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Imaging and Dosimetric Consideration for Titanium Prosthesis Implanted within the Irradiated Region by Cobalt-60 Teletherapy Unit

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2018年第2期7卷 160-172页

作者： Vaino Indongo Samuel Nii Adu Tagoe Kwame Kyere cyril schandorf Namibia University of Science and Technology (NUST) Windhoek Namibia Radiotherapy and Nuclear Medicine Centre Korle Bu Teaching Hospital Accra Ghana School of Health and Allied Sciences University of Ghana Accra Ghana

The aim of this research is to observe dose distributions in the vicinity of titanium prosthetic implants during radiotherapy procedures on 60Co teletherapy machine, Prowess Panther treatment planning system (TPS). Data were obtained using a locally fabricated tissue equivalent phantom CT images with titanium prosthesis which was irradiated with 60Co gamma radiation. Prowess TPS (1.25 MeV) estimated less variations. Proximal ends of the metal recorded slight increase in doses as a result of backscatter with dose increment below acceptable tolerance of ±3%. Doses measured decreases on the distal side of the prosthesis at a distance less than dmax from the plate on each beam energy. The depth dose increases marginally after a certain depth level which generally originated from the unperturbed dose due to increase in the electron fluence. The percentage of depth doses decrease with the increase in plate thickness. A reduction in the above trend was also noticed with an increase in beam energy primarily because scattered photons are more forwardly directed. Prowess TPS (convolution superposition algorithm) was found to be better at reducing dose variation when correction for artifact. Manual calculations on blue phantom data agree with results from Prowess. This treatment system is capable of simulating dose around titanium prosthesis as its range of densities, 0.00121 to 2.83, excludes titanium density (rED for titanium is 3.74).

关键词： Phantom Co-60 Dosimetric Imaging Titanium Implant Prosthesis Prowess Panther

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Dosimetric Effects of Thermoplastic Immobilizing Devices on Surface Dose

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2022年第1期11卷 12-21页

作者： Olivia Adu-Poku Eric Kotei Addison cyril schandorf Francis Hasford Stephen Inkoom Joseph Adom Akosah Kingsley Eunice Arthur Linus Owusu-Agyapong Department of Physics Kwame Nkrumah University of Science and Technology Kumasi Ghana Department of Medical Physics Komfo Anokye Teaching Hospital Oncology Directorate Kumasi Ghana Department of Medical Physics Graduate School of Nuclear and Allied Sciences University of Ghana Accra Ghana Radiation Protection Institute Ghana Atomic Energy Commission Accra Ghana

Thermoplastic immobilizing masks have dosimetric effects on the patient’s skin dose. The thermoplastic percentage depth dose (PDD), equivalent thickness of water for the masks and surface doses were determined. The surface dose factors due to the thermoplastic mask was found to be 1.7949, 1.9456, 2.0563, 2.1967, 2.3827, 2.5459 and 2.6565 for field sizes of 5 × 5, 8 × 8, 10 × 10, 12 × 12, 15 × 15, 18 × 18 and 20 × 20 cm2 respectively which shifted the percentage depth dose curve to lower values. The physical thermoplastic thickness was measured to be between 2.30 and 1.80 mm, and the equivalent thicknesses of water, de, were determined to be between 1.2 and 1.00 mm. This meant that, as the mask thickness decreased, its water equivalent thickness also decreased. The presence of the mask material increased the skin dose to a factor of 1%. The thermoplastic mask factor was also found to be 0.99.

关键词： Thermoplastic Mask Percentage Depth Dose Equivalent Thickness of Water Skin Dose

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