Unit 3: Radiographic technique Section 3: Focal Spots and filtration

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Section 3: Focal Spots and filtration

9 Terms

1
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What is a large focal spot used for

Larger or denser body parts requiring higher mA

2
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What is a small focal spot used for

Imaging requiring greater detail

3
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Why can’t a small focal spot use high mA

it has limited heat capacity

4
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What does filtration do

Hardens the x-ray beam

5
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What is the total filtration listed in the slides

2.5mm aluminum equivalent

6
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What is inherent filtration?

filtration provided by the x-ray tube envelope

7
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What is added filtration

additional material placed In the beam to filter it

8
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What is the half-value layer (HVL)

The material thickness needed to reduce x-ray beam intensity by half

9
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What are the two compensating filters?

Wedge and trough filters