

156 μs

19
Q

How is PRF related to imaging depth?

A

inversely related

20
Q

Is the PRF high or low when the depth of view is shallow?

A

high

21
Q

Is the PRF high or low when the depth of view is deep?

A

low

22
Q

What is the equation for PRF in soft tissue?

A

77,000 cm/ s ÷ imaging depth

SPI (10 decks)

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