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Derivation and validation of a sensitivity formula for knife-edge slit gamma camera: A theoretical and Monte Carlo simulation study

E Malekzadeh, H Rajabi, E Fiorina, F Kalantari
Journal Paper , , {Pages }

Abstract

Attenuation correction in single-photon emission computed tomography for NURBS-based cardiac-torso phantom using dual-energy acquisition

Hossein Rajabi, Hadi Taleshi Ahangari, Iraj Mohammadi, Alireza Mohammadkarim, Mohammad Ali Tajik-Mansoury
Journal Paper , 2020 September 1, {Pages }

Abstract

Single photon emission tomography is widely used to detect photons emitted from the patient. Some of these emitted photons suffer from scattering and absorption because of the attenuation occurred through their path in patient's body. Therefore, the attenuation is the most important problem in single-photon emission computed tomography (SPECT) imaging. Some of the radioisotopes emit gamma rays in different energy levels, and consequently, they have different counts and attenuation coefficients. Calculation of the parameters used in the attenuation equation N out= αN in= e− μ l N in by mathematical methods is useful for the attenuation correction. Nurbs-based cardiac-torso (NCAT) phantom with an adequate attenuation coefficient and activ

Selection of random number generators in GATE Monte Carlo toolkit

F Sepehri, M Hajivaliei, H Rajabi
Journal Paper , , {Pages }

Abstract

Dosimetry of Bone-Seeking Radiopharmaceuticals for Palliative Therapy of Bone Metastases: A Simulation Study Using GATE Monte Carlo Code

S Dalvand, H Rajabi, A Omidi, E Malekzadeh
Journal Paper , , {Pages }

Abstract

Bremsstrahlung imaging from the liver using the Monte Carlo simulation

H Rajabi, H Taleshi Ahangari
Journal Paper , , {Pages }

Abstract

A microdosimetry model of kidney by GATE Monte Carlo simulation using a nonuniform activity distribution in digital phantom of nephron

M Jabari, H Rajabi, S Dadashzadeh
Journal Paper , , {Pages }

Abstract

Cellular dosimetry of beta emitting radionuclides-antibody conjugates for radioimmunotherapy

Parisa Taheri, Hossein Rajabi, Fariba Johari Daha, Kamal Yavari, Mohammad Taghi Batiar, Hossein Mozdarani
Journal PaperIranian Journal of Nuclear Medicine , Volume 27 , Issue 2, 2019 July 1, {Pages 130-138 }

Abstract

Introduction: The choice of optimal radionuclides for radioimmunotherapy depends on several factors, especially the radionuclide and antibody. The dosimetric characteristics of a non-internalizing and an internalizing monoclonal antibody (MAb) labeled with beta emitting radionuclides were investigated.Methods: Using Geant4-DNA Monte Carlo simulation, we carry out dosimetric calculations for different subcellular distributions of beta-emitting radionuclides; 131 I, 177 Lu, 64 Cu, 186 Re and 153 Sm.Results: The dependency of theradialdose profiles on the energy spectra of electrons (beta particles and Auger and internal conversion electrons) and also their relative yield of emission is clear. The highest difference between the radionuclides t

Simultaneous respiratory motion correction and image reconstruction in 4D‐multi pinhole small animal SPECT

M Naseri, H Rajabi, J Wang, M Abbasi, F Kalantari
Journal Paper , , {Pages }

Abstract

Evaluation of the Septal Penetration and Scattering Effect in the Parallel Slat Collimator Gamma Camera On the Range Quantification in Protontherapy: Geant4 Simulation Study

E Malekzadeh, H Rajabi, F Kalantari
Journal Paper , , {Pages }

Abstract

Evaluation of cellular S-value of auger electrons emitting 111 in radionuclide by Geant4 and its comparison with MCNP5 Monte Carlo codes and MIRD published data.

MA Tajik-Mansoury, HT Ahangari, H Rajabi, M Jadidi
Journal Paper , , {Pages }

Abstract

Verification of Activity Accumulation Location Effect in Patients Treated with I-131 Radio Pharmacy on the Evaluated Exposure at Different Distances from Patient using NCAT Phantom

Mahin Kokhazadeh, Hossein Rajabi, Samira Rasaneh, Parisa Taheri
Journal Paperscientific journal of ilam university of medical sciences , Volume 25 , Issue 6, 2018 March 15, {Pages 54-62 }

Abstract

Discussion & Conclusions: Distinct TEDE values must be defined for each of the aforementioned organs and confirmed before releasing patients who will be faced to the others at short distances. Otherwise, guidelines must be considered for the others who will be faced to the released patient.

Verification of Activity Accumulation Location Effect in Patients Treated with I-131 Radio Pharmacy on the Evaluated Exposure at Different Distances from Patient usi...

Mahin Kokhazadeh, Hossein Rajabi, Samira Rasaneh, Parisa Taheri
Journal Paperscientific journal of ilam university of medical sciences , Volume 25 , Issue 6, 2018 March 15, {Pages 54-62 }

Abstract

Discussion & Conclusions: Distinct TEDE values must be defined for each of the aforementioned organs and confirmed before releasing patients who will be faced to the others at short distances. Otherwise, guidelines must be considered for the others who will be faced to the released patient.

Radiolabeling and Biodistribution of new dual modality nanoparticle probe in Nuclear Medicine

Saleh Salehi Zahabi, Hossein Rajabi, Samira Rasaneh
Journal PaperIranian Journal of Medical Physics , Volume 15 , 2018 December 1, {Pages 142-142 }

Abstract

Home; Browse: Current Issue; By Issue; By Author; By Subject; Author Index; Keyword Index. Journal Info: About Journal; Aims and Scope; Editorial Board; Editorial Staff; Publication Ethics; Indexing and Abstracting; Related Links; FAQ; Peer Review Process; News. Guide for Authors; Submit Manuscript; Reviewers; Contact Us. Login; Register. Home Articles List Article Information. Save Records; |; Printable Version; |; Recommend; |; How to cite Export to RIS EndNote BibTeX APA MLA Harvard Vancouver. |; Share Share CiteULike Mendeley Facebook Google LinkedIn Twitter Telegram. Iranian Journal of Medical Physics. Articles in Press. Current Issue. Journal Archive. Volume Volume 16 (2019). Volume Volume 15 (2018). Issue 4. Issue 3. Issue 2. Issue 1

A Microdosimetry model of kidney for nephrotoxicity due to internal radiation therapy

Masoud Jabari, Hossein Rajabi
Journal PaperIranian Journal of Medical Physics , Volume 15 , 2018 December 1, {Pages 30-30 }

Abstract

Home; Browse: Current Issue; By Issue; By Author; By Subject; Author Index; Keyword Index. Journal Info: About Journal; Aims and Scope; Editorial Board; Editorial Staff; Publication Ethics; Indexing and Abstracting; Related Links; FAQ; Peer Review Process; News. Guide for Authors; Submit Manuscript; Reviewers; Contact Us. Login; Register. Home Articles List Article Information. Save Records; |; Printable Version; |; Recommend; |; How to cite Export to RIS EndNote BibTeX APA MLA Harvard Vancouver. |; Share Share CiteULike Mendeley Facebook Google LinkedIn Twitter Telegram. Iranian Journal of Medical Physics. Articles in Press. Current Issue. Journal Archive. Volume Volume 15 (2018). Issue 4. Issue 3. Issue 2. Issue 1. Volume Volume 14 (2017)

Validation of GATE for bone and bone marrow with calculation specific absorbed fraction for photons

Seydeh Zahra Ghaseminezhad, Alireza Sadremomtaz, Hossein Rajabi
Journal PaperJournal of cancer research and therapeutics , Volume 14 , Issue 3, 2018 April 1, {Pages 647 }

Abstract

> AbstractPurpose: GATE/GEANT is a Monte Carlo code dedicated to nuclear medicine that allows calculation of the dose to organs (bone and bone marrow) of voxel phantoms. On the other hand, Medical Internal Radiation Dose (MIRD) is a well-developed system for estimation of the dose to human organs. In this study, results obtained from GATE/GEANT using leg of Snyder phantom is compared to published MIRD data.Materials and Methods: For this, the mathematical leg of Snyder phantom was discretized and converted to a digital phantom of 100? 100? 200 voxels. The activity was considered uniformly distributed within bone and bone marrow. The GATE/GEANT Monte Carlo code was used to calculate the dose to the bone and bone marrow of the leg phantom fro

analytical Calculation of Scatter Projections in Nuclear Medicine Imaging: we-f-201-09

F Kalantari, H Rajabi, A Rodriguez, S Gholami, M Tavakoli, J Wang
Journal PaperMedical Physics , Volume 44 , Issue 6, 2017 June 1, {Pages 3252 }

Abstract

Abstract unavailable for this article.

A comparison between track-structure, condensed-history Monte Carlo

H Rajabi, H Mozdarani
Journal Paper , 2017 January , {Pages }

Abstract

A comparison between track-structure, condensed-history Monte Carlo simulations and MIRD cellular S-values

MA Tajik-Mansoury, H Rajabi, H Mozdarani
Journal PaperPhysics in Medicine & Biology , Volume 62 , Issue 5, 2017 February 8, {Pages N90 }

Abstract

The S-value is a standard measure in cellular dosimetry. S-values are calculated by applying analytical methods or by Monte Carlo simulation. In Monte Carlo simulation, particles are either tracked individually event-by-event or close events are condensed and processed collectively in different steps. Both of these methods have been employed for estimation of cellular S-values, but there is no consistency between the published results. In the present paper, we used the Geant4-DNA track-structure physics model as the reference to estimate the cellular S-values. We compared the results with the corresponding values obtained from the following three condensed-history physics models of Geant4: Penelope, Livermore and standard. The geometry and

TH‐EF‐207A‐01: Respiratory Motion Correction in 4D‐Multi Pinhole Small Animal SPECT

M Naseri, H Rajabi, J Wang, F Kalantari
Journal PaperMedical physics , Volume 43 , Issue 6Part47, 2016 June , {Pages 3900-3900 }

Abstract

Purpose: Respiration causes lesion smearing, image blurring and quality degradation, affecting lesion contrast and the ability to define correct lesion size. The spatial resolution of current multi pinhole SPECT (MPHS) scanners is sub‐millimeter. Therefore, the effect of motion is more noticeable in comparison to conventional SPECT scanner. Gated imaging aims to reduce motion artifacts. A major issue in gating is the lack of statistics and individual reconstructed frames are noisy. The increased noise in each frame, deteriorates the quantitative accuracy of the MPHS Images. The objective of this work, is to enhance the image quality in 4D‐MPHS imaging, by 4D image reconstruction. Methods: The new algorithm requires deformation vector

Synthesis and Biological Evaluation of 99mTc-Chitosan Nanoparticles as a Potential Radiopharmaceutical for Liver Imaging

Hossein Rajabi, Samira Rasaneh, Saleh Salehi
Journal PaperSynthesis and Reactivity in Inorganic, Metal-Organic, and Nano-Metal Chemistry , Volume 46 , Issue 10, 2016 October 2, {Pages 1450-1454 }

Abstract

Nanoparticles are generally cleared by the reticuloendothelial system, taken up by Kupffer cells in liver. This principle can be used for liver imaging. Chitosan is an excellent biocompatible and biodegradable polymer. In this study, the authors synthesized 99mTc-chitosan nanoparticles and evaluated its potential for liver imaging. Chitosan nanoparticles were synthesized and radiolabeled with 99mTc. The labeling efficiency, stability, biodistribution, and imaging study in the normal mice was performed. Biodistribution and imaging studies demonstrated an efficient accumulation of the radiolabeled nanoparticles in the mice liver and indicated the 99mTc-chitosan nanoparticles may be considered as a promising radiopharmaceutical for liver imagi

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