A parametric study of occupational radiation dose in interventional radiology by Monte-Carlo simulations

Abdelrahman, Mahmoud Eid Mahmoud; Lombardo, Pasquale; Camp, Anna; Duch, M.A.; Phillips, Christophe; Seret, Alain; Vanhavere, F.

doi:10.1016/j.ejmp.2020.08.016

Cited by 12 publications

(6 citation statements)

References 24 publications

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“…The conditions investigated in this study were not as comprehensive as those investigated in some relevant parametric studies (Koukorava et al, 2011a; Abdelrahman et al 2020). Numerous combinations of conditions or parameters account for various clinical situations in interventional radiology.…”

Section: Resultsmentioning

confidence: 99%

“…In clinical practice, radiation doses to operators involved in interventional radiological procedures may vary considerably (Martin 2009; Kim et al 2012). The factors that influence the doses to operators include, among others, source characteristics, irradiation configurations, operator position and posture, the use of external or personal protective equipment, and the surrounding environment (Koukorava et al, 2011a; Abdelrahman et al 2020). Understanding the influences of these parameters is essential for the occupational dose optimization and ALARA implementation.…”

Section: Introductionmentioning

confidence: 99%

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Ratios of Eye Lens and Hand Equivalent Doses with Whole-Body Effective Doses for Operators Performing Interventional Radiological Procedures

2022

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Estimating radiation doses for operators performing interventional radiological procedures is crucial in the occupational radiation protection of medical staff. In this study, Monte Carlo simulations coupled with an anthropomorphic phantom were used to model various exposure scenarios during the procedures. Conversion coefficients of the dose-area product of x rays for the eye lens equivalent dose, hand equivalent dose, and whole-body effective dose of the operator were calculated. Accordingly, the relationships between these dose quantities in typical interventional configurations were established, considering various source locations, tube voltages, and use of protective equipment or not. The results are presented in a systematic way for easy comparison and use. Tables and figures of the data can be helpful to provide estimates of eye lens and hand equivalent doses when records of specific dosimeters are absent, such as in the retrospective assessment of operators’ eye lens and hand equivalent doses in past practices.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ratios of Eye Lens and Hand Equivalent Doses with Whole-Body Effective Doses for Operators Performing Interventional Radiological Procedures

2022

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“…An MC framework based on MCNPX v2.7 [10] was used in this study and is described in [11]. This framework consists of software, namely the Interactive Source Simulator, that was developed to automate the generation and initialisation of MC simulations of IR setups.…”

Section: Methodsmentioning

confidence: 99%

Impact of the implementation of the new radiation quantities recommended by ICRU/ICRP for practical use in interventional radiology: a Monte Carlo study

Abdelrahman¹,

Lombardo²,

Dabin³

et al. 2023

J. Radiol. Prot.

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The International Commission on Radiation Units and Measurements (ICRU) proposed a new set of operational quantities for radiation protection for external radiation in its Report Committee 26. The new proposal aims to improve the coherence between the operational quantities and the definitions of the protection quantities in the recommendations of the International Commission on Radiological Protection (ICRP) in 2007. It is expected that this change in operational quantities will impact current dosimeter designs. Although for many photon energies, the conversion coefficients from physical field quantities to the new operational quantities will change relatively little, for radiation fields with low energy photon components, such as medical X-ray applications, there will be a significant decrease in the values of the conversion coefficients. This means that the numerical values of the new operational quantities will be much lower for the same radiation field. These values will be closer to the effective dose, but this change can still cause confusion for the workers. It is important to examine the effect of the new set of dose conversion coefficients on the personal dose in realistic radiation fields. We performed a study to assess the effect of changing the definition of the operational quantity, personal dose equivalent (Hp), in realistic radiation fields in IR workplaces. The X-ray tube Kilovoltage peak (kVp) in IR ranges between 60 and 120 kV. The medical staff is exposed to the scattered photons that have a wide range of energies depending on the beam configuration and the patient size. The objective of this study is to “quantitatively” estimate the impact of implementing the new ICRU quantities of Report 95 in IR radiation fields using Monte-Carlo simulations. Simulations of 560 different configurations in IR were performed using MCNPX to calculate fluence binned per energy and angle of incidence. Hp and Hp(10) were then calculated for each configuration using dose conversion coefficients from fluence given by ICRU Report 95 and 57, respectively. The results show that the mean of the ratio, Hp(10)/Hp, is 1.6 for all simulated scenarios. This reduction will correct the current overestimation of the effective dose and should result in better compliance with the dose limits in IR. However, it may also have negative consequences on the safety culture among the medical staff. Special care will be needed when interpreting these lower doses.

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“…The system uses the concept of 'skeleton' tracking to accurately predict the 3D positions of body joints in real-time. This is then combined with information on the radiation source and Monte-Carlo (MC) simulation codes to calculate occupational radiation doses [17,18]. Some previous studies using MC simulation to evaluate the doctor's dose in Interventional Radiology are available in the literature [19,20], including work published by the European Radiation Dosimetry (EURADOS) group [21][22][23].…”

Section: Background To This Studymentioning

confidence: 99%

Feasibility study of computational occupational dosimetry: evaluating a proof-of-concept in an endovascular and interventional cardiology setting

et al. 2022

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Individual monitoring of radiation workers is essential to ensure compliance with legal dose limits and to ensure that doses are As Low As Reasonably Achievable (ALARA). However, large uncertainties still exist in personal dosimetry and there are issues with compliance and incorrect wearing of dosimeters. The objective of the PODIUM (Personal Online Dosimetry Using Computational Methods) project was to improve personal dosimetry by an innovative approach: development of an online dosimetry application based on computer simulations without physical dosimeters. Occupational doses were calculated based on camera tracking devices, flexible individualized phantoms and data from the radiation source. When combined with fast Monte Carlo simulation codes, the aim was to perform personal dosimetry in real-time. A key component of the project was to assess and validate the methodology in interventional radiology workplaces where improvements in dosimetry are needed. This paper describes the feasibility of implementing the PODIUM approach in a clinical setting. Validation was carried out using dosimeters worn by Vascular Surgeons and Interventional Cardiologists during patient procedures at a hospital in Ireland. Our preliminary results show acceptable differences of the order of 40% between calculated and measured staff doses, however there is a greater deviation for more complex cases and improvements are needed. The challenges of using the system in busy interventional rooms have informed the future needs of PODIUM. The availability of an online personal dosimetry application has the potential to overcome problems associated with current dosimeters. In addition, it should increase awareness of radiation protection among staff. Some limitations remain and a second phase of development would be required to bring the PODIUM method into operation in a hospital setting. However, an early prototype system has been tested in a clinical setting and the results from this two-year proof-of-concept PODIUM project are promising for future development.

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A parametric study of occupational radiation dose in interventional radiology by Monte-Carlo simulations

Cited by 12 publications

References 24 publications

Ratios of Eye Lens and Hand Equivalent Doses with Whole-Body Effective Doses for Operators Performing Interventional Radiological Procedures

Ratios of Eye Lens and Hand Equivalent Doses with Whole-Body Effective Doses for Operators Performing Interventional Radiological Procedures

Impact of the implementation of the new radiation quantities recommended by ICRU/ICRP for practical use in interventional radiology: a Monte Carlo study

Feasibility study of computational occupational dosimetry: evaluating a proof-of-concept in an endovascular and interventional cardiology setting

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