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本文从模体观测法和调制传递函数法两个方面总结了显微CT三维空间分辨率的测试方法,重点介绍模体的形式结构和分辨率计算方法.三维分辨率模体通常分为条纹或圆孔模体,能够比较直观地估计分辨率的大概范围,但是受观测者的主观影响较大,且用于三维成像的显微CT的条纹模体成本较高.调制传递函数法模体加工相对简单,可以较客观全面地探究分辨率的空间变化规律,可分为点扩散函数法、线扩散函数法、边缘扩散函数法.本文讨论和比较各种分辨率测试方法的优缺点,然后提出一个新型的分辨率测试模体设计方案,并且通过一个简化模体验证了该方案的可行性.
This paper summarizes the test methods of three-dimensional spatial resolution of microscopic CT from the aspects of phantom observation and modulation transfer function, focusing on the formal structure of the phantom and the resolution calculation method.The three-dimensional resolution motif is usually divided into stripes or The circular cavity mold can estimate the approximate range of the resolution more intuitively, but it is subjectively influenced by the observer, and the cost of the streak mold of the micro CT for three-dimensional imaging is higher. Modulation Transfer Function Relatively simple, you can objectively and comprehensively explore the spatial resolution of the resolution can be divided into point spread function method, line spread function method, edge diffusion function method.This paper discusses and compares the advantages and disadvantages of various resolution test methods, and then proposed A new type of resolution test phantom is designed and the feasibility of the solution is verified by a simplified phantom.