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The conventional vaginal cylinder design consists of cylindrical segments and a hemi-spherical top, with a diameter matched to the cylinder portion. This design is driven primarily by geometric simplicity, without much consideration for the dose distribution around the brachytherapy source, nor the anatomy of patients. Careful plan optimization is required to make the prescription isodose line conform to the surface of the cylinder. However, the conformity is not optimal due to the discrepancy between the cylinder shape and the intrinsic dose anisotropy of the source perpendicular to the azimuthal plane.
Source: Brachytherapy - Category: Cancer & Oncology Authors: Source Type: research