Ultrasound attenuation computed tomography assessment of PAGAT gel dose

Khoei, Shadi, Trapp, Jamie V., & Langton, Christian M. (2014) Ultrasound attenuation computed tomography assessment of PAGAT gel dose. Physics in Medicine and Biology, 59(15), N129-N137.

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Ultrasound has been previously investigated as an alternative readout method for irradiated polymer gel dosimeters, with authors reporting varying dose responses. We extend previous work utilizing a new computed tomography ultrasound scanner comprising of two identical 5 MHz, 128-element linear-array ultrasound transducers, co-axially aligned and submerged in water as a coupling agent, with rotational of the gel dosimeter between the transducers facilitated by a robotic arm. We have investigated the dose-dependence of both ultrasound bulk attenuation and broadband ultrasound attenuation (BUA) for the PAGAT gel dosimeter. The ultrasound bulk attenuation dose sensitivity was found to be 1.46  ±  0.04 dB m −1 Gy −1, being in agreement with previously published results for PAG and MAGIC gels. BUA was also found to be dose dependent and was measured to be 0.024  ±  0.003 dB MHz −1 Gy −1; the advantage of BUA being its insensitivity to frequency-independent attenuation mechanisms including reflection and refraction, thereby minimizing image reconstruction artefacts.

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ID Code: 88639
Item Type: Journal Article
Refereed: Yes
Keywords: ultrasound computed tomography, broasband ultrasound attenuation, polymer gel dosimetry, ultrasound attenuation
DOI: 10.1088/0031-9155/59/15/N129
ISSN: 0031-9155
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Institute of Physics and Engineering in Medicine
Deposited On: 03 Nov 2015 23:49
Last Modified: 03 Nov 2015 23:49

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