15% rule-KVP-Pt Dose-Technique rules Flashcards

1
Q

What is the 15% rule?

A

Increasing kVp by 15% increases the receptor exposure by 100% (2x)

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2
Q

What is the relationship between kVp and exposure?

A

Exponential

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3
Q

How much does a 15% increase in kVp increase patient dose?

A

By 25-40%

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4
Q

If you need to cur dose in half how should kVP be adjusted?

A

Decrease kVp by 15%

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5
Q

How do the 4cm rule and 15% rule coincide?

A

For every 4 cm change in thickness you need to increase exposure by 2X, which can be achieved by increasing KVP 15%

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6
Q

Which technical factor should be increased to save patient dose?

A

kVp

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7
Q

Which interaction yields most of the patient dose?

A

Photoelectic interaction

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8
Q

How does doubling mAs affect dose?

A

Dose will also be doubled

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9
Q

What is the minimum kVP?

A

lowest kVp that still provides some degree of penetration through all tissues of interest

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10
Q

What amount of mAs can account for a low kVp?

A

No amount of mAs can account for lower kVp

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