别名
发表于 2025-3-26 22:23:44
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欢呼
发表于 2025-3-27 02:01:18
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capsule
发表于 2025-3-27 08:51:34
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
Employee
发表于 2025-3-27 12:34:51
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.
gerontocracy
发表于 2025-3-27 16:48:53
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Tidious
发表于 2025-3-27 18:46:28
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
发表于 2025-3-28 00:35:36
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.
CAMEO
发表于 2025-3-28 03:20:49
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Infantry
发表于 2025-3-28 07:35:55
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
愤慨一下
发表于 2025-3-28 11:03:07
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