Compressive effect of the magnetic field on the positron range in commonly used positron emitters simulated using Geant4
Compressive effect of the magnetic field on the positron range in commonly used positron emitters simulated using Geant4
复制标题
使用 Geant4 模拟的常用正电子发射器中磁场对正电子射程的压缩效应
DOI：
10.1140/epjp/i2017-11779-x
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发表时间：
2017
影响因子：
3.4
通讯作者：
Wei Long
中科院分区：
文献类型：
--
作者：
Li Chong;Cao Xingzhong;Liu Fuyan;Tang Haohui;Zhang Zhiming;Wang Baoyi;Wei Long
利用Geant 4工具包，以H2O为环境材料，模拟了磁场对PET（Positron Emission Tomography）中常用正电子发射体的正电子射程的压缩效应。正电子射程的压缩在平行和垂直于磁场的方向上是不同的，表明相对变化率对磁场的最终变化是有限的。这种变化在很大程度上取决于同一介质中正电子发射能谱。当磁场强度在3- 6 T范围内时，正电子湮没点的体积被显著压缩。这对于通常用作PET技术中正电子源的82 Rb来说更为突出。
The compressive effect of a magnetic field on the positron range from commonly used positron emitters in PET (Positron Emission Tomography) was simulated using the Geant4 toolkit with H2O as the environmental material. The compression of the positron range, which was different in the directions parallel and perpendicular to the magnetic field, showed finite final variation of relative change rateversusthe magnetic field. The variation greatly depended on the positron-emission energy spectrum in the same medium. Furthermore, the volume of the positron annihilation point was dramatically compressed as the magnetic field was set in the range of 3-6T. It was more prominent for82Rb , which is generally used as a positron source in PET technology.