PMC6243336_01
The CT-based plan of three-dimensional conformal radiotherapy using a linear accelerator with 18 MV photon beam. The treatment of T7 was performed using two oblique posterior-anterior fields (a) while the treatment for T10-T12 was performed using a direct posteroanterior field (b). The target volume was contoured by the red line in (a) and orange line in (b). The red and yellow isodoses encompass the area covered by 90% and 80% of the prescribed dose, respectively.
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Two different 3D conformal RT techniques were used: an isocentre technique with two oblique wedge pair fields for the T7 lesion and a direct skin-source distance posteroanterior field for the T10-T12 vertebrae using an 18 MV linear accelerator (Figure 1).
T10-T12 in-field radiation-related acute skin toxicity.
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T10-12 level, both on the back and the abdominal region (Figure 2). This acute side effect was classified as Grade 2 radiodermatitis [according to the Common Terminology Criteria for Adverse Events (CTCAE) version 4.0].
Dose volume histogram. The purple line represents the absorbed dose by the subcutaneous tissues of the T10-T12 field. The orange line represents the absorbed dose by the subcutaneous tissues of the T7 field.
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In particular, the mean doses, V10, V15 and V20 (volume that absorbed 10, 15 and 20 Gy, respectively) were 78 and 33 cm3, 65 and 12 cm3 and 13 and 7 cm3, respectively, for T10-T12 and T7 (Figure 3).