Abstract
Two methods for processing noisy transmission sinograms are compared on the basis of the sample variances of emission images reconstructed from simulated data. The first method, reconstruction-reprojection, reconstructs a transmission image, and then reprojects and exponentiates it to form a smoothed set of attenuation correction factors. The other method low-pass filters each projection in the transmission data. It showed analytically that reconstruction-reprojection significantly reduces the variance of the attenuation correction factors even when the reconstruction step uses a ramp filter. Simulations were done to determine whether this reduction emission image when compared to low-pass filtering. The results of these simulations are presented.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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