Filter hurra: a method simple for delete artifacts of the collimator in picture planar with I-131

This paper presents an analysis of the existing noise is performed on images taken by a gamma camera with high-energy collimator HE for I-131. Using the Fourier transform, dominant spatial frequencies shown in the picture next to white noise. It is demonstrated by these frequencies geometry They correspond to the spatial periodicity of the collimator itself. Finally, the use of a frequency filter that eliminates image artifacts that causes collimator, thus obtaining a cleaner image, in which to determine the FWHM and thus the size of the uptake is proposed. (Author)