We proposed a concept of whole gamma imaging (WGI) that utilizes all detectable gamma rays for imaging. An additional detector ring, which is used as the scatterer, is inserted in the field-of-view of a PET ring so that single gamma rays can be detected by the Compton imaging method. In particular, for the non-pure positron emitters which emit an additional gamma ray almost at the same time, triple gamma imaging will be enabled; localization on each line-of-response (LOR) is possible by using the Compton cone of the additional gamma ray. We developed a prototype to show a proof of the WGI concept. The diameters of scatterer ring and PET ring were set as 20 cm and 66 cm, respectively. For Compton imaging of the 662-keV gamma ray from a 137 Cs point source, spatial resolution obtained by the list-mode OSEM algorithm was 4.4 mm FWHM at the 8 cm off-center position and 13.1 mm FWHM at the center position. For PET imaging of a 22 Na point source, spatial resolutio...

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全伽马成像：PET与康普顿成像相结合的新概念

我们提出了一种利用所有可检测的伽玛射线进行成像的全伽马成像（WGI）的概念。在PET环的视场中插入了一个用作散射体的附加检测器环，以便可以通过康普顿成像方法检测到单个伽马射线。特别是，对于几乎同时发射附加伽马射线的非纯正电子发射器，将启用三重伽马成像；通过使用附加伽马射线的康普顿锥，可以在每个响应线（LOR）上进行定位。我们开发了一个原型来展示WGI概念的证明。散射环和PET环的直径分别设置为20 cm和66 cm。对于来自137 Cs点源的662keVγ射线的康普顿成像，通过列表模式OSEM算法获得的空间分辨率为4。偏心位置8厘米处的FWHM为4毫米，中间位置为13.1毫米FWHM。对于22 Na点源的PET成像，空间分辨率...