Villafana T
Acta Radiol Ther Phys Biol. 1977 Jun;16(3):281-8. doi: 10.3109/02841867709133948.
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.
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应该用无限窄的狭缝来获得。从理论上分析了使用有限狭缝来获得LSF的情况。推导了有限矩形狭缝的MTF表达式。讨论了对观测到的MTF的狭缝宽度校正以及对任何广义狭缝配置的校正。
