Abstract
In this work we used a 3D quantitative CT ultrasound imaging system to characterise polymer gel dosimeters. The system comprised of two identical 5 MHz 128 element phased-array ultrasound transducers co-axially aligned and submerged in water as a coupling agent. Rotational and translational movement of the gel dosimeter sample between the transducers were performed using a robotic arm. Ultrasound signals were generated and received using an Olympus Omniscan unit. Dose sensitivity of attenuation and time of flight ultrasonic parameters were assessed using this system.
Highlights
Recent years have seen the development of gel dosimetry for radiotherapy purposes
PAGAT gel preparation and irradiation A batch of PAGAT gel was manufactured based on the Venning et al [10] formulation with the THPC (Tetrakis Hyydroxymethyl Phosphonium Chloride) concentration increased to 8 mM [11] under normal atmospheric conditions
Ring artefacts associated with computed tomography (CT) can be seen in the reconstructed images
Summary
The physical properties of these radiosensitive gels undergo changes which can be measured using various medical imaging equipment [1,2,3,4,5,6,7,8,9]. This imaging has utilised either optical computed tomography (CT) [1, 2] magnetic resonance imaging [3,4,5] or x-ray CT [6, 7]. The sensitivity response was investigated through measuring ultrasound attenuation coefficients and ultrasound time of flight in irradiated PAGAT gel [10, 11] dosimeters
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