Attenuation correction and three-dimensional filter of SPET projections

To improve quantification of Single Photon Emission Tomography (SPET) data, an analytical attenuation correction using measured attenuation coefficient maps and applied on projections has been developed. Projections corrected from attenuation require the use of an efficient filter because they are affected by noise. A three-dimensional (3D) Fourier filter has been developed. It is based on the relationship between spatial and angular frequencies. A significant improvement of the of the quantitative results (signal to noise ratio, resolution and contrast) has been observed on phantoms when compared to the routinely used filters. This method was also tested on cardiac and cerebral tomographic data.<
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