Effect of finite exposure slits in determination of the line spread function and modulation transfer function.

T Villafana
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引用次数: 2

Abstract

The modulation transfer function of radiologic imaging systems is commonly obtained by determining the line spread function (LSF) of the system and computing its Fourier transform. Ideally, LSF should be obtained with infinitesimally narrow slits. The use of finite slits for obtaining the LSF is analyzed theoretically. An expression for the MTF of a finite rectangular slit is derived. Slit width correction of observed MTF is discussed as well as the correction for any generalized slit configuration.

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有限曝光缝对确定线扩展函数和调制传递函数的影响。
放射成像系统的调制传递函数通常是通过确定系统的线扩展函数(LSF)并计算其傅里叶变换来获得的。理想情况下,LSF应该具有无限小的狭缝。本文从理论上分析了用有限狭缝法获得LSF的方法。导出了有限矩形狭缝的MTF表达式。讨论了观测到的MTF的狭缝宽度校正以及任何广义狭缝构型的校正。
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