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Image reconstruction is an important part of nuclear medicare imagmg technique. Different types of image reconstruction have been used for this propose. Despite of the fact that there are new techniques of image reconstruction, still filtered back projection method is widely used due to its simplicity and speed. Since nuclear medicine images are noisy due to less available photon statistics in the acquired images, therefore using proper filter to reduce the noise with keeping the proper signal is important. Two important parameters in most filters are the cut‐off frequency and (in some cases of filters) the orders of the filter function Determining the optimal cut‐off frequency for use in low pass filtering is an important part of establishing an image reconstruction strategy for clinical use. In this paper we present the result of examined filters which provide the best image quality by calculation of FWHM 1 ‐Line source and 2‐Line sources. With this result, the best filter with specific parameter for LSF and 2‐line sources is selected and the results are interpreted.