Isfahan University of Medical Sciences

Science Communicator Platform

Stay connected! Follow us on X network (Twitter):
Share By
The Effect of Physical Characteristics of Spinal Implants on Spinal Cord Dose Distribution



Alinejad M1 ; Shokrani P1 ; Amouheidari A2 ; Atarod M3
Authors

Source: Journal of Isfahan Medical School Published:2014

Abstract

Background: In radiotherapy, the presence of metallic implants affects the dose distribution, depending on beam energy and type, size, material and position of the implant. In this study, the effect of spinal implants on dose distribution was evaluated by Monte Carlo simulation. Methods: Oncor accelerator and water phantom, Plexiglas phantom containing spine and Plexiglas phantom containing spine and rod implants were simulated using BEAMnrc and DOSXYZnrc user codes and were validated. The effect of the implant presence, its size material, and location on dose distribution was investigated. Findings: Comparison of dose distributions with and without implants showed an increase of 5.5% in dose up to 4 mm from metal surface, due to the back scattering of electrons. Maximum attenuation in titanium rods was 9%. When the rods were positioned closer to each other, an increase in attenuation was observed. However, dose in spine was increased, when the distance between rods and spine was reduced. Rods with smaller cross section had less effect on dose. Attenuation in vitallium and stainless steel implants were 2 times greater than titanium implants. Conclusion: Depending on the location of implant with respect to spine, dose perturbation due to implants can either increase or decrease the dose in spine. The effect of size and material of implant was more important when spine was located under the implant. Generally, the effect of spinal implant on dose distribution is a function of size, material and position of the implant. Therefore, it is recommended to evaluate the dose distribution for such patients individually. © 2014, Isfahan University of Medical Sciences(IUMS). All rights reserved.
Related Docs
View other Related Docs
1. Improvement of Metallic Artifacts in Computed Tomography in the Absence of Artifact Reduction Algorithms for Spinal Treatment Planning Applications, Journal of Cancer Research and Therapeutics (2020)
2. Monte Carlo Simulation and Film Dosimetry for Electron Therapy in Vicinity of a Titanium Mesh, Journal of Applied Clinical Medical Physics (2014)
3. Development and Implementation of a Monte Carlo Frame Work for Evaluation of Patient Specific Out- of - Field Organ Equivalent Dose, International Journal of Radiation Research (2017)
Experts (# of related papers)
View all Related Experts
Mahnaz Roayaei (4)
Daryoush Shahbazi-Gahrouei (2)
Other Related Docs
4. First Macro Monte Carlo Based Commercial Dose Calculation Module for Electron Beam Treatment Planning - New Issues for Clinical Consideration, Physics in Medicine and Biology (2006)
5. Evaluation of Bone Marrow Absorbed Dose of 153Sm-Edtmp and 223Ra-Cl2 in Patients With Bone Metastasis Using Monte Carlo Simulation, Journal of Isfahan Medical School (2021)
6. A Novel Approach in Electron Beam Radiation Therapy of Lips Carcinoma: A Monte Carlo Study, Medical Physics (2013)
7. Feasibility of 18-Mv Grid Therapy From Radiation Protection Aspects: Unwanted Dose and Fatal Cancer Risk Caused by Photoneutrons and Scattered Photons, Computer Methods and Programs in Biomedicine (2022)
8. Chest Dose Assessment in Breast Cancer Therapy Using Two Electron Energies, Journal of Isfahan Medical School (2017)
9. Dose Perturbation Due to Dental Amalgam in the Head and Neck Radiotherapy: A Phantom Study, Medical Dosimetry (2020)
10. Design of a Generally Applicable Abdominal Shield for Reducing Fetal Dose During Radiotherapy of Common Malignancies in Pregnant Patients, Iranian Journal of Radiation Research (2012)
11. Measurement of Imposed Radiation Dose and Normal Tissue Complications Probability to Lung and Heart in Patients With Mastectomy Using Two Common Tangential Radiotherapy Methods of Supraclavicular Nodes, Anterior-Posterior (Ap) and Two Parallel Opposed Fields (Pofs), Journal of Isfahan Medical School (2018)
12. Investigating the Necessity of Adaptive Radiotherapy in Tomotherapy of Head and Neck Cancer Patients, Radiation Oncology (2025)
13. Estimating the Absorbed Doses From 99Mtc-Mdp in Patients Following Bone Scan, Journal of Isfahan Medical School (2015)
14. Ionizing Radiation Protection Principles in Dual Energy X-Ray Absorptiometry- a Review Study; [اصول حفاظت در برابر پرتوهای یونساز در جذب‌سنجی اشعه‌ی ایکس با انرژی دوگانه: یک مطالعه‌ی مروری], Journal of Isfahan Medical School (2024)
15. Evaluation of the Photon Dose Calculation Accuracy in Radiation Therapy of Malignant Pleural Mesothelioma, Journal of Cancer Research and Therapeutics (2018)
16. Estimation of Cell Response in Fractionation Radiotherapy Using Different Methods Derived From Linear Quadratic Model, Radiology and Oncology (2015)
17. Optimization of Treatment Parameters for Post Mastectomy Electron Therapy of Defected Chest-Wall, Journal of Isfahan Medical School (2016)
18. Sensitivity Analysis of a 6 Mev Photon Beam Monte Carlo Model, Journal of Medical Signals and Sensors (2023)
19. Monte Carlo Modeling of Skyshine Dose Distribution in Vicinity of Medical Accelerator Facilities, Journal of Isfahan Medical School (2017)
20. Calculation of Excess Dose to the Eye Phantom Due to a Distanced Shielding for Electron Therapy in Head and Neck Cancers, Journal of Medical Signals and Sensors (2012)