摘要
目的:研究SPECT显像中不同采集矩阵与函数后重建对图像质量影响。方法:分析不同采集矩阵在空气介质中的系统分辨率。系统分析22种不同函数后重建对平面显像图像的影响。通过Jaszezak模型研究不同采集矩阵与函数重建下的图像质量,Metz、Butterworth、Generalized Hanning、有序最大期望值法(OSEM)函数重建后,再加做Chang′s AC与不加做Chang′s AC对脑断层图像的影响。结果:在平面与断层显像中,高矩阵采集图像可以通过后重建转换为与低矩阵图像相同的效果,而低矩阵图像却不能通过后重建转换与高矩阵图像相同的效果。不同矩阵采集时间差异不明显。高矩阵采集图像经过设当函数重建后所获影像结果最优。结论:使用高矩阵采集条件获得高空间分辨率影像,选用合适的重建函数,获得种类更多的图像效果,效果更佳的影像质量,有助于帮助临床诊断。
Purpose： Quality of image resolution had been chasing the focus of the public.Enhancement of acquisition conditions was closely related to the development of instruments.However,in the context of strained health care resources,there were many restrictions on continually updating medical equipment.This paper studied the impact of the conditions change in the SPECT acquisition process and function reconstruction on image quality.Methods：The image quality under different function reconstruction and matrix sizes was studied on the Jaszezak phantom.We analyzed the effects of different function reconstruction in thyroid planar imaging and the impacts of the pre-reconstruction of Metz,Butterworth,Generalized Hanning,OSEM function with and without Chang＇s method of attenuation correction（AC） type of brain SPECT images.Results：High-matrix images could get the same effect with low-matrix images through the reconstruction conversion,but in turn,could not.Duration of acquisition was no difference in different acquisition matrix.Conclusion： In a static collection process,the use of high matrix sizes can get high spatial resolution images.Choosing the appropriate reconstruction function,we can get access to wider variety and better effectiveness of images.
出处
《中国医学计算机成像杂志》
CSCD
北大核心
2011年第2期164-167,共4页
Chinese Computed Medical Imaging
关键词
体层摄影术
发射型计算机
单光子
分辨率
质量控制
滤波函数
矩阵
Tomography
emission-computed
single-photon
Resolution
Quality control
Filter function
Matrix sizes
