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热词
    • 2. 发明授权
    • Method of and apparatus for improving gamma camera image
    • 改善伽马相机图像的方法和装置
    • US5530248A
    • 1996-06-25
    • US453526
    • 1995-05-30
    • Alex NatanzonGideon BerladDov MaorYigal ShremAdrian Soil
    • Alex NatanzonGideon BerladDov MaorYigal ShremAdrian Soil
    • G01T1/164G06F17/00G01T1/161
    • G01T1/1647G01T1/1642G01T1/1648
    • A system for recording fewer of the events that are caused by unwanted photons with greater stability. The system locally determines the energy spectrum and fits for each pixel of the image the determined energy spectrum with a modified trial function composed of: a photopeak component of known energy shape, Compton scatter components having theoretically derived energy shapes and, when applicable, also measured or calculated energy spectra of other unwanted photons. The modified trial function also takes into consideration unknown local deviations in the outputs of electronic components. The amplitude of the photopeak distribution resulting from the fit is used to obtain the local content of wanted interactions in the image. This enables removal of Compton contamination and also the contamination caused by interaction of the gamma photons with lead components.
    • 用于记录较少稳定性的由不需要的光子引起的事件的系统。 该系统局部地确定能量谱并且利用经修改的试验函数对图像的每个像素进行拟合,该修改的试验函数由以下组成:具有已知能量形状的光峰分量,具有理论上衍生的能量形状的康普顿散射分量,并且在适用时也被测量 或计算其他不需要的光子的能谱。 修改的试验功能还考虑了电子部件输出中的未知局部偏差。 由拟合得到的光峰分布的幅度用于获得图像中所需相互作用的局部内容。 这样可以消除康普顿污染物以及伽马光子与铅成分的相互作用引起的污染。