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目前临床应用的全身扫描PET机一般采用环形探测器结构,投影线是完整且规则的正弦图(Sinogram,Sino)采用传统的扇形束构造法。随着基于局部扫描的平板PET机设计概念的出现,由于平板PET的投影线是不完整且不规则的,开发适合平板PET的平行束构造Sino图算法对平板PET机的发展至关重要。本文根据由我们实验室设计开发的平板乳腺PET机的物理结构,以及基于旋转采集模式,提出了应用于乳腺平板PET的平行束算法。为验证算法的正确性,开展了动物实验,实验采用旋转3次,每次旋转45°的采集模式,构造出Sino图,然后利用该Sino图进行图像重建。图像重建的结果表明,本文提出的算法是正确可行的,为平板PET中Sino图的构造提供了新的思路。
The current clinical application of general-purpose scanning PET machine ring detector structure is generally used, the projection line is a complete and regular sinogram (Sinogram, Sino) using the traditional fan beam construction method. With the advent of the design concept of flat-panel PET machine based on partial scan, the development of the parallel-beam structured Sino graph algorithm which is suitable for flat PET is very important to the development of flat-panel PET machine because of the incomplete and irregular projection line of flat-panel PET. Based on the physical structure of the flat breast PET machine designed and developed by our laboratory and based on the rotation collection mode, this paper proposes a parallel beam algorithm which is applied to breast plate PET. In order to verify the correctness of the algorithm, animal experiments were carried out. The experiments were carried out by using a collection mode rotated 3 times and rotated 45 ° each time to construct a Sino map, and then use this Sino map to reconstruct the image. The result of image reconstruction shows that the algorithm proposed in this paper is correct and feasible, which provides a new idea for the construction of Sino graph in flat PET.