A point spread function（PSF） for the blurring component in positron emission tomography（PET） is studied. The PSF matrix is derived from the single photon incidence response function. A statistical iterative recons...A point spread function（PSF） for the blurring component in positron emission tomography（PET） is studied. The PSF matrix is derived from the single photon incidence response function. A statistical iterative reconstruction（IR） method based on the system matrix containing the PSF is developed. More specifically, the gamma photon incidence upon a crystal array is simulated by Monte Carlo（MC） simulation, and then the single photon incidence response functions are calculated. Subsequently, the single photon incidence response functions are used to compute the coincidence blurring factor according to the physical process of PET coincidence detection. Through weighting the ordinary system matrix response by the coincidence blurring factors, the IR system matrix containing the PSF is finally established. By using this system matrix, the image is reconstructed by an ordered subset expectation maximization（OSEM） algorithm. The experimental results show that the proposed system matrix can substantially improve the image radial resolution, contrast,and noise property. Furthermore, the simulated single gamma-ray incidence response function depends only on the crystal configuration, so the method could be extended to any PET scanner with the same detector crystal configuration.展开更多
目的 通过临床验证获得临床影像质量可接受率、设备常用功能、机器使用便捷性、整机稳定性满意度与安全性评价,对Insight NM/CT Pro SPECT/CT成像系统临床应用中的安全性与有效性进行验证。资料与方法 前瞻性选取内蒙古医科大学附属医院...目的 通过临床验证获得临床影像质量可接受率、设备常用功能、机器使用便捷性、整机稳定性满意度与安全性评价,对Insight NM/CT Pro SPECT/CT成像系统临床应用中的安全性与有效性进行验证。资料与方法 前瞻性选取内蒙古医科大学附属医院2022年7—10月自愿参与试验的受试者79例,使用Insight NM/CT Pro SPECT/CT分别进行内分泌、循环、骨骼、呼吸、泌尿多系统显像,对图像质量进行有效性评价,并评价机器运行情况与安全性。结果 79例患者影像质量评价:平面显像36例中可接受者35例;断层显像43例中可接受者42例,可接受率分别为97.22%、97.67%,95%CI下限分别为85.47%、87.71%,均高于目标值(83.00%)。操作人员对79例患者进行显像操作时,设备常用功能、设备使用便捷性、整机稳定性评价均满意,满意率为100%,未发生不良事件。结论 Insight NM/CT Pro SPECT/CT有效性可满足临床应用要求,图像组织结构显示清楚,设备常用功能齐备,系统稳定,安全性较高。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.Y4811H805C and 81101175)
文摘A point spread function（PSF） for the blurring component in positron emission tomography（PET） is studied. The PSF matrix is derived from the single photon incidence response function. A statistical iterative reconstruction（IR） method based on the system matrix containing the PSF is developed. More specifically, the gamma photon incidence upon a crystal array is simulated by Monte Carlo（MC） simulation, and then the single photon incidence response functions are calculated. Subsequently, the single photon incidence response functions are used to compute the coincidence blurring factor according to the physical process of PET coincidence detection. Through weighting the ordinary system matrix response by the coincidence blurring factors, the IR system matrix containing the PSF is finally established. By using this system matrix, the image is reconstructed by an ordered subset expectation maximization（OSEM） algorithm. The experimental results show that the proposed system matrix can substantially improve the image radial resolution, contrast,and noise property. Furthermore, the simulated single gamma-ray incidence response function depends only on the crystal configuration, so the method could be extended to any PET scanner with the same detector crystal configuration.
文摘目的 通过临床验证获得临床影像质量可接受率、设备常用功能、机器使用便捷性、整机稳定性满意度与安全性评价,对Insight NM/CT Pro SPECT/CT成像系统临床应用中的安全性与有效性进行验证。资料与方法 前瞻性选取内蒙古医科大学附属医院2022年7—10月自愿参与试验的受试者79例,使用Insight NM/CT Pro SPECT/CT分别进行内分泌、循环、骨骼、呼吸、泌尿多系统显像,对图像质量进行有效性评价,并评价机器运行情况与安全性。结果 79例患者影像质量评价:平面显像36例中可接受者35例;断层显像43例中可接受者42例,可接受率分别为97.22%、97.67%,95%CI下限分别为85.47%、87.71%,均高于目标值(83.00%)。操作人员对79例患者进行显像操作时,设备常用功能、设备使用便捷性、整机稳定性评价均满意,满意率为100%,未发生不良事件。结论 Insight NM/CT Pro SPECT/CT有效性可满足临床应用要求,图像组织结构显示清楚,设备常用功能齐备,系统稳定,安全性较高。
