Revisit of the Ramp Filter.
An important part of the filtered backprojection (FBP) algorithm is the ramp filter. This paper derives the discrete version of the ramp filter in the Fourier domain and studies the windowing effects. When a window function is used to control the noise, the image amplitude will be affected and reduced. A simple remedy is proposed to improve the image accuracy when a window function must be used.
Department of Electrical Engineering, Weber State University, Ogden, UT 84408 USA and the Department of Radiology, University of Utah, Salt Lake City, UT 84108 USA.
Gengsheng L
GL
Zeng
Filtered backprojection algorithm; analytic image reconstruction