Abstract
This study aims to evaluate the potential for using image gating
techniques for accurate estimating random noise in clinical SPECT images.
Phantom and patient bone SPECT scans were acquired in a gated mode using
standard acquisition protocols with a dummy electronic trigger. The acquired
projection data was divided into time slots and reconstructed using the same
algorithm to produce independent sets of data. Our results showed that this
method can be used for accurate estimation of the level of random noise in
phantom and clinical SPECT studies, and it avoids the problem of pixel value
correlation faced when using small ROI in estimating noise in SPECT images.