Digital holographic interferometry for measuring the absorbed three-dimensional dose distribution
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Digital holographic interferometry for measuring the absorbed three-dimensional dose distribution Mohammad Reza Rashidian Vaziri1,a , Amir Mohammad Beigzadeh2 , Farhood Ziaie2 , Mehrdad Yarahmadi3 1 Photonics and Quantum Technology Research School, Nuclear Science and Technology Research Institute,
Tehran, Iran
2 Radiation Application Research School, Nuclear Science and Technology Research Institute, Tehran, Iran 3 Department of Physics, Iran University of Science and Technology, Tehran, Iran
Received: 31 December 2019 / Accepted: 12 May 2020 © Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Ionizing radiations are being widely used in a variety of medical and industrial applications in which the exact determination of the absorbed dose distribution is of crucial importance. Digital holographic interferometry (DHI) is an optical technique that uses lasers to produce fringe patterns which must be reconstructed to measure the physical quantities of interest. The DHI technique is sensitive to noise that makes it difficult to adopt this technique for practically measuring the absorbed dose. In this paper, a new approach to DHI has been developed based on using fringe contouring, polynomial phase fitting and inverse Abel transformation, to reconstruct the three-dimensional dose distribution in noisy conditions. In order to assess the feasibility of this approach in measuring the absorbed dose distributions in noisy conditions, the whole approach is modeled for high energy electrons. It is shown that the three-dimensional dose distribution inside the absorbing medium can be obtained with good accuracy even in the presence of considerable amounts of deliberately added noise to the holograms.
1 Introduction High-intensity pulsed radiation electron or photon sources are being widely used in applied radiation research and in fields like radiation chemistry, materials testing, food technology, radiation biology, etc. [1]. The physical quantity that is most commonly used to quantify the radiation effects in a system is the absorbed dose. The absorbed dose due to energy deposition by ionizing radiation must be measured or calculated three-dimensionally to be able to correctly evaluate the radiation effects on a given system [2]. The main dosimetry techniques that are currently used at standards laboratories to evaluate the quantity of absorbed dose involve ionization chambers and calorimetry systems [3]. Calorimetry is the most direct method of realizing the quantity absorbed dose, since the radiation deposits its energy as heat in the media and proportionally increases the temperature according to their specific heat capacities [4]. Water and graphite calorimeters are generally being used as the reference standard dosimeters to establish the absorbed dose in radiation therapy facilities [5].
a e-mail: [email protected] (corresponding author)
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