11CO2'/> New Imaging Method of Positrons Leaving the Source Application for PET/MR hybrid Scanners -
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New Imaging Method of Positrons Leaving the Source Application for PET/MR hybrid Scanners -

机译：新成像方法的正极源，留给宠物/先生扫描仪的源应用 -

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The 11CO2 tracer is of high interest to study carbon transport in living plants. However, conventional PET images of plant leaves suffer from the poor positron annihilation probability in the targeted structures, thus giving strong bias in reconstructed images. Here, PET/MR hybrid scanner systems offer a new method to detect and quantify escaping positrons as 2D projections by exploiting the directed travelling of positrons parallel to the present B0 field of the MR magnet system. Due to the Lorentz force all emitted positrons propagate on spiral trajectories parallel to the B0 field with tiny gyroradii. The introduction of a thin absorber screen within the field-of-view of the PET scanner, forces the annihilation of almost all incoming positrons inside the absorber. The annihilation photon pairs can be registered as coincidences and thus directly indicate the positron impact point on the screen by interpolating the Lines-of-Response onto the screen. In this way, 2D images are obtained and the amount of positrons leaving the source can be quantified dynamically.
机译：这 11 CO. 2 追踪者对生物植物中的碳运输具有很高的兴趣。然而，植物叶片的常规PET图像遭受靶向结构中的较差的正电子湮灭概率，从而在重建的图像中产生强烈的偏置。这里，PET / MR混合扫描仪系统通过利用与当前B平行的定向行进来检测和量化作为2D投影的新方法。 0 MR磁铁系统的领域。由于洛伦兹力，所有发射的正弦在平行于B的螺旋轨迹上传播 0 与微小的gyroradii的领域。在PET扫描仪的视野中引入薄吸收器屏幕，迫使在吸收器内部的几乎所有进入的整个上压力湮灭。湮灭光子对可以注册为一致，因此通过在屏幕上插入响应线来直接指示屏幕上的正电子撞击点。以这种方式，获得2D图像，并且可以动态地量化离开源的正数量。

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