Title :
Revisit of the Ramp Filter
Author_Institution :
Dept. of Electr. Eng., Weber State Univ., Ogden, UT, USA
Abstract :
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.
Keywords :
Fourier analysis; image denoising; image filtering; image reconstruction; Fourier domain; filtered backprojection algorithm; image accuracy; noise control; ramp filter; window function; windowing effects; Arrays; Convolution; Discrete Fourier transforms; Image reconstruction; Kernel; Noise; Transfer functions; Analytic image reconstruction; filtered backprojection algorithm;
Journal_Title :
Nuclear Science, IEEE Transactions on
DOI :
10.1109/TNS.2014.2363776
