Paper published in a journal (Scientific congresses and symposiums)
First steps towards online Personal Dosimetry Using Computational Methods in Interventional Radiology: operator’s position tracking and simulation input generation
[en] Interventional radiologists/cardiologists are repeatedly exposed to low radiation doses which makes them the group of the highest occupational exposure and put them at high risk of stochastic effects. Routine monitoring of staff is usually performed by means of passive dosimeters. However, current personal dosimeters are subject to large uncertainties, especially in non-homogeneous fields, like those found in interventional cardiology (IC). Within the PODIUM (Personal Online DosImetry Using computational Methods) research project, a user-friendly tool was developed based on MCNP code to calculate doses to the staff in IC. The application uses both the data of motion tracking system to generate the position of the operator and the data from the Radiation Dose Structure Report (RDSR) from the imaging device to generate time-dependent parameters of the radiation source. The results of the first clinical validation of the system show a difference of about 50% between simulated Hp(10) with MCNP and measured Hp(10) with electronic personal dosimeter worn above the lead apron. [en] Introduction
<br />With this work we present an innovative system for calculating occupational doses, as it is now being developed within the PODIUM (Personal Online DosImetry Using computational Methods) project. Individual monitoring of workers is essential to follow up regulatory dose limits and to apply the ALARA principle. However, current personal dosimeters are subject to large uncertainties, especially in non-homogeneous fields, like those found interventional radiology/cardiology. Workers in these fields also need to wear several dosimeters (extremity, eye lens, above/below apron), which causes practical problems. As the capabilities of computational methods are increasing exponentially, it will become feasible to use pure computations to calculate doses in place of physical dosimeters.
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<br />Methods
<br />In our concept system, operational and protection quantities are calculated by fast Monte Carlo methods. Our dose calculation accounts for the real radiation field (including fluence, energy and angular distributions) and for the relative position of different body parts of the worker. The real movements of exposed workers are captured using depth cameras. This information is translated to a flexible anthropomorphic phantom, and then in Monte-Carlo simulations. For the moment this is done off-line, after the procedure is finished, and the parameters of the procedure are collected.
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<br />Results
<br />For validating our system, we performed tests in interventional radiology (IR) rooms. In total, we followed 15 procedures in Cath-labs at UZ-VUB and CHU- Liège. An accurate analysis of the staff position was performed, and as a first step, we compared simulated Hp(10) and measured Hp(10) with electronic personal dosimeter (EPD) during an angiography procedure for some of these procedures. The results showed good agreement between the calculated doses and the ones measured by the EPD dosimeter.
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<br />Conclusions
<br />With this work, we show that simulating worker doses based on tracking systems and flexible phantoms is possible. This method has big advantages in interventional radiology workplaces where the fields are non-homogeneous and doses to staff can be relatively high. This method can also help in ALARA applications and for education and training.
Disciplines :
Engineering, computing & technology: Multidisciplinary, general & others Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Lombardo, Pasquale; The Belgian Nuclear Research Center > Research in Dosimetric Applications
Vanhavere, Filip
Seret, Alain ; Université de Liège - ULiège > Département de physique > Imagerie médicale expérimentale
Phillips, Christophe ; Université de Liège - ULiège > CRC In vivo Im.-Neuroimaging, data acquisition & processing
Covens, Peter; VUB: Vrije Universiteit Brussel > Medical Physics
Language :
English
Title :
First steps towards online Personal Dosimetry Using Computational Methods in Interventional Radiology: operator’s position tracking and simulation input generation
Publication date :
16 January 2020
Event name :
3rd International Conference on Dosimetry and its Applications (ICDA-3)
Event organizer :
Instituto Superior Técnico – University of Lisbon Center for Nuclear Sciences and Technologies (C2TN)
Event place :
Lisbon, Portugal
Event date :
from 27/05/2019 to 31/05/2019
By request :
Yes
Audience :
International
Journal title :
Radiation Physics and Chemistry
ISSN :
0969-806X
Publisher :
Elsevier, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
H2020 - 662287 - CONCERT - European Joint Programme for the Integration of Radiation Protection Research
Name of the research project :
PODIUM: Personal Online DosImetry Using computational Methods
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