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首页> 外文会议>IEEE Nuclear Science Symposium >Simultaneous 3D correction for attenuation, scatter, and detector response in SPECT
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Simultaneous 3D correction for attenuation, scatter, and detector response in SPECT

机译：同时进行SPECT衰减，散射和检测器响应的3D校正

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Among all the factors that contribute to the degradation of image quality, three physical phenomena have a major impact: photonic attenuation, Compton scatter, and detector point response. The correction of each of these factors have been intensively studied [1, 2, 3]. It is generally considered that using algebraic methods is the best way to correct for physical effects [4]. The drawback of these methods is the intensive computational time and the large amount of memory they require. That is the reason why only few methods have been proposed to correct simultaneously for attenuation, scatter, and detector response [5]. This paper presents a new algebraic method to correct for the three physical effects previously mentioned. The method is based on a simultaneous acquisition of transmission and emission projection data. The reconstructed attenuation map is then used to estimate the 3D distribution of scattered photons [6], but the map is also incorporated in the projector/backprojector used to correct for 3D detector response [7]. The key point of the algorithm is the use of a 3D set of line integrals [8], calculated as a part of the attenuation technique, as the basis of a model of the 3D distribution of scattered events, but also for the estimation of the 3D geometric response of the detector. The triple correction method has been tested on phantom data, acquired with a two detector camera equipped with parallel collimators. The results show that best results are obtained using the three corrections simultaneously, compared to results obtained with only one, or two, of the three corrections.
机译：在有助于降低图像质量的因素中，三种物理现象具有重大影响：光子衰减，康普顿散射和检测点响应。每个因素的校正都已经深入研究[1,2,3]。通常认为，使用代数方法是纠正物理效果的最佳方法[4]。这些方法的缺点是密集的计算时间和它们所需的大量内存。这就是为什么只提出少量方法以同时纠正衰减，散射和检测器响应[5]的原因。本文提出了一种纠正前面提到的三种物理效应的新代数方法。该方法基于同时获取传输和发射投影数据。然后用于估计重建的衰减图来估计散射光子的3D分布[6]，但是地图也结合在用于校正3D检测器响应的投影仪/后喷射器中[7]。算法的关键点是使用3D一组线路积分[8]，作为衰减技术的一部分计算，作为散射事件的3D分布的模型的基础，而是为了估计3D探测器的几何响应。三重校正方法已经在幻像数据上进行了测试，用配备有并联准直器的两个检测器相机获取。结果表明，与三个校正的只有一，或两个的结果相比，使用三个校正来获得最佳结果。

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