Parallel projection based Single Photon Emission Computed Tomography (SPECT) is one of the most widely used nuclear imaging technique even nowadays. Serious artefacts are produced in the reconstructed images due to the non-homogeneous attenuation medium and the distance dependent spatial resolution (DDSR) of the parallel imaging. Effective non-uniform attenuation correction and DDSR reduction p...

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Knowledge of the statistical properties of reconstructed single photon emission computed tomography (SPECT) and positron emission tomography (PET) images would be helpful for optimizing acquisition and image processing protocols. We describe a non-parametric bootstrap approach to accurately estimate the statistical properties of SPECT or PET images whatever the noise properties in the projectio...

Over the past 20 years, SPECT myocardial perfusion imaging (MPI) has become an important tool for assessing patients with known or suspected coronary artery disease (CAD). Despite the success of SPECT MPI, laboratories that are performing these procedures are under pressure to reduce costs, improve image acquisition efficiency, reduce absorbed radiation dose, and improve diagnostic accuracy. Ph...

To be clinically useful, reconstruction in SPECT should be accomplished rapidly and also result in good image quality. Penalized likelihood methods are desirable in that they can easily incorporate system and noise models as well as prior information into an objective function. The reconstruction, computed by maximizing the objective, requires an iterative method, and this can be slow. One clas...

Introduction: Motion of the patient during myocardial perfusion SPECT could potentially results in false perfusion defects. The effect of different reconstruction methods on these artifacts is not studied. Clarification of the relation between the extent, severity and duration of motion with the resultant artifacts may be helpful in designing special soft wares for motion correction. This...

SPECT is a rapidly changing field, and the past several years have produced new developments in both hardware technology and image-processing algorithms. At the component level there have been improvements in scintillators and photon transducers as well as a greater availability of semiconductor technology. These devices permit the fabrication of smaller and more compact systems that can be cus...

introduction: ordered subset expectation maximization (osem), is an effective iterative method for spect image reconstruction. the aim of this study is the evaluation of the role of system matrix in osem image reconstruction method using four different physical beam radiation models with three detection configurations. methods: spect was done with an arc of 180 degree in 32 projections after i...

T ODAY, the majority of biomedical tomography systems on the market (e.g., modern positron emission tomog-raphy (PET), single photon emission computed tomography (SPECT), and X-ray cone-beam computed tomography (CT) devices) acquire projection data in 3-D mode. The detectors these devices employ have an axial extent which seems to increase steadily with the introduction of new systems. This all...

UNLABELLED The purpose of this study was to compare a routine bone SPECT/CT protocol using CT reconstructed with filtered backprojection (FBP) with an optimized protocol using low-dose CT images reconstructed with adaptive statistical iterative reconstruction (ASiR). METHODS In this prospective study, enrolled patients underwent bone SPECT/CT, with 1 SPECT acquisition followed by 2 randomized...