Determine the Dose Distribution Using Ultrasound Parameters in MAGIC-f Polymer Gels

Bakhshandeh, Mohsen. and Arbabi, Azim. and Mokhtari-Dizaji, Manijhe. and Masoumi, Hossein. (2016) Determine the Dose Distribution Using Ultrasound Parameters in MAGIC-f Polymer Gels. Dose-Response, 14 (1).

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Abstract

In this study, using methacrylic and ascorbic acid in gelatin initiated by copper (MAGIC-f) polymer gel after megavoltage energy exposure, the sensitivity of the ultrasound velocity and attenuation coefficient dose-dependent parameters was evaluated. The MAGIC-f polymer gel was irradiated under 1.25 MeV cobalt-60, ranging from 0 to 60 Gy in 2-Gy steps, and received dose uniformity and accuracy of +2%. After calibration of the ultrasonic systems with a frequency of 500 kHz, the parameters of ultrasound velocity and attenuation coefficient of the irradiated gel samples were measured. According to the dose–response curve, the ability of ultrasonic parameters was evaluated in dose rate readings. Based on a 4-order polynomial curve, fitted on the dose–response parameters of ultrasound velocity and attenuation coefficient and observed at 24 hours after irradiation, ultrasonic parameters had more sensitivity. The sensitivity of the dose–velocity and dose-attenuation coefficient curves was observed as 50 m/s/Gy and 0.06 dB/MHz/Gy over the linear range of 4 to 44 Gy, respectively. The ultrasonic parameters at 5C, 15C, and 25C on the gel dosimeter after 0 to 60 Gy irradiation showed that readings at 25C have higher sensitivity compared to 15C and 5C. Maximum sensitivity time and temperature readings of the MAGIC-f ultrasonic parameters were concluded 24 hours after irradiation and at a temperature of 25C. Keywo

Item Type: Article
Uncontrolled Keywords: polymer gel, MAGIC-f, radiation dosimetry, velocity, attenuation coefficient
Subjects: WN Radiology . Diagnostic Imaging
QT physiology > physics.mathematics.engineering
Divisions: Faculty of Paramedical
Depositing User: Users 1 not found.
Date Deposited: 17 Oct 2017 05:28
Last Modified: 29 Jan 2018 06:13
URI: http://eprints.skums.ac.ir/id/eprint/5991

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