Search published articles


Showing 2 results for Zabihzadeh
Design of Mercury Shielding System in Megavoltage Radiation Therapy
Mohamad Javad Tahmasebi Birgani, Fatemeh Seif, Mohamad Reza Bayatiani, Mansour Zabihzadeh, Seyed Mohamad Hosseyni,
Volume 16, Issue 8 (11-2013)
Abstract

Background: In this research dosimetric parameters of mercury was investigated as a radiotherapy modulator and compared with cerrobend as a common beam attenuator material in most radiotherapy centers. Also several designs for mercury shielding system were evaluated.

Materials and Methods: In this experimental research transmission factor of different thicknesses of cerrobend and mercury at 6MV and 18MV photon beams was measured in order to investigate mercury as a beam modulator. Relative dosimetry was done with ionization chambers and then mercury modulating system for radiotherapy was designed with different cross sections.

Results: The result show that the transmission values increased with field size increment due to increased scatter contribution, for all cerrobend and mercury thicknesses at two energies. The procedure of mercury transmission factor is in agreement with cerrobend transmission factor. The second designed system with hexagonal cross section is in good agreement with patient contour.

Conclusion: The experimental investigation on mercury dosimetric parameters showed that mercury can be proposed as a modifier in radiotherapy because of its profit properties such as being liquid in room temperature, power of attenuation and …. So mercury can be proposed as a beam modifier (at closed system because of its poison vapor) in radiotherapy. Keywords: beam modifiers, Cerrobend, dosimetry, Mercury


Exploring the Malignant Predisposing Factors in Children Referred to Amir Kabir Hospital in Arak, 2011-2016
Aziz Eghbali, Hasan Taher Ahmadi, Shahla Zabihzadeh, Morteza Mousavi Hasanzadeh,
Volume 22, Issue 3 (8-2019)
Abstract
Background and Aim: Cancer is the second cause of death in children under fourteen years old. The aim of this study was to determine the epidemiology and predisposing factors of childhood cancers.
Materials and Methods: This observational-descriptive study was performed on 82 children in the oncology department of Amir-kabir Hospital in Arak who were referred between 2011 and 2016. Data on age, sex, type of malignancy and predisposing factors were carried out by person interviews or patient records and were registered in checklist and analyzed.
Ethical Considerations: This study with research ethics code IR.ARAKMU.REC.2.46.87 has been approved by research ethics committee at Arak University of Medical Sciences.
Findings: The results showed that 56.1 percentage of patients were aged 0-5 years, 74.1 percentage were urban, 90.2 percentage were alive, 99 percentage were singleton, 92.7 percentage full term, 46.3 percentage of them were the first children and 87.9% of them had birth weight over 2500 g. There was no significant relationship between the delivery method and delivery problems, the sex of the patients, the environmental factors (such as consuming canned food, sausages, insecticide use, drug use during pregnancy and the rate of infectious diseases), However, there was a direct relationship between the increased age of parents and the high socioeconomic level with the risk of cancer.
Conclusion: The risk of childhood cancers in Markazi province is more related to genetic factors and the environmental factors causing cancers in children are less involved in this study.

Page 1 from 1     

© 2025 CC BY-NC 4.0 | Journal of Arak University of Medical Sciences

Designed & Developed by : Yektaweb