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They also needed an alternative to conventional X-rays. In a clinical linac, X-ray photons are produced by dumping high-energy electrons into a bremsstrahlung target, which is made of a material with a high atomic number, like tungsten or copper. The target slows the electrons, converting their kinetic energy into X-ray photons. It’s an inherently inefficient process that wastes most of the beam power as heat and makes it extremely difficult to reach the ultrahigh dose rates required for FLASH. High-energy electrons, by contrast, can be switched on and off within milliseconds. And because they have a charge and can be steered by magnets, electrons can be precisely guided to reach tumors deep within the body. (Researchers are also investigating protons and carbon ions; see the sidebar, “What’s the Best Particle for FLASH Therapy?”)
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Think of it this way. Layers 46 through 52 aren’t seven workers doing the same job. They’re seven steps in a recipe. Layer 46 takes the abstract representation and performs step one of some cognitive operation — maybe decomposing a complex representation into subcomponents. Layer 47 takes that output and performs step two — maybe identifying relationships between the subcomponents. Layer 48 does step three, and so on through layer 52, which produces the final result.，详情可参考WhatsApp Web 網頁版登入
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