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Uniformity index

80% dose point

How is electron energy determined?

From measurements of the practical range in a water phantom

What is the measure of photon beam uniformity?

<p>Transverse beam profiles</p> Signup and view all the answers

What is the definition of flattened area of the beam?

<p>The area of the beam defined by straight lines joining points on the major axes and diagonals of the square fields</p> Signup and view all the answers

What is the measure of electron beam uniformity?

<p>Transverse beam profiles</p> Signup and view all the answers

What is the specified depth for measuring beam uniformity?

<p>Depth of maximum dose</p> Signup and view all the answers

What is the definition of electron penumbra?

<p>The distance between the 80% and 20% dose points along a major axis at a given depth</p> Signup and view all the answers

What is the relationship between electron beam bremsstrahlung contamination and electron energy?

<p>As electron energy increases, bremsstrahlung contamination increases</p> Signup and view all the answers

What is the unit of measure for X-ray beam energy specified in terms of central axis PDD?

<p>Percent</p> Signup and view all the answers

Study Notes

1. X-ray beam energy is specified in terms of central axis PDD.
2. Photon beam uniformity is specified in terms of transverse beam profiles or uniformity index.
3. Beam uniformity is measured at the depth of maximum dose to prevent off-axis peaking.
4. Uniformity index is a measure of beam uniformity over the entire area of the beam.
5. Flattened area of the beam is defined by straight lines joining points on the major axes and diagonals of the square fields.
6. Photon penumbra is defined as the distance between the 80% and 20% dose points on a transverse beam profile.
7. Electron energy is determined from measurements of the practical range in a water phantom.
8. Electron beam bremsstrahlung contamination increases with electron energy.
9. Electron beam uniformity is specified in terms of transverse beam profiles or uniformity index.
10. Electron penumbra is defined as the distance between the 80% and 20% dose points along a major axis at a given depth.

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Description

Test your knowledge on radiation therapy beam characteristics and measurements with this quiz! From X-ray energy to photon and electron beam uniformity and penumbra, this quiz covers it all. See how well you know the definitions and specifications for these important factors in radiation therapy. Keywords: radiation therapy, X-ray, photon beam, electron beam, uniformity, penumbra, bremsstrahlung.

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