[The surface dosage in the radiotherapy of a small breast carcinoma with 6-MV x-rays. A contribution to quality assurance in radiotherapy].
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%.
Müller-Sievers
K
K
Radiologie II/Strahlentherapie, Städtische Kliniken Darmstadt.
Kober
B
B
Semrau
C
C
D001943:Breast Neoplasms / Q000532:radiotherapy*; D002277:Carcinoma / Q000532:radiotherapy*; D005260:Female; D006801:Humans; D008961:Models, Structural; D011785:Quality Assurance, Health Care; D011879:Radiotherapy Dosage; D011882:Radiotherapy, High-Energy / Q000592:standards; D012867:Skin / Q000528:radiation effects*; D013499:Surface Properties
Oberflächendosis bei Strahlentherapie des kleinen Mammakarzinoms mit 6-MV-Röntgenstrahlen. Ein Beitrag zur Qualitätssicherung in der Strahlentherapie.