Abstract
This work presents the first tests performed with radiochromic films and a new Micro‒Opto‒Electro-Mechanical system (MOEMS) for in situ dosimetry evaluation in radiotherapy in real time. We present a new device and methodology that overcomes the traditional limitation of time-delay in radiochromic film analysis by turning a passive detector into an active sensor. The proposed system consists mainly of an optical sensor based on light emitting diodes and photodetectors controlled by both customized electronic circuit and graphical user interface, which enables optical measurements directly. We show the first trials performed in a low‒energy proton cyclotron with this MOEMS by using gafchromic EBT3 films. Results show the feasibility of using this system for in situ dose evaluations. Further adaptation is ongoing to develop a full real‒time active detector by integrating MOEM multi‒arrays and films in flexible printed circuits. Hence, we point to improve the clinical application of radiochromic films with the aim to optimize radiotherapy treatment verifications.
Highlights
This work presents the first tests performed with radiochromic films and a new Micro‒Opto‒ElectroMechanical system (MOEMS) for in situ dosimetry evaluation in radiotherapy in real time
We present the first experimental tests performed in a proton cyclotron with this Micro-Opto-Electro-Mechanical system (MOEMS) by using gafchromic EBT3 films, which belong to the film model widely used in particle therapy for external beam therapy[31]
Measurements were performed with two different methods: first, with the new approach based on the optical sensing system, films were put individually within the MOEMS to assess the voltage generated by it
Summary
This work presents the first tests performed with radiochromic films and a new Micro‒Opto‒ElectroMechanical system (MOEMS) for in situ dosimetry evaluation in radiotherapy in real time. Radiochromic films are solid state detectors that have been traditionally considered the basic 2D passive detectors in the area for dose verification from tens of mGy to hundreds of Gy for diagnostic instrumentation, e.g. X‒ray radiography, computer tomography, mammography, i.a., and determination of depth‒dose profiles in photon, electron and ion beams Due to their high spatial resolution, low energy dependence, and quasi water‒equivalence, they are widely used for quality assurance (QA) measurements and treatment verification[1,2,3,4,5,6]. When it is mandatory to provide a dose verification in real time, the films are complemented with active radiation sensors as semiconductor or scintillation detectors, gas chambers, i.a.19–22 In response to these issues, we aimed at creating a novel device by using another physical parameter as well as a new method to obtain the dose derived from an innovative Micro-Opto-Electro-Mechanical system (MOEMS)[23,24,25,26,27]. To the best of our knowledge, this is the first MOEMS to overcome the traditional limitation of time‒delay in gafchromic film analysis by turning a passive detector into a potential active sensing system in radiotherapy
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