Sammendrag
In 2D brachytherapy treatment, the lack of spatial information and low visualization of the extent of tumour, applicators in 3D and Organs at Risk (OAR) volumes results in suboptimal application technique planning and insufficient dose coverage to large tumours, which is a limitation at KATH. A water phantom was constructed for measurement of air kerma strength and dose distribution the brachytherapy sources using an ion chamber. Both 2D and 3D imaging modalities, X-ray and CT, were used and compared, including treatment planning procedures of 2D LDR and 3D IGBT. SK (air kerma strength) for the three sources labelled V1, U3 and V5 at 2cm from the applicatorswere 6.839 x 10-12 Gycm2h-1, 2.043 x 10-11 Gycm2h-1 and 4.336 x 10-11 Gycm2h-1 respectively and the dose distribution measured at 2 cm from the fletcher applicators’ left, top, and right directions over a 300-second period were 5.052 x 10-5 Gy, 2.471 x 10-5 Gy, and 6.133 x 10-5 Gy. In conclusion, Image Guided Brachytherapy is observed to high conformal dose coverage at point A or a 2cm distance from the applicators verifying the Manchester point A protocol
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