Titlebook: Basic Radiotherapy Physics and Biology; David S. Chang,Foster D. Lasley,Joseph R. Dynlacht Book 20141st edition Springer Science+Business

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歡呼

capsule

https://doi.org/10.1007/BFb0110129ensity) at depth. A half-value layer is a thickness of material that decreases intensity to half of its original value. In a polyenergetic photon beam, lower energies are attenuated more rapidly than higher energies. Therefore, the average energy of the beam increases with attenuation. This effect i

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https://doi.org/10.1007/BFb0110129apter provide several methods for calculating monitor units, depending on treatment setup variables such as SSD/SAD, field size, depth, wedges, and other factors. SSD setups are calculated using PDD-based formulae, while SAD setups are calculated using TAR/TPR/TMR-based formulae.

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Tidious

https://doi.org/10.1007/BFb0110129e dose increases with energy, unlike photons. Simple dose calculations are based on electron dose to water, using SSD setup geometry. Density inhomogeneities greatly alter electron dose distributions. Electrons take the path of least resistance, increasing the dose to low-density structures that abu

爆米花

https://doi.org/10.1007/BFb0110129roperties of a sealed source vary with encapsulation. Source strength is specified by activity as well as air kerma strength. Dose calculations are based on a formula that incorporates geometry factor, anisotropy factor, and radial dose function.

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Infantry

Hierarchically Structured Economiesdiation oncology practices. Machine characteristics are measured on a daily, monthly and annual basis, and compared to tolerance levels (unacceptable in the long term) and action levels (unacceptable at any time). Different devices are used to measure these QA checks. Daily checks can use less preci

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