positron-emitting 中文意思是什麼
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In some kinds of beta decay, a nuclide loses surplus positive charge by emitting a positron ( in the same event, a proton becomes a neutron, and neutrinos are also given off )
以某種貝它衰減，一個核素靠發出一個正電子失去剩餘正電荷（在相同的事件中，一個質子變成一個中子，而且也發射微中子） 。 -
The major difference between the two is that instead of a positron - emitting substance, spect uses a radioactive tracer that emits high - energy photons
這兩種技術最大的區別在於，單光子發射計算機化成像不用發射正電子的物質，而是用一個能發出高能量光子的有放射性的跟蹤劑。 -
The basic idea of positron imaging is injected chemical compounds labeled with positron - emitting nuclides into a body, then the distribution of the nuclides from the annihilation of positron and electron can be measured
可見，正電子成像系統的相關研究可由兩部分組成：成像裝置的研究、圖像重建的研究。本論文正是針對這兩個方面。
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