1
|
Hashemi S, Shirmardi SP, Hosntalab M, Sardari D, Saniei E. Internal absorbed dose calculation in body organs due to injection of Rhenium-188 labeled to Mu-9 antibody. Appl Radiat Isot 2024; 207:111235. [PMID: 38430824 DOI: 10.1016/j.apradiso.2024.111235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2023] [Revised: 01/30/2024] [Accepted: 02/12/2024] [Indexed: 03/05/2024]
Abstract
The use of radiopharmaceuticals has gained a special place in the diagnosis and treatment of cancers and evaluation of the function of different organs of the body. In this study, the absorbed dose distribution of organs after injection of 188Re-Mu-9 has been investigated using MIRD method and MCNP-4C simulation code. The 188Re-Mu-9 labeled was injected the mouse body and the amount of 188Re-labeled accumulation was evaluated after 1, 4 and 2 4 h. Having a map of the distribution of radiopharmaceutical activity in the animal body, it is possible to convert it into a human model to obtain the internal dose received by 188Re-Mu-9 injection using the MIRD calculation method and the MCNP simulation code. According to the results of the study, the animal/human model can be acceptable method for dose estimation of antibody-based radiopharmaceuticals.
Collapse
Affiliation(s)
- S Hashemi
- Medical Radiation Engineering Department, Science and Research Branch, Islamic Azad University (IAU), P.O. Box: 14515-775, Tehran, Iran
| | - S P Shirmardi
- Radiation Application Research School, Nuclear Science and Technology Research Institute (NSTRI), P.O.Box: 14395-836, Tehran, Iran.
| | - M Hosntalab
- Medical Radiation Engineering Department, Science and Research Branch, Islamic Azad University (IAU), P.O. Box: 14515-775, Tehran, Iran
| | - D Sardari
- Medical Radiation Engineering Department, Science and Research Branch, Islamic Azad University (IAU), P.O. Box: 14515-775, Tehran, Iran
| | - E Saniei
- Department of Medical Radiation Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran
| |
Collapse
|
2
|
Abtahi SMM, Bahrami F, Sardari D. An investigation into the dose rate and photon energy dependence of the GENA gel dosimeter in the MeV range. Phys Med 2023; 106:102522. [PMID: 36603480 DOI: 10.1016/j.ejmp.2022.102522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 12/22/2022] [Accepted: 12/27/2022] [Indexed: 01/05/2023] Open
Abstract
PURPOSE In the current study, the energy and dose rate dependence of a new genipin-based gel dosimeter, named GENA gel dosimeter, were investigated. METHODS Prepared gel dosimeters exposed using a Varian clinical linac. Beam qualities of 6 and 18 MV were applied to investigate the GENA gel dosimeter's energy dependence. Furthermore, the gel dosimeters were exposed to 50, 100, 200, and 350 cGy/min dose rates, ranging from 0 to 8 Gy. The irradiated gel dosimeters were read out using a double beam UV-Visible spectrophotometer. The absorbance peak (AP) and area under spectrum (AUS) were evaluated. RESULTS Absorbance-dose sensitivities of (8.0 ± 0.18) × 10-3 cm-1Gy-1 and (7.8 ± 0.15) × 10-3 cm-1Gy-1 were obtained for GENA gel dosimeter for 6 and 18 MV beam qualities, respectively. Results specified no significant difference (p > 0.05) between the GENA gel dosimeter's sensitivities irradiated using the two energies mentioned above. For the mentioned dose rates, AP-dose sensitivities of (8.2 ± 0.22) × 10-3, (8.1 ± 0.21) × 10-3, (8.1 ± 0.2) × 10-3 and (8.0 ± 0.18) × 10-3 cm-1Gy-1 were obtained, respectively. Results showed no significant difference (p > 0.05) between the GENA gel dosimeter's sensitivities for the investigated dose rates and energies. In addition, results revealed that when the incident photon energy and dose rate changed, there were no significant differences (p > 0.05) between the GENA gel dosimeter's dose resolution values. CONCLUSIONS It is concluded that the response of the GENA gel dosimeter is not dependent on the energy and dose rate (p > 0.05) within the studied energy and dose rate ranges.
Collapse
Affiliation(s)
| | - Farbod Bahrami
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
| | - Dariush Sardari
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| |
Collapse
|
3
|
Heydari M, Mohammadi K, Sardari D. SYNTHESIS OF LIF:MG,TI NANOPARTICLES BY CO-PRECIPITATION METHOD AND EVALUATION OF INCREASING THE 5A/5 RATIO IN ALPHA AND GAMMA RADIATION. Radiat Prot Dosimetry 2023; 199:1-10. [PMID: 36309853 DOI: 10.1093/rpd/ncac210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 08/13/2022] [Accepted: 09/05/2022] [Indexed: 06/16/2023]
Abstract
The peak 5 in LiF: Mg, Ti includes sub-peaks 5a and 5b, which occur at the temperatures lower and higher than that of peak 5, respectively. Peak 5a in LiF:Mg,Ti occurs due to the localized recombination of trapping/luminescence center (TC/LC), in which the electron is released from the electron trap by obtaining energy from heat and recombines through the tunneling phenomenon with a hole located in the adjacent luminescence center at a distance of 3 nm. Concerning the standard TLD tablets, which are composed of micron-sized particles, the peak 5a either does not occur or appears with very low intensity, which is insignificant in terms of dosimetry. Thus, the present study focuses on synthesizing thermoluminescent nanoparticles by co-precipitation method in several stages by citing models based on the maintenance of linear behavior of thermoluminescence nanopowders up to high doses and its relationship with localized electron-hole recombination. In addition, by changing the concentration of ingredients, altering the temperature of the reaction medium and presence or absence of surfactant, nanoparticles with suitable geometric shapes were achieved. The synthesized nanopowders were irradiated with different doses of alpha and gamma, and after analyzing the glow curves, the increase in peak 5a/5 was reported as the main factor in nanodosimetry. Based on the results, the LiF: Mg, Ti thermoluminescence nanopowders can increase the 5a/5 ratio and can be used as a convenient, inexpensive and practical tool to estimate the amount of energy deposited by the beams in nanoscale.
Collapse
Affiliation(s)
- Mahmoud Heydari
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | | | - Dariush Sardari
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| |
Collapse
|
4
|
Veiskarami A, Sardari D, Malekie S, Mofrad FB, Kashian S. Computational prediction of electrical percolation threshold in polymer/graphene-based nanocomposites with finite element method. Journal of Polymer Engineering 2022; 42:936-945. [DOI: 10.1515/polyeng-2022-0101] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/22/2023]
Abstract
Abstract
In this research work, a two-dimensional model to predict the electrical percolation threshold (EPT) of the polymer/graphene-based nanocomposites in different concentrations of the randomly dispersed inclusions in various polymer matrices is introduced using the finite element method (FEM). The predicted EPT values were validated by other experimental results for different nanocomposites. Results showed that the electrical conductivity of different nanocomposites is significantly related to the percentage weight of the reinforcing phase in the polymer matrix. Furthermore, the addition of graphene-based nano-fillers in the polymer matrix caused a decrease in the tunneling distance in nanocomposites.
Collapse
Affiliation(s)
- Amir Veiskarami
- Department of Medical Radiation Engineering, Science and Research Branch , Islamic Azad University , Tehran , Iran
| | - Dariush Sardari
- Department of Medical Radiation Engineering, Science and Research Branch , Islamic Azad University , Tehran , Iran
| | - Shahryar Malekie
- Radiation Application Research School, Nuclear Science and Technology Research Institute , P.O. Box 31485-498 , Karaj , Iran
| | - Farshid Babapour Mofrad
- Department of Medical Radiation Engineering, Science and Research Branch , Islamic Azad University , Tehran , Iran
| | - Sedigheh Kashian
- Radiation Application Research School, Nuclear Science and Technology Research Institute , P.O. Box 31485-498 , Karaj , Iran
| |
Collapse
|
5
|
Veiskarami A, Sardari D, Malekie S, Mofrad FB, Kashian S. Computational prediction of electrical percolation threshold in polymer/graphene-based nanocomposites with finite element method. Journal of Polymer Engineering 2022; 42:936-945. [DOI: https:/doi.org/10.1515/polyeng-2022-0101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/21/2023]
Abstract
Abstract
In this research work, a two-dimensional model to predict the electrical percolation threshold (EPT) of the polymer/graphene-based nanocomposites in different concentrations of the randomly dispersed inclusions in various polymer matrices is introduced using the finite element method (FEM). The predicted EPT values were validated by other experimental results for different nanocomposites. Results showed that the electrical conductivity of different nanocomposites is significantly related to the percentage weight of the reinforcing phase in the polymer matrix. Furthermore, the addition of graphene-based nano-fillers in the polymer matrix caused a decrease in the tunneling distance in nanocomposites.
Collapse
Affiliation(s)
- Amir Veiskarami
- Department of Medical Radiation Engineering, Science and Research Branch , Islamic Azad University , Tehran , Iran
| | - Dariush Sardari
- Department of Medical Radiation Engineering, Science and Research Branch , Islamic Azad University , Tehran , Iran
| | - Shahryar Malekie
- Radiation Application Research School, Nuclear Science and Technology Research Institute , P.O. Box 31485-498 , Karaj , Iran
| | - Farshid Babapour Mofrad
- Department of Medical Radiation Engineering, Science and Research Branch , Islamic Azad University , Tehran , Iran
| | - Sedigheh Kashian
- Radiation Application Research School, Nuclear Science and Technology Research Institute , P.O. Box 31485-498 , Karaj , Iran
| |
Collapse
|
6
|
Veiskarami A, Sardari D, Malekie S, Mofrad FB, Kashian S. Evaluation of dosimetric characteristics of a ternary nanocomposite based on High Density Polyethylene/Bismuth Oxide/Graphene Oxide for gamma-rays. Sci Rep 2022; 12:18798. [DOI: https:/doi.org/10.1038/s41598-022-23605-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2022] [Accepted: 11/02/2022] [Indexed: 08/21/2023] Open
Abstract
AbstractThis research aims to investigate a ternary nanocomposite based on High Density Polyethylene/ Bismuth Oxide/Graphene Oxide (HDPE/Bi2O3/GO) at various concentrations. Solution method was used to fabricate the samples. FESEM-EDX mapping, AFM, TEM, XRD, XPS, FTIR, and TGA/DTG analyses were carried out on the samples. XRD analysis demonstrated a semi-crystalline behavior for the samples. TEM analysis exhibited a cauliflower-like structure of the material. The sample was irradiated by gamma-rays of 60Co source over the dose rate of 30–254 mGy/min and the electric current was measured as the response of the real-time dosimeter. Thus, various dosimetric characteristics were performed, namely linearity, angular dependence, energy dependence, bias-polarity, field size, and repeatability of the data. Results showed that response of the dosimeter was linear in the range of the investigated dose rate. The sensitivity of the 60 wt% Bi2O3 sample was measured as 3.4 nC·mGy−1. The angular response variation was 20% for normal beam incidence. The response of the dosimeter to assess the energy dependency was obtained as 2.2% at the radiation field of the 137Cs and 60Co beams. The dosimeter response was dependent on the bias-polarity, with maximum discrepancy of 11.1%. The dosimetry response was highly dependent upon the radiation field size. The repeatability of the dosimeter response was measured with standard deviation less than 1%. As well, the dosimeter response during the one-hour irradiation was stable with a standard deviation of 0.66%. Results showed that considering some correction factors, this material can be used for dosimetry of gamma-rays at the therapy level.
Collapse
|
7
|
Tourang M, Hadadi A, Athari Allaf M, Sardari D. List mode data acquisition technique for Compton suppression and minimum detectable activity (MDA) reduction in standard high-volume air samples. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2022.109964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
8
|
Sardari D, Baradaran S, Mofrad FB, Marzban N. Monte Carlo calculation of buildup factors for 50 keV–15 MeV photons in tungsten up to 15 mean free paths. Appl Radiat Isot 2022; 183:110150. [DOI: 10.1016/j.apradiso.2022.110150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 02/09/2022] [Accepted: 02/10/2022] [Indexed: 11/29/2022]
|
9
|
Tourang M, Hadadi A, Athari Allaf M, Sardari D. A proposal to design a new high volume standard air filter for efficiency calibration of HPGe detector. J Radioanal Nucl Chem 2020. [DOI: 10.1007/s10967-020-07499-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
10
|
Taheri A, Sardari D, Sayyareh R, Sadeghi M. Dose mapping simulation and BSA design for improving the dosimetry accuracy for research reactor BNCT. JNR 2020. [DOI: 10.3233/jnr-180082] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Ali Taheri
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, P.O. Box 14515-775, Tehran, Iran
| | - Dariush Sardari
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, P.O. Box 14515-775, Tehran, Iran
| | - Reza Sayyareh
- Nuclear Science and Technology Research Institute (NSTRI), Iran
| | - Mahdi Sadeghi
- Medical Physics Department, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| |
Collapse
|
11
|
Ansari L, Nasiri N, Aminolroayaei F, Sani KG, Dorri-Giv M, Abedi-Firouzjah R, Sardari D. The Measurement of Thyroid Absorbed dose by Gafchromic™ EBT2 Film and Changes in Thyroid Hormone Levels Following Radiotherapy in Patients with Breast Cancer. J Med Signals Sens 2020; 10:42-47. [PMID: 32166076 PMCID: PMC7038746 DOI: 10.4103/jmss.jmss_10_19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Revised: 08/03/2019] [Accepted: 08/06/2019] [Indexed: 11/04/2022]
Abstract
Background: Radiotherapy is a main method for the treatment of breast cancer. This study aimed to measure the absorbed dose of thyroid gland using Gafchromic EBT2 film during breast cancer radiotherapy. In addition, the relationship between the absorbed dose and thyroid hormone levels was evaluated. Methods: Forty-six breast cancer patients, with the age ranged between 25 and 35 years, undergoing external radiotherapy were studied. The patients were treated with 6 and 18 MV X-ray beams, and the absorbed thyroid dose was measured by EBT2 film. Thyroid hormone levels, thyroid-stimulating hormone (TSH), triiodothyronine (T3), and thyroxin (T4), were measured before and after the radiotherapy. Pearson's, Spearman's, and Chi-square tests were performed to evaluate the correlation between the thyroid dose and hormone levels. Results: The mean thyroid dose was 26 ± 9.45 cGy with the range of 7.85–48.35 cGy. There were not any significant differences at thyroid hormone levels between preradiotherapy and postradiotherapy (P > 0.05). There was a significant relationship between increased thyroid absorbed dose and changes in TSH and T4 levels (P < 0.05), but it was not significant in T3 level (P = 0.1). Conclusion: Regarding the results, the thyroid absorbed dose can have an effect on its function. Therefore, the thyroid gland should be considered as an organ at risk in breast cancer radiotherapy.
Collapse
Affiliation(s)
- Leyla Ansari
- Department of Radiation Sciences, Faculty of Paramedicine, Yasuj University of Medical Science, Yasuj, Iran
| | - Neda Nasiri
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Fahimeh Aminolroayaei
- Department of Medical Physics and Radiology, School of Allied Medicine, Kashan University of Medical Sciences, Kashan, Iran
| | - Karim Ghazikhanlou Sani
- Department of Radiology, Paramedical School, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Masoumeh Dorri-Giv
- Department of Paramedical, Shahid Beheshti University of Medical Science, Tehran, Iran
| | - Razzagh Abedi-Firouzjah
- Department of Medical Physics Radiobiology and Radiation Protection, School of Medicine, Babol University of Medical Sciences, Babol, Iran
| | - Dariush Sardari
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| |
Collapse
|
12
|
Keshavarz S, Sardari D. Different distributions of gold nanoparticles on the tumor and calculation of dose enhancement factor by Monte Carlo simulation. NUCET 2019. [DOI: 10.3897/nucet.5.39096] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
Gold nanoparticles can be used to increase the dose of the tumor due to its high atomic number as well as being free from apparent toxicity. The aim of this study is to evaluate the effect of distribution of gold nanoparticles models, as well as changes in nanoparticle sizes and spectrum of radiation energy along with the effects of nanoparticle penetration into surrounding tissues in dose enhancement factor DEF. Three mathematical models were considered for distribution of gold nanoparticles in the tumor, such as 1-uniform, 2- non-uniform distribution with no penetration margin and 3- non-uniform distribution with penetration margin of 2.7 mm of gold nanoparticles. For this purpose, a cube-shaped water phantom of 50 cm size in each side and a cube with 1 cm side placed at depth of 2 cm below the upper surface of the cubic phantom as the tumor was defined, and then 3 models of nanoparticle distribution were modeled. MCNPX code was used to simulate 3 distribution models. DEF was evaluated for sizes of 20, 25, 30, 50, 70, 90 and 100 nm of gold nanoparticles, and 50, 95, 250 keV and 4 MeV photon energies. In uniform distribution model the maximum DEF was observed at 100 nm and 50 keV being equal to 2.90, in non-uniform distribution with no penetration margin, the maximum DEF was measured at 100 nm and 50 keV being 1.69, and in non-uniform distribution with penetration margin of 2.7 mm, the maximum DEF was measured at 100 nm and 50 keV as 1.38, and the results have been showed that the dose was increased by injecting nanoparticles into the tumor. It is concluded that the highest DEF could be achieved in low energy photons and larger sizes of nanoparticles. Non-uniform distribution of gold nanoparticles can increase the dose and also decrease the DEF in comparison with the uniform distribution. The non-uniform distribution of nanoparticles with penetration margin showed a lower DEF than the non-uniform distribution without any margin and uniform distribution. Meanwhile, utilization of the real X-ray spectrum brought about a smaller DEF in comparison to mono-energetic X-ray photons.
Collapse
|
13
|
Karami-Gadallo L, Ataie-Fashtami L, Ghoranneviss M, Pouladian M, Sardari D. Cell damaging by irradiating non-thermal plasma to the water: Mathematical modeling of chemical processes. Mol Biol Res Commun 2018; 7:133-141. [PMID: 30426031 DOI: 10.22099/mbrc.2018.29751.1325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 09/30/2022]
Abstract
Recently non-thermal plasma (NTP) is applied for many therapeutic applications. By NTP irradiating to the tissues or cell-lines, the water molecules (H2O) would be also activated leading to generate hydrogen peroxide (H2O2). By irradiating plasma to bio-solution, its main output including vacuum UV to UV causes the photolysis of H2O leading to generate hydroxyl (OH) molecules in couple forms with ability to convert to H2O2. Additionally, other plasma's output the oxygen atoms could also penetrate under the liquid's surface and react with H2O to generate H2O2. In NTP applications for killing unwanted-cells of microorganisms (e.g. sterilization) or cancerous tissues, the H2O2 molecule is the main reactive species for cell death via inducing DNA damage in mammalian cells. In this paper we proposed a mathematical model for NTP application describing the formation of hydroxyls in the bio solution and other subsequent reactions leading to DNA damage in vitro. The instant concentrations of the OH and H2O2, the main species for DNA oxidation were obtained and investigated in this simulation. In order to validate the model, the cellular response to NTP stimulation was compared with some experimental findings from viewpoint of DNA damage to show the significant consistency.
Collapse
Affiliation(s)
- Leila Karami-Gadallo
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Leila Ataie-Fashtami
- Department of Regenerative Medicine, Royan Institute for Stem Cell Biology & Technology, Tehran, Iran
| | - Mahmood Ghoranneviss
- Department of Plasma Physics, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Majid Pouladian
- Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.,Research Center of 'Engineering in Medicine and Biology', Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Dariush Sardari
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| |
Collapse
|
14
|
Madani N, Sardari D, Hosntalab M, Zobdeh P. Real time dose rate meter for gamma radiation using LDPE and PMMA in presence of 1–5 kV/mm electric field. Radiat Phys Chem Oxf Engl 1993 2018. [DOI: 10.1016/j.radphyschem.2018.06.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
15
|
Jalalabadi Y, Shirazi A, Ghavam-Nasiri MR, Aledavood SA, Sardari D, Memar B, Shahidsales S, VarshoeeTabrizi F, Dehghan P, Vosughiniya H. Evaluating the expression of cyclooxygenase-2 enzyme by immunohistochemistry in normal and tumoral tissue before and after neoadjuvant chemoradiotherapy in patients with esophageal cancer in Khorasan Province. J Cancer Res Ther 2018; 14:509-515. [PMID: 29893307 DOI: 10.4103/0973-1482.199428] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Background Esophageal cancer is the third most common cancer in Iran. Neoadjuvant chemoradiotherapy (NCRT) is the appropriate treatment for esophageal cancer. Aim This study investigated the expression of cyclooxygenase (COX)-2 enzyme in normal and tumoral tissues before any treatment in patients with esophageal cancer, this study also assessed the effect of NCRT on the expression of COX-2 enzyme in normal and tumoral tissue in samples derived by surgery furthermore, and this study investigated the relationship between expression of COX-2 enzyme and the pathologic tumor regression grade (PTRG) patients. Materials and Methods In this study, a total of 120 patients admitted to Omid Hospital, Imam Reza Hospitals, and Reza-Mashhad Medical Center, who were treated with NCRT, were recruited and the expression of the COX-2 enzyme in normal and tumoral tissues was assessed by immunohistochemistry before and after treatment by an expert pathologist between zero and 300. PTRG was determined by a pathologist after treatment. Results The mean levels of COX-2 expression, obtained from tumoral and normal tissue baseline biopsy in patients, were 177.69 and 64.29, respectively, while in surgical specimen were 177.25 and 49.84, respectively. A significant association was found between PTRG of surgical specimen and COX-2 expression in normal tissue (baseline biopsy) at diagnosis (P = 0.034). Conclusions The results indicated that expression of COX-2 in tumoral tissues exceeds the expression of COX-2 in normal tissue of the baseline biopsy. Patients with a high expression of COX-2 in baseline tumor biopsies had less response to treatment of pathology compared to patients with lower expression of COX-2 in baseline tumor biopsies.
Collapse
Affiliation(s)
- Yousef Jalalabadi
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Alireza Shirazi
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University; Department of Medical Physics and Biomedical Engineering, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | | | | | - Dariush Sardari
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Bahram Memar
- Cancer Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | | | | | - Parvane Dehghan
- Torbat Heydariyeh University of Medical Sciences, Torbat Heydariyeh, Mashhad, Iran
| | - Hassan Vosughiniya
- Department of Internal Medicine, Ghaem Hospital, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| |
Collapse
|
16
|
Adinehvand K, Sardari D, Hosntalab M, Pouladian M. Comparison of the effectiveness of polymer gel dosimeters (Magic and Pagatug) for organ dose calculation in brachytherapy, nuclear medicine and teletherapy. TROP J PHARM RES 2018. [DOI: 10.4314/tjpr.v16i11.22] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
|
17
|
Azadbar A, Sardari D, Kardan M, Baradaran S. Retrospective radon measurements based on implanted 210Po in glass objects using polycarbonate detectors. NUCL TECH RAD PROT 2018. [DOI: 10.2298/ntrp1802167a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
In the present investigation, a surface-deposited polonium was measured in
37 houses in Rasht and Ramsar cities of Iran with the aim of evaluating the
retrospective radon concentration. The CR-LR technique is widely
used in this regard, but for the first time, Lexan polycarbonate
detectors were used to measure the activity of 210Po planted in glassy
objects. These detectors were placed on glassy surfaces for 153 to 365 days.
A passive cylindrical diffusion chamber was used for the contemporary
radon concentration measurements. The diffusion chamber consists of the
Lexan polycarbonate films as a solid state nuclear track detectors and
filter. The surface-deposited 210Po activity concentration was found to vary
from 0.26 to 11.96 mBqcm-2 with average of 2.62 mBqcm-2. The sensitivity of
210Po to polycarbonate was determined to be 0.06456 track per cm2 per
mBqhcm-2. Thus, the radon concentration was found to vary from 122 to
4840 Bqm-3 with an average value 1243 Bqm-3 and the contemporary radon
concentration in the area was found to vary from 15 to 2420 Bqm-3 with an
average 513 Bqm-3. The results indicate that there is a significant
correlation between the concentration of the retrospective radon and the
concentration of the contemporary radon gas in the indicated areas with a
coefficient of 0.80672.
Collapse
Affiliation(s)
- Alireza Azadbar
- Islamic Azad University, Science and Research Branch, Department of Medical Radiation Engineering, Tehran, Iran
| | - Dariush Sardari
- Islamic Azad University, Science and Research Branch, Department of Medical Radiation Engineering, Tehran, Iran
| | | | | |
Collapse
|
18
|
Adinehvand K, Sardari D, Hosntalab M, Pouladian M. An efficient multistage segmentation method for accurate hard exudates and lesion detection in digital retinal images. IFS 2017. [DOI: 10.3233/jifs-17199] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Karim Adinehvand
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Dariush Sardari
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Mohammad Hosntalab
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Majid Pouladian
- Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| |
Collapse
|
19
|
Golgoun SM, Sardari D, Sadeghi M, Mofrad FB. A novel method of combined detector model for gamma-ray densitometer: Theoretical calculation and MCNP4C simulation. Appl Radiat Isot 2016; 118:246-250. [PMID: 27689309 DOI: 10.1016/j.apradiso.2016.09.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Revised: 09/17/2016] [Accepted: 09/18/2016] [Indexed: 11/28/2022]
Abstract
This study focuses on investigating a new model of combined backscatter and transmission method for nuclear densitometer. In this method for density measurement, a true combination of transmission and backscatter methods was studied and related equations were developed. The MCNP4C code was used for simulation of this combined detector model (CDM) and by applying theoretical calculations, density equation was corrected for the proposed nuclear densitometer. In the new method presented here, the buildup effect was estimated by an online system that was improved in our laboratory and was replaced by a new conceptual calculation. Hence, for the purpose of buildup reduction, there was no need for the shield around the detector, as it was monitored and reduced online. Furthermore, this study showed that the RSQ function could be improved by the CDM. The measurement technique proposed in this study has a better linearity trend than the transmission technique. Thus, the ability of CDM to improve the accuracy of the nuclear densitometer was shown.
Collapse
Affiliation(s)
- S M Golgoun
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, P.O. Box 14515-775, Tehran, Iran
| | - D Sardari
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, P.O. Box 14515-775, Tehran, Iran
| | - M Sadeghi
- Radiation Application Research School, Nuclear Science and Technology Research Institute, Tehran, Iran.
| | - F Babapour Mofrad
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, P.O. Box 14515-775, Tehran, Iran
| |
Collapse
|
20
|
Sarbazvatan S, Sardari D, Taheri N, Sepanloo K. Response of single cell with acute angle exposed to an external electric field. Med Eng Phys 2015; 37:1015-9. [PMID: 26307458 DOI: 10.1016/j.medengphy.2015.08.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Revised: 04/01/2015] [Accepted: 08/04/2015] [Indexed: 12/21/2022]
Abstract
It is known that the electric field incurs effects on the living cells. Predicting the response of single cell or multilayer cells to induced alternative or static eclectic field has permanently been a challenge. In the present study a first order single cell with acute angle under the influence of external electric field is considered. The cell division stage or the special condition of reshaping is modelled with a cone being connected. In the case of cell divisions, anaphase, it can be considered with two cones that connected nose-to-nose. Each cone consists of two regions. The first is the membrane modelled with a superficial layer, and the second is cytoplasm at the core. A Laplace equation is written for this model and the distribution of its electric field is a sharp point in the single cell for which an acute angle model is calculated.
Collapse
Affiliation(s)
- Saber Sarbazvatan
- Faculdade de Ciências, Universidade do Porto- Rua do Campo Alegre, 4169-007, Porto, Portugal .
| | - Dariush Sardari
- Plasma Physics Building, Islamic Azad University, Science & Research Branch, Tehran, P.O. Box 14515-775, Iran
| | - Nahid Taheri
- Faculdade de Ciências, Universidade do Porto- Rua do Campo Alegre, 4169-007, Porto, Portugal
| | - Kamran Sepanloo
- Reactor & Accelerators Research and Development School, Nuclear Science and Technology Research Institute (NSTRI), End of North Karegar Street, P.O. Box 14395-836, Tehran, Iran
| |
Collapse
|
21
|
Shokri S, Soltani A, Kazemi M, Sardari D, Mofrad FB. Effects of Wi-Fi (2.45 GHz) Exposure on Apoptosis, Sperm Parameters and Testicular Histomorphometry in Rats: A Time Course Study. Cell J 2015. [PMID: 26199911 PMCID: PMC4503846 DOI: 10.22074/cellj.2016.3740] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Objective In today’s world, 2.45-GHz radio-frequency radiation (RFR) from industrial,
scientific, medical, military and domestic applications is the main part of indoor-outdoor
electromagnetic field exposure. Long-term effects of 2.45-GHz Wi-Fi radiation on male
reproductive system was not known completely. Therefore, this study aimed to investigate
the major cause of male infertility during short- and long-term exposure of Wi-Fi radiation.
Materials and Methods This is an animal experimental study, which was conducted in
the Department of Anatomical Sciences, Faculty of Medicine, Zanjan University of Medical Sciences, Zanjan, IRAN, from June to August 2014. Three-month-old male Wistar rats
(n=27) were exposed to the 2.45 GHz radiation in a chamber with two Wi-Fi antennas on
opposite walls. Animals were divided into the three following groups: I. control group (n=9)
including healthy animals without any exposure to the antenna, II. 1-hour group (n=9) exposed to the 2.45 GHz Wi-Fi radiation for 1 hour per day during two months and III.7-hour
group (n=9) exposed to the 2.45 GHz Wi-Fi radiation for 7 hours per day during 2 months.
Sperm parameters, caspase-3 concentrations, histomorphometric changes of testis in addition to the apoptotic indexes were evaluated in the exposed and control animals.
Results Both 1-hour and 7-hour groups showed a decrease in sperm parameters in a
time dependent pattern. In parallel, the number of apoptosis-positive cells and caspase-3
activity increased in the seminiferous tubules of exposed rats. The seminal vesicle weight
reduced significantly in both1-hour or 7-hour groups in comparison to the control group.
Conclusion Regarding to the progressive privilege of 2.45 GHz wireless networks in
our environment, we concluded that there should be a major concern regarding the timedependent exposure of whole-body to the higher frequencies of Wi-Fi networks existing in
the vicinity of our living places.
Collapse
Affiliation(s)
- Saeed Shokri
- Department of Anatomical Sciences, Faculty of Medicine, Zanjan University of Medical Sciences (ZUMS), Zanjan, Iran
| | - Aiob Soltani
- Department of Nuclear Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Mahsa Kazemi
- Department of Physiology, Faculty of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran
| | - Dariush Sardari
- Department of Nuclear Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Farshid Babapoor Mofrad
- Department of Nuclear Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| |
Collapse
|
22
|
Golgoun SM, Sardari D, Sadeghi M, Ebrahimi M, Aminipour M, Davarpanah MR. Combined backscatter and transmission method for nuclear density gauge. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/201510002004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
23
|
Shafaei M, Ziaie F, Sardari D, Larijani MM. Thermoluminescence properties of gamma-irradiated nano-structure hydroxyapatite. LUMINESCENCE 2015; 31:223-8. [PMID: 26015169 DOI: 10.1002/bio.2949] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2015] [Revised: 04/24/2015] [Accepted: 04/26/2015] [Indexed: 11/11/2022]
Abstract
The suitability of nano-structured hydroxyapatite (HAP) for use as a thermoluminescence dosimeter was investigated. HAP samples were synthesized using a hydrolysis method. The formation of nanoparticles was confirmed by X-ray diffraction and average particle size was estimated to be ~30 nm. The glow curve exhibited a peak centered at around 200 °C. The additive dose method was applied and this showed that the thermoluminescence (TL) glow curves follow first-order kinetics due to the non-shifting nature of Tm after different doses. The numbers of overlapping peaks and related kinetic parameters were identified from Tm -Tstop through computerized glow curve deconvolution methods. The dependence of the TL responses on radiation dose was studied and a linear dose response up to 1000 Gy was observed for the samples.
Collapse
Affiliation(s)
- M Shafaei
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - F Ziaie
- Radiation Application Research School, Nuclear Science & Technology Research Institute, Tehran, Iran
| | - D Sardari
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - M M Larijani
- Radiation Application Research School, Nuclear Science & Technology Research Institute, Tehran, Iran
| |
Collapse
|
24
|
Abstract
Abstract
In this study, carbonated hydroxyapatite nanoparticles were used for thermoluminescence dosimetry. The nano-structure carbonated hydroxyapatite synthesized via hydrolysis of CaHPO4 and CaCO3. The obtained nano powders were characterized by XRD technique and FTIR spectroscopy system. The carbonated hydroxyapatite samples were irradiated at different doses using 60Co gamma rays, and were subjected to thermoluminescence measurement system, consequently. The TL glow curve exhibited two distinguishable peaks centered at around of 165°C and 310°C. The TL response of carbonated hydroxyapatite samples as a function of absorbed dose was linear in the range of 25–1000 Gy. Other dosimetric features of the carbonated hydroxyapatite nanoparticles including fading and reproducibility were also investigated.
Collapse
Affiliation(s)
- M. Shafaei
- Department of Medical Radiation Engineering , Science and Research Branch, Islamic Azad University, Tehran , Iran
| | - F. Ziaie
- Radiation Application Research School , Nuclear Science & Technology Research Institute, Tehran , Iran
| | - D. Sardari
- Department of Medical Radiation Engineering , Science and Research Branch, Islamic Azad University, Tehran , Iran
| | - M. M. Larijani
- Radiation Application Research School , Nuclear Science & Technology Research Institute, Tehran , Iran
| |
Collapse
|
25
|
Khaledi N, Arbabi A, Sardari D, Mohammadi M, Ameri A. Simultaneous production of mixed electron--photon beam in a medical LINAC: A feasibility study. Phys Med 2015; 31:391-7. [PMID: 25773884 DOI: 10.1016/j.ejmp.2015.02.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2014] [Revised: 02/20/2015] [Accepted: 02/23/2015] [Indexed: 10/23/2022] Open
Abstract
PURPOSE The electron or photon beams might be used for treatment of tumors. Each beam has its own advantage and disadvantages. Combo beam can increase the advantages. No investigation has been performed for producing simultaneous mixed electron and photon beam. In current study a device has been added to the Medical Linac to produce a mixed photon-electron beam. METHODS Firstly a Varian 2300CD head was simulated by MCNP Monte Carlo Code. Two sets of perforated lead sheets with 1 and 2 mm thickness and 0.2, 0.3, and 0.5 cm punches then placed at the top of the applicator holder tray. This layer produces bremsstrahlung x-ray upon impinging fraction electrons on it. The remaining fraction of electrons passes through the holes. The simulation was performed for 10 × 10, 6 × 6, and 4 × 4 cm(2) field size. RESULTS For 10 × 10 cm(2) field size, among the punched targets, the largest penumbra difference between the depth of 1 and 7 cm was 72%. This difference for photon and electron beams were 31% and 325% respectively. A maximum of 39% photon percentage was produced by 2 mm target with 0.2 cm holes diameter layer. The minimum surface dose value was 4% lesser than pure electron beam. For small fields, unlike the pure electron beam, the PDD, penumbra, and flatness variations were negligible. CONCLUSIONS The advantages of mixing the electron and photon beam is reduction of pure electron's penumbra dependency with the depth, especially for small fields, also decreasing of dramatic changes of PDD curve with irradiation field size.
Collapse
Affiliation(s)
- Navid Khaledi
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Azim Arbabi
- Department of Radiotherapy, Imam Hossein Hospital, Shahid Beheshti Medical University, Tehran, Iran
| | - Dariush Sardari
- Department of Medical Radiation Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
| | - Mohammad Mohammadi
- Department of Medical Physics, Hamedan Medical University, Hamedan, Iran
| | - Ahmad Ameri
- Department of Radiotherapy, Imam Hossein Hospital, Shahid Beheshti Medical University, Tehran, Iran
| |
Collapse
|
26
|
Mahdavi SR, Esmaeeli AD, Pouladian M, Monfared AS, Sardari D, Bagheri S. Breast dosimetry in transverse and longitudinal field MRI-Linac radiotherapy systems. Med Phys 2015; 42:925-36. [DOI: 10.1118/1.4906193] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
27
|
Aghayan SA, Sardari D, Mahdavi SRM, Mohammadi M. Enhancing the properties of beam forming bolus in hyperthermia: numerical simulation and empirical verification. Australas Phys Eng Sci Med 2014; 37:691-703. [PMID: 25318411 DOI: 10.1007/s13246-014-0306-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2014] [Accepted: 10/08/2014] [Indexed: 11/26/2022]
Abstract
In this paper we present a simulation study of the induced specific absorption rate (SAR) within the phantom produced by radiofrequency radiation from a 8 MHz capacitive applicator. The main focus of the current study is on demonstrating the beam shaping properties of the bolus system as well as its effect on controlling the therapeutic area. Different electrical conductivities and geometries of the bolus were considered in the simulation of induced SAR distributions in a muscle-equivalent model with uniform dielectric properties. To validate the presented model, we carried out a comparison between the SAR simulation results and the temperature measurements in an agar split-phantom and an excellent agreement was observed.
Collapse
Affiliation(s)
- Seyed Ali Aghayan
- Department of Engineering, Science and Research Branch, Islamic Azad University, 14155-775, Tehran, 14778 93855, Islamic Republic of Iran,
| | | | | | | |
Collapse
|
28
|
Hadadi A, Sadeghi M, Sardari D, Khanchi A, Shirazi A. Monte Carlo characterization of biocompatible beta-emitting 90Y glass seed incorporated with the radionuclide 153Sm as a SPECT marker for brachytherapy applications. J Appl Clin Med Phys 2013; 14:90-103. [PMID: 24036862 PMCID: PMC5714572 DOI: 10.1120/jacmp.v14i5.4302] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Revised: 04/03/2013] [Accepted: 04/01/2013] [Indexed: 11/30/2022] Open
Abstract
A glass seed consisting of the β--emitting radionuclide 90Y incorporated with radionuclide 153Sm as SPECT marker is proposed for potential application in brachytherapy in order to reduce the undesirable dose to healthy adjacent organs. The aim of this work is to determine the dosimetric characteristics, as suggested in the AAPM TG-60/TG-149 reports, for this seed using Monte Carlo simulation. Monte Carlo codes MCNP5, EGSnrc, and FLUKA were used to calculate the absorbed dose distribution around the seed. Dosimetric parameters, such as reference absorbed dose rate, radial dose function, and one-dimensional (1D) and two-dimensional (2D) anisotropy functions, were obtained. The computational results from these three codes are in agreement within 5.4% difference on average. The absorbed dose rate at the reference point was estimated to be 5.01 cGy h-1 μCi-1 and self absorption of YAS glass seed amounted to 30.51%. The results showed that, with thermal neutron bombardment of 5 hours in a typical flux, sufficient activity for applications in brachytherapy may be achieved. With a 5 mCi initial activity, the total dose of a YAS glass seed was estimated to be 1.38 Gy at 1.0 cm from the seed center. Comparing with gamma emitting seeds, the 90Y seed could reduce undesirable doses to adjacent organs, because of the rapid dose falloff of beta ray. Because of the high R90 value of 5.5 mm, fewer number of 90Y seeds will be required for an interstitial brachytherapy treatment using permanent implant, in comparison with other beta-emitting seeds. The results would be helpful in the development of the radioactive implants using 90Y glass seeds for the brachytherapy treatment.
Collapse
|
29
|
Safigholi H, Sardari D, Sina S, Jashni SK, Mosleh-Shirazi M, Karbasi S, Massicano F, Possoni RG, Yoriyaz H, Meigooni A. SU-E-T-525: Developing a GYN Cs-Selectron Brachytherapy Treatment Planning Software Accounting for Inter-Source, Applicator and Heterogeneity Effects. Med Phys 2013. [DOI: 10.1118/1.4814955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
30
|
Safigholi H, Sardari D, Jashni SK, Meigooni A. SU-E-T-551: A Novel Analytical Model to Determine Inhomogeneity Correction Factor in TG-43U1 Low Dose Rate Brachytherapy. Med Phys 2013. [DOI: 10.1118/1.4814980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
31
|
Safigholi H, Sardari D, Jashni SK, Meigooni A. SU-E-T-527: A Fast Novel Analytical Model Accounting for Interseed Attenuation Effect in Low Energy Brachytherapy Sources. Med Phys 2013. [DOI: 10.1118/1.4814957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
|
32
|
Safigholi H, Sardari D, Karimi Jashni S, Mahdavi SR, Meigooni AS. An analytical model to determine interseed attenuation effect in low-dose-rate brachytherapy. J Appl Clin Med Phys 2013; 14:4226. [PMID: 23652254 PMCID: PMC5714425 DOI: 10.1120/jacmp.v14i3.4226] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2012] [Revised: 11/22/2012] [Accepted: 12/25/2012] [Indexed: 11/23/2022] Open
Abstract
Brachytherapy treatment planning systems (BTPS) are employing the American Association of Physicists in Medicine (AAPM) Task Group 43 (TG‐43)‐recommended dosimetric parameters of sources, which are measured in water. The majority of brachytherapy implant volumes are not homogeneous media. Particularly, an implant with multiple seeds significantly changes homogeneity of the implant volume. Heterogeneities, such as attenuation by adjacent seeds or interseed attenuation (ISA), are neglected to this day in all BTPS. The goal of this project is to determine a novel analytical method to evaluate the impact of the dose perturbations (P‐value) and/or interseed attenuation effect (ISA‐value). This method will be validated for low‐ and high‐energy brachytherapy seeds such as 125I and 192Ir using Monte Carlo (MC) simulation techniques. In this analytical model, determination of dose perturbation and interseed attenuation in a multisource brachytherapy implant is based on MC‐simulated 3D kernels of P‐values and ISA data for single active and single dummy configurations, arranged at different distances and orientations relative to each other. The accuracy of the final model in multisource implant configurations has been examined by a comparison of the calculated P‐values and ISA‐values with full Monte Carlo water simulations (FMCWS). This model enabled us to determine the total perturbation and ISA values for any multisource implant, and the results are in excellent agreement with the FMCWS data. The advantage of this model to FMCWS for daily clinical application is the speed of the calculations and ease of the implementation. The new perturbation and ISA formulism have shown a better accuracy for 192Ir than 125I due to Compton scattering and its independence of the atomic number of the chemical composition of the phantom materials. The maximum difference between the ISA model and FMCWS for all cases was less than 5%. This new model can provide inputs for brachytherapy planning software to consider the ISA effect in dose calculations based on TG‐43U1 algorithm. This approach is applicable for energy range of 125I to 192Ir sources. PACS number: 87.53.Jw
Collapse
Affiliation(s)
- Habib Safigholi
- Department of Radiation Medical Engineering,1 Science and Research Branch, Islamic Azad University, Tehran, Iran.
| | | | | | | | | |
Collapse
|
33
|
Kurudirek M, Sardari D, Khaledi N, Çakır C, Mann K. Investigation of X- and gamma ray photons buildup in some neutron shielding materials using GP fitting approximation. ANN NUCL ENERGY 2013. [DOI: 10.1016/j.anucene.2012.08.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
34
|
Sardari D, Hakimi A. Modeling the time dependent distribution of a new (153)Sm complex for targeted radiotherapy purpose. Rep Pract Oncol Radiother 2012; 17:358-62. [PMID: 24377038 PMCID: PMC3863299 DOI: 10.1016/j.rpor.2012.07.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2011] [Revised: 05/28/2012] [Accepted: 07/10/2012] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND For radioimmunotherapy purposes, a chemical complex with high absorption in cancer tumor is required. New chemicals are to be examined for their concentration in tumor and healthy organs. These are labeled with β-emitting radioisotopes to irradiate the tumor while deposited inside it. AIM To study the capability of recently developed chemical complex in targeting cancer tumor and investigate the distribution of (153)Sm-TPTTC in rat organs as function of time. MATERIALS AND METHODS The chemical complex - [Tris(1,10-phenanthroline)Samarium(III)] trithiocyanate was prepared and labeled with (153)Sm radioisotope. The labeled complex was injected to a population of tumor bearing mice. In 2, 4, 24, 48, 96 h after injection the animals were sacrificed and the concentration of Samarium complex was measured in various organs such as blood, heart, intestine, colon, liver, spleen, kidney, sternum and bone. RESULTS The concentration of the radiopharmaceutical in various organs was measured at different times. The temporal behavior of biodistribution of (153)Sm-TPTTC was modeled and drawn as function of time. CONCLUSION It is shown that (153)Sm-TPTTC is concentrated in tumor tissue and liver much more than in other organs. The variation of pharmaceutical concentration in all organs is described with summation of eight exponential terms and it approximates our experimental data with precision better than 2%.
Collapse
Affiliation(s)
- Dariush Sardari
- Department of Nuclear Engineering, Science and Research Branch, Islamic Azad University, Tehran, P.O. Box 14515-775, Iran
| | | |
Collapse
|
35
|
Khaledy N, Arbabi A, Sardari D. The effects of cutouts on output, mean energy and percentage depth dose of 12 and 14 MeV electrons. J Med Phys 2012; 36:213-9. [PMID: 22228930 PMCID: PMC3249732 DOI: 10.4103/0971-6203.89970] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2011] [Revised: 04/11/2011] [Accepted: 07/21/2011] [Indexed: 11/21/2022] Open
Abstract
Electron field-shaping cerrobend cutouts on the linear accelerator applicator have some effects on the output and percentage depth dose. These effects which arise from the lateral scatter nonequilibrium are particularly evident in higher energies and in cutouts with smaller radius. Dose measurements for circular, square, and triangular cutouts as well as open field was performed in a 10 × 10 cm applicator, using plane parallel type ion chamber with a 100 cm source surface distance. The Percentage Depth Doses curves were drawn and the outputs were measured for each of these cutouts. The output factors, normalized to open 10 × 10 cm field, varied between 0.891 and 0.996 depending on the energy, cutout shape, and cavity area. With the use of cutouts, R100 shifted toward the surface. The shifts ranged from 9 to 0 mm and from 13 to 0 mm for 12 and 14 MeV, respectively, depending on the shape and cavity area. For R90, R80, and R50 the ranges for observed shifts narrowed down and practically no shifts were observed for R20. We present these changes in the form of predictive formulas, which would be useful in clinical applications.
Collapse
Affiliation(s)
- Navid Khaledy
- Young Researchers Club, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | | | | |
Collapse
|
36
|
Ghorbani P, Sardari D, Bayat E, Doostmohammadi V. Neutron beam preparation with Am–Be source for analysis of biological samples with PGNAA method. J Radioanal Nucl Chem 2011. [DOI: 10.1007/s10967-011-1359-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
37
|
Abstract
Buildup factor of gamma and X-ray photons in the energy range of 0.2-2 MeV in water and soft tissue is computed using Monte Carlo code MCNP4C. The results are compared with the buildup factor data of pure water. A new relationship estimating buildup factor as a function of penetration depth, Compton scattering and energy absorption cross sections is introduced. The new relationship estimates buildup factor with 5 % deviation compared with the existing data.
Collapse
Affiliation(s)
- D Sardari
- Islamic Azad University, Science and Research Branch, Tehran, Iran.
| | | |
Collapse
|
38
|
Abstract
It is already known that electrostatic, magnetostatic, extremely low-frequency electric fields, and pulsed electric field could be utilized in cancer treatment. The healing effect depends on frequency and amplitude of electric field. In the present work, a simple theoretical model is developed to estimate the intensity of electrostatic field that damages a living cell during division. By this model, it is shown that magnification of electric field in the bottleneck of dividing cell is enough to break chemical bounds between molecules by an avalanche process. Our model shows that the externally applied electric field of 4 V/cm intensity is able to hurt a cancer cell at the dividing stage.
Collapse
Affiliation(s)
- Dariush Sardari
- Faculty of Engineering, Science and Research Branch, Azad University, Tehran, Iran.
| | | |
Collapse
|
39
|
Sardari D, Maleki R, Samavat H, Esmaeeli A. Measurement of depth-dose of linear accelerator and simulation by use of Geant4 computer code. Rep Pract Oncol Radiother 2010; 15:64-8. [PMID: 24376926 DOI: 10.1016/j.rpor.2010.03.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2009] [Accepted: 03/20/2010] [Indexed: 10/19/2022] Open
Abstract
Radiation therapy is an established method of cancer treatment. New technologies in cancer radiotherapy need a more accurate computation of the dose delivered in the radiotherapy treatment plan. This study presents some results of a Geant4-based application for simulation of the absorbed dose distribution given by a medical linear accelerator (LINAC). The LINAC geometry is accurately described in the Monte Carlo code with use of the accelerator manufacturer's specifications. The capability of the software for evaluating the dose distribution has been verified by comparisons with measurements in a water phantom; the comparisons were performed for percentage depth dose (PDD) and profiles for various field sizes and depths, for a 6-MV electron beam. Experimental and calculated dose values were in good agreement both in PDD and in transverse sections of the water phantom.
Collapse
Affiliation(s)
- D Sardari
- Faculty of Engineering, Science and Research Branch, Islamic Azad University, P.O. Box 14515-775, Tehran, Iran
| | - R Maleki
- Faculty of Engineering, Science and Research Branch, Islamic Azad University, P.O. Box 14515-775, Tehran, Iran
| | - H Samavat
- Department of Medical Physics, Hamadan University of Medical Science, Hamadan, Iran
| | - A Esmaeeli
- Faculty of Engineering, Science and Research Branch, Islamic Azad University, P.O. Box 14515-775, Tehran, Iran
| |
Collapse
|
40
|
Doostmohammadi V, Sardari D, Nasrabadi AM. Combined application of Monte Carlo method and neural networks to simulate qualitative prompt gamma neutron activation analysis. J Radioanal Nucl Chem 2009. [DOI: 10.1007/s10967-009-0413-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
41
|
Khaledy N, Arbabi A, Sardari D, Ghalibaflan M, Khaledy N, Dabaghi M, Mohammadi E, Masudie M. EFFECT OF CIRCULAR CUTOUTS ON THE OUTPUT PARAMETERS OF THE LINAC, FOR 12MEV ELECTRONS. Radiother Oncol 2009. [DOI: 10.1016/s0167-8140(12)72984-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
42
|
Sardari D, Abbaspour A, Baradaran S, Babapour F. Estimation of gamma- and X-ray photons buildup factor in soft tissue with Monte Carlo method. Appl Radiat Isot 2009; 67:1438-40. [DOI: 10.1016/j.apradiso.2009.02.033] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
43
|
Shirazi A, Mahdavi SR, Sardari D, Sadri L. Portal image contrast enhancement. Rep Pract Oncol Radiother 2006. [DOI: 10.1016/s1507-1367(06)71046-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
|
44
|
Sardari D, Baghini N. Escape probability of 511keV annihilation photons from HPGe detectors. RADIAT MEAS 2005. [DOI: 10.1016/j.radmeas.2004.05.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
45
|
Ay MR, Sarkar S, Shahriari M, Sardari D, Zaidi H. Assessment of different computational models for generation of x-ray spectra in diagnostic radiology and mammography. Med Phys 2005; 32:1660-75. [PMID: 16013725 DOI: 10.1118/1.1906126] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Different computational methods based on empirical or semi-empirical models and sophisticated Monte Carlo calculations have been proposed for prediction of x-ray spectra both in diagnostic radiology and mammography. In this work, the x-ray spectra predicted by various computational models used in the diagnostic radiology and mammography energy range have been assessed by comparison with measured spectra and their effect on the calculation of absorbed dose and effective dose (ED) imparted to the adult ORNL hermaphroditic phantom quantified. This includes empirical models (TASMIP and MASMIP), semi-empirical models (X-rayb&m, X-raytbc, XCOMP, IPEM, Tucker et al., and Blough et al.), and Monte Carlo modeling (EGS4, ITS3.0, and MCNP4C). As part of the comparative assessment, the K x-ray yield, transmission curves, and half value layers (HVLs) have been calculated for the spectra generated with all computational models at different tube voltages. The measured x-ray spectra agreed well with the generated spectra when using X-raytbc and IPEM in diagnostic radiology and mammography energy ranges, respectively. Despite the systematic differences between the simulated and reference spectra for some models, the student's t-test statistical analysis showed there is no statistically significant difference between measured and generated spectra for all computational models investigated in this study. The MCNP4C-based Monte Carlo calculations showed there is no discernable discrepancy in the calculation of absorbed dose and ED in the adult ORNL hermaphroditic phantom when using different computational models for generating the x-ray spectra. Nevertheless, given the limited flexibility of the empirical and semi-empirical models, the spectra obtained through Monte Carlo modeling offer several advantages by providing detailed information about the interactions in the target and filters, which is relevant for the design of new target and filter combinations and optimization of radiological imaging protocols.
Collapse
Affiliation(s)
- M R Ay
- Department of Physics & Nuclear Sciences, AmirKabir University of Technology, Tehran, Iran.
| | | | | | | | | |
Collapse
|
46
|
Abstract
In recent years considerable effort has been devoted to applying pattern recognition techniques to the complex task of data analysis in drug research. Artificial neural networks (ANN) methodology is a modeling method with great ability to adapt to a new situation, or control an unknown system, using data acquired in previous experiments. In this paper, a brief history of ANN and the basic concepts behind the computing, the mathematical and algorithmic formulation of each of the techniques, and their developmental background is presented. Based on the abilities of ANNs in pattern recognition and estimation of system outputs from the known inputs, the neural network can be considered as a tool for molecular data analysis and interpretation. Analysis by neural networks improves the classification accuracy, data quantification and reduces the number of analogues necessary for correct classification of biologically active compounds. Conformational analysis and quantifying the components in mixtures using NMR spectra, aqueous solubility prediction and structure-activity correlation are among the reported applications of ANN as a new modeling method. Ranging from drug design and discovery to structure and dosage form design, the potential pharmaceutical applications of the ANN methodology are significant. In the areas of clinical monitoring, utilization of molecular simulation and design of bioactive structures, ANN would make the study of the status of the health and disease possible and brings their predicted chemotherapeutic response closer to reality.
Collapse
Affiliation(s)
- S Sardari
- Department of Chemistry, University College of Cape Breton, PO Box 5300, Sydney, NS, Canada B1P 6L2.
| | | |
Collapse
|
47
|
|