Abstract
A novel IMRT phantom was designed and fabricated using Acrylonitrile Butadiene Styrene (ABS) plastic. Physical properties of ABS plastic related to radiation interaction and dosimetry were compared with commonly available phantom materials for dose measurements in radiotherapy. The ABS IMRT phantom has provisions to hold various types of detectors such as ion chambers, radiographic/radiochromic films, TLDs, MOSFETs, and gel dosimeters. The measurements related to pretreatment dose verification in IMRT of carcinoma prostate were carried out using ABS and Scanditronix‐Wellhofer RW3 IMRT phantoms for five different cases. Point dose data were acquired using ionization chamber and TLD discs, while Gafchromic EBT and radiographic EDR2 films were used for generating 2D dose distributions. Treatment planning system (TPS) calculated and measured doses in ABS plastic and RW3 IMRT phantom were in agreement within ± 2%. The dose values at a point in a given patient acquired using ABS and RW3 phantoms were found comparable within 1%. Fluence maps and dose distributions of these patients generated by TPS and measured in ABS IMRT phantom were also found comparable both numerically and spatially. This study indicates that ABS plastic IMRT phantom is a tissue‐equivalent phantom and, dosimetrically, it is similar to solid/plastic water IMRT phantoms. Although this material is demonstrated for IMRT dose verification, it can also be used as a tissue‐equivalent phantom material for other dosimetry purposes in radiotherapy.PACS number: 87.53Kn, 87.55Qr, 87.53Bn and 87.55Km
Highlights
25 Kumar et al Acrylonitrile Butadiene Styrene (ABS)-based low cost IMRT phantom a suitable IMRT phantom be used for dosimetric verification.[13,14] Pretreatment verification of IMRT fields, requires the use of a dedicated tissue-equivalent IMRT phantom with the provision of holding different types of detectors such as ionization chambers, TLDs, radiographic/radiochromic films, gel dosimeters, MOSFETs, and semiconductor diodes.Anumber of IMRT phantoms with the facility for holding different types of detectors are available commercially for this purpose.[15,16,17,18] The majority of these phantoms are made up of solid/plastic water material
This paper describes the design features of an ABS plastic IMRT phantom and the measurement results of pretreatment dose verification
A survey of data in this Table indicates that Treatment planning system (TPS) calculated and ionization chamber measured dose values at corresponding points in Scanditronix-Wellhofer IMRT RW3 phantom and ABS plastic phantom agree within 2% for all the five cases
Summary
25 Kumar et al ABS-based low cost IMRT phantom a suitable IMRT phantom be used for dosimetric verification.[13,14] Pretreatment verification of IMRT fields, requires the use of a dedicated tissue-equivalent IMRT phantom with the provision of holding different types of detectors such as ionization chambers, TLDs, radiographic/radiochromic films, gel dosimeters, MOSFETs, and semiconductor diodes.Anumber of IMRT phantoms with the facility for holding different types of detectors are available commercially for this purpose.[15,16,17,18] The majority of these phantoms are made up of solid/plastic water material. In the case of a photon beam, total attenuation coefficient; in the case of an electron beam, stopping power of the material should be comparable with tissue at the given energy of radiation.[19] Acrylonitrile Butadiene Styrene (ABS) plastic was used as tissueequivalent material for fabrication of the IMRT phantom. This ABS plastic phantom was used for the pretreatment dose verification measurement in IMRT using ionization chamber, TLDs, radiochromic and radiographic film to demonstrate its suitability. This paper describes the design features of an ABS plastic IMRT phantom and the measurement results of pretreatment dose verification
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