Treatment of axial data in three-dimensional PET.
Treatment of axial data in three-dimensional PET.
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发表时间：
1987-11
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通讯作者：
M. Daube-Witherspoon;G. Muehllehner
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文献类型：
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作者：
M. Daube-Witherspoon;G. Muehllehner
提高正电子发射断层摄影（PET）扫描仪的轴向空间分辨率将导致灵敏度降低，除非符合的轴向接受角保持恒定。然而，大的接受角违反了大多数重建算法中的假设，这些算法重建平行的独立切片，而不是三维体积。提出了两种处理容积PET扫描仪轴向信息的方法。定性和定量的近似引入的误差进行检查模拟对象与尖锐的边界和一个更解剖现实的分布与平滑的活动梯度。
Improved axial spatial resolution in positron emission tomography (PET) scanners will lead to reduced sensitivity unless the axial acceptance angle for the coincidences is kept constant. A large acceptance angle, however, violates assumptions made in most reconstruction algorithms, which reconstruct parallel independent slices, rather than a three-dimensional volume. Two methods of treating the axial information from a volume PET scanner are presented. Qualitative and quantitative errors introduced by the approximations are examined for simulated objects with sharp boundaries and for a more anatomically realistic distribution with smooth activity gradients.