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In high resolution CT image reconstruction, a proper geometrical model is beneficial for achieving high quality images. This work aimed to improve CT image resolution with OSC (Ordered Subset Convex) reconstruction algorithm by incorporating a geometric model for the finite-size of CT detector pixels.
Recently DOI detection technologies have been rapidly developed for pre-clinical and clinical PET systems. Lack of DOI detection capability will result in serious LOR location deviation and image resolution degradation due to the detector parallax effect. Based on theoretically analyzing the probability distribution function of the DOI information, this study proposed four analytical DOI estimation...
For multi-pinhole small animal SPECT imaging, system matrix (SM) is critical for accurate reconstruction. It is typically achieved by analytical calculation, experimental measurement, or Monte-Carlo (MC) simulation. MC simulation method is relatively accurate and avoids long-time measurements. However, to achieve high resolution for small animal reconstruction, SM should be extremely huge, and would...
In this study, we design a stationary multi-pinhole SPECT collimator inserted to a small animal PET scanner and investigate the feasibility of SPECT imaging in this system with Monte Carlo simulation studies. Compared to preceding approaches, the unique aspect of the proposed design is that it enables SPECT imaging only by axial translation of the imaging object to obtain sufficient angular sampling,...
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