论文标题
通过移动扫描中心消除L-spect的中央伪像用模块化的部分环探测器
Elimination of Central Artefacts of L-SPECT with Modular Partial Ring Detectors by Shifting Center of Scanning
论文作者
论文摘要
灯场单光子发射计算机断层扫描（L-SPECT）系统的开发是为了克服常规SPECT中的某些缺点，通过应用元素成像的概念。与具有常规准直仪的SPECT系统相比，该系统在减少信息损失和扫描时间方面表现出改善的性能。 SEPT系统通过用微范围的多针孔阵列代替传统的准直仪来转换为L光谱系统。 L-Spect系统的视野（FOV）通过通过平铺小探测器模块将检测器头重塑为环型来增强。具有模块化部分环探测器（MPRD L-Spect）的L光谱系统在体积重建过程中表现出圆柱形伪像。因此，这里的工作重点是通过更改扫描轨道来重建所检查对象的圆柱形伪像。进行增强，以使L-Spect系统的扫描中心具有MPRD L-Spect的扫描中心，以不同的值移动。 MPRD L-SPECT的重建质量在有或没有中心转移的情况下，根据最大（FWHM）和调制传递函数（MTF）的全宽度评估。此外，还检查了视觉比较。结果表明，MPRD L-Spect的中心转移通过改进的FWHM来克服了中央伪像的问题。通过增加MPRD的扫描中心偏移距离，可以进一步改善空间分辨率。
The Lightfield Single Photon Emission Computed Tomography (L-SPECT) system is developed to overcome some of the drawbacks in conventional SPECT by applying the idea of plenoptic imaging. This system displayed improved performance in terms of reduced information loss and scanning time when compared to the SPECT system which has a conventional collimator. The SPECT system is transformed into L-SPECT system by replacing the conventional collimators with micro-range multi-pinhole arrays. The field of view (FOV) of the L-SPECT system is enhanced by reshaping the detector head into ring-type by tiling small detector modules. The L-SPECT system with modular partial ring detectors (MPRD L-SPECT) exhibits cylindrical artefacts during volumetric reconstruction. Hence, here the work is focused to remove the cylindrical artefacts in the reconstruction of the examined objects by changing the scanning orbit. The enhancement is done such that the center of scanning of the L-SPECT system with MPRD L-SPECT is shifted at different values. The reconstruction quality of MPRD L-SPECT with and without center shifting is evaluated in terms of the Full Width at Half Maximum (FWHM) and Modulation Transfer Function (MTF). Moreover, the visual comparison is also examined. The results indicate that center shifting of MPRD L-SPECT overcomes the problem of the central artefact with improved FWHM. By increasing MPRD's scanning center shift gap, the spatial resolution can be further improved.
