A novel SPECT model with an elliptical orbit and multiple detectors is proposed for detecting the metabolism of the human heart. Under the structure of the proposed model, the distance between the detector and the patient becomes smaller, which can effectively improve the SNR. The slit-slat collimator is used to collimate the emitted photons. Modified iterative reconstruction algorithm is proposed to reconstruct a small centre field with severe truncation data under the constraints of body contour and total variation (TV). Simulations for the proposed SPECT are implemented to access the image reconstruction quality. The simulation results show that proposed imaging system with appropriate reconstruction methods can provide significant improvements in the spatial resolution and the image quality. The geometric efficiency of the proposed SPECT is about twice that of the conventional SPECT system, but the scanning time is only about one tenth.

提出了一种具有椭圆轨道和多个检测器的新型SPECT模型，用于检测人心脏的新陈代谢。在提出的模型的结构下，探测器与患者之间的距离变小，可以有效提高信噪比。狭缝平板准直仪用于准直发射的光子。提出了一种改进的迭代重建算法，在身体轮廓和总变化量（TV）的约束下，利用严格的截断数据重建一个小的中心场。对所提出的SPECT进行仿真以获取图像重建质量。仿真结果表明，所提出的具有适当重构方法的成像系统可以在空间分辨率和图像质量上提供显着的改善。