Search for: single-photon-emission-computed-tomography
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    Detection of dopamine receptors using nanoscale dendrimer for potential application in targeted delivery and whole-body imaging: synthesis and in vivo organ distribution

    , Article ACS Applied Bio Materials ; Volume 5, Issue 4 , 2022 , Pages 1744-1755 ; 25766422 (ISSN) Ramezani Farani, M ; Aminzadeh Jahromi, N ; Ali, V ; Ebrahimpour, A ; Salehian, E ; Shafiee Ardestani, M ; Seyedhamzeh, M ; Ahmadi, S ; Sharifi, E ; Ashrafizadeh, M ; Rabiee, N ; Makvandi, P ; Sharif University of Technology
    American Chemical Society  2022
    Dopamine is one of the most important neurotransmitters released by neurons in the central nervous system, and a variety of neurological illnesses and mental disorders are associated with impairments in the secretion and functionality of dopamine. Dopamine, depending on the type of receptors, can act as a stimulant or an inhibitor. In this study, dendrimer-conjugated dopamine was utilized as a chelating agent for Technetium-99m to investigate the organ distribution of this compound in vivo using the single-photon emission computed tomography (SPECT) technique. For this purpose, dendrimers were synthesized using polyethylene glycol diacid and citric acid precursors, and dopamine was... 

    Cardiac contraction motion compensation in gated myocardial perfusion SPECT: a comparative study

    , Article Physica Medica ; Volume 49 , 2018 , Pages 77-82 ; 11201797 (ISSN) Salehi, N ; Rahmim, A ; Fatemizadeh, E ; Akbarzadeh, A ; Farahani, M. H ; Farzanefar, S ; Ay, M. R ; Sharif University of Technology
    Associazione Italiana di Fisica Medica  2018
    Introduction: Cardiac contraction significantly degrades quality and quantitative accuracy of gated myocardial perfusion SPECT (MPS) images. In this study, we aimed to explore different techniques in motion-compensated temporal processing of MPS images and their impact on image quality and quantitative accuracy. Material and method: 50 patients without known heart condition underwent gated MPS. 3D motion compensation methods using Motion Freezing by Cedars Sinai (MF), Log-domain Diffeomorphic Demons (LDD) and Free-Form Deformation (FFD) were applied to warp all image phases to fit the end-diastolic (ED) phase. Afterwards, myocardial wall thickness, myocardial to blood pool contrast, and... 

    A modified PEG-Fe3O4 magnetic nanoparticles conjugated with D(+)GLUCOSAMINE (DG): mri contrast agent

    , Article Journal of Inorganic and Organometallic Polymers and Materials ; Volume 32, Issue 6 , 2022 , Pages 1988-1998 ; 15741443 (ISSN) Rezayan, A. H ; Kheirjou, S ; Edrisi, M ; Shafiee Ardestani, M ; Alvandi, H ; Sharif University of Technology
    Springer  2022
    Molecular imaging (MI) can provide not only structural images utilizing temporal imaging techniques, but also functional and molecular data using a variety of newly developed imaging techniques. Nanotechnology’s application in MI has commanded a lot of attention in recent decades, and it has provided tremendous potential for imaging living subjects. In this study, D-glucosamine conjugated functionalized magnetic iron oxide nanoparticles (Fe3O4-PEG-DG NPs) were prepared and studied as magnetic resonance imaging (MRI) contrast agents. To evaluate their distribution, single-photon emission computed tomography (SPECT) is performed. Fe3O4 NPs are made using a well-known co-precipitation process...