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We present a simulations study of the collimator sensitivity/resolution compromise as it affects the image quality of hot lesions in SPECT iterative reconstruction. We investigate three parallel-beam hexagonal-hole collimators with resolution in the center of the field of view equal to 11 mm, 15 mm, and 19 mm. We scan the Esser hot-rod phantom with 60 views and we reconstruct the images using MLEM...
In SPECT imaging with iterative reconstruction, one potential source of image noise is the limited (data or MC) statistics used for the determination of the system matrix. In this paper we present a simulations study of the effect of the system-matrix statistics on the background and signal noise. We simulate a parallel-beam, hexagonal-hole collimator and we study hot cylindrical lesions with contrasts...
The acquisition time of a PET scan is a critical parameter when designing imaging protocols for clinical nuclear medicine studies. The statistical quality of the projection data increases when longer acquisition times are selected. However, very large scanning periods can limit the number of PET studies performed and, moreover, increase the probability of motion artifacts. The competing objectives...
Several developments were made in the GATE simulation platform to allow accurate modeling of the count rate performances of PET scanners over a wide range of activity concentrations. A background noise module, a dead time and limited bandwidth modeling for the coincidences, and a delayed coincidence builder were added in the code. The results obtained for the modeling of the ECAT HRRT and Focus 220...
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