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Strahlenther Onkol. 1992 May;168(5):291-6.

[The surface dosage in the radiotherapy of a small breast carcinoma with 6-MV x-rays. A contribution to quality assurance in radiotherapy].

[Article in German]

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Radiologie II/Strahlentherapie, Städtische Kliniken Darmstadt.


Radiation treatment of breast cancer with high-energy X-rays in breast conserving therapy tends to an under-dosage of the skin region. Results of our measurements with patients and in water demonstrate that the skin receives only 40% of the reference dose applying tangential opposed wedged fields with 6 MV X-rays. Doing so we must accept a dose inhomogeneity of about 60% in the target volume. That may cause an increased recurrence rate especially for superficially situated tumors and/or in the case of intraoperatively disseminated tumor cells. We show that utilizing bolus material of only 5 mm water equivalence on the skin above the tumor bed reduces the dose inhomogeneity to 8%.

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