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

摘要

In this study, using methacrylic and ascorbic acid in gelatin initiated by copper (MAGIC-f) polymer gel after megavoltage energyudexposure, the sensitivity of the ultrasound velocity and attenuation coefficient dose-dependent parameters was evaluated. TheudMAGIC-f polymer gel was irradiated under 1.25 MeV cobalt-60, ranging from 0 to 60 Gy in 2-Gy steps, and received doseuduniformity and accuracy of +2%. After calibration of the ultrasonic systems with a frequency of 500 kHz, the parameters ofudultrasound velocity and attenuation coefficient of the irradiated gel samples were measured. According to the dose–responseudcurve, the ability of ultrasonic parameters was evaluated in dose rate readings. Based on a 4-order polynomial curve, fitted on theuddose–response parameters of ultrasound velocity and attenuation coefficient and observed at 24 hours after irradiation, ultrasonicudparameters had more sensitivity. The sensitivity of the dose–velocity and dose-attenuation coefficient curves was observedudas 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, andud25C on the gel dosimeter after 0 to 60 Gy irradiation showed that readings at 25C have higher sensitivity compared to 15C andud5C. Maximum sensitivity time and temperature readings of the MAGIC-f ultrasonic parameters were concluded 24 hours afterudirradiation and at a temperature of 25C.udKeywo