نتایج جستجو برای: osem reconstruction
تعداد نتایج: 123248 فیلتر نتایج به سال:
We would like to draw the attention of the hematology and nuclear medicine communities to the importance of standardized uptake value (SUV) harmonization in response evaluation in non-Hodgkin lymphoma (NHL) patients. In NHL patients, the response evaluation during treatment (interim positron emission tomography (PET)) is currently assessed by comparing the residual metabolic activity in the mos...
PURPOSE Investigate the possibility of reducing the number of PET detector elements per ring (introduce gaps) while maintaining image quality by employing compressed sensing techniques. METHODS A uniform Ge-68 phantom was imaged on a D-RX PET/CT scanner twice; once with all detectors operational (baseline) and once with 8 equidistant detector blocks turned off (partially sampled [PS], 11% det...
The purpose of this study is to investigate the optimal reference geometry for gamma camera calibration. Yet another question of interest was to assess the influence of the number of 3D Ordered Subsets Expectation Maximization (3D-OSEM) updates on activity quantification for SPECT imaging with 177Lu. The accuracy of 177Lu activity quantification was assessed both in small and in large objects. ...
Quantitative positron emission tomography (PET) using statistical techniques requires: d̂flk..»;„-.IK:. system geometric model that represents the probability of detecting an emission from each impgf. , pixel at each detector-pair, and (b) an iterative algorithm that reconstructs image as quaatitativfi , tt. measurements of radiotracer distribution in vivo. Conventional implementations of iterat...
Laboratory of Biostatistics and Medical Informatics, IBILI – Faculty of Medicine, University of Coimbra, Portugal Our goal is to propose and evaluate a method for choosing framing sequences for Positron Emission Tomography (PET) acquisition protocols. Data detected by PET scanners is translated into concentration of radiotracer by using image reconstruction methods. Most of these methods requir...
Whole-body PET/CT scanners are important clinical and research tools to study tracer distribution throughout the body. In whole-body studies, respiratory motion results in image artifacts. We have previously demonstrated for brain imaging that, when provided with accurate motion data, event-by-event correction has better accuracy than frame-based methods. Therefore, the goal of this work was to...
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