Abstract
For a photon field of size 20x20cm in a telecobalt machine with ‘Source Diaphragm Distance (SDD)’ of 45 cm, DWTC is designed to provide compensation at ‘source skin distance (SSD)’ of 80 cm. A jig stand with 3 acrylic perforated sheets kept together at specified gaps allow required radial divergence of the metal spokes on equally spaced grid. Dose compensator could be fabricated by a tray mounted on the top side of the jig, using molten dental wax by measuring patient anatomy created by a positive of ‘Plaster of Paris’ (POP).
Highlights
External Beam Radiotherapy (EBRT) remains the mainstay for radical treatments, for malignancies in head and neck regions
This study has systematically presented the clinical implementation of a wax-compensator based radiotherapy treatments at our center
For the quality assurance aspect we have shown regular objects like wedges and semispherical shapes checked with water phantom and film dosimetry
Summary
External Beam Radiotherapy (EBRT) remains the mainstay for radical treatments, for malignancies in head and neck regions. Inter-field thickness variations and irregular contour variations are encountered in these patients affecting uniformity in radiation dose delivery. Adverse reactions are encountered because of skewed isodose curves seriously affecting the volume dose variations in treatment planning. This complex situation results in dose inhomogeneity resulting in painful reactions in the head and neck region often discouraging the patient from taking full course of treatment. There are issues relating to adjuvant surgical management when the texture integrity of skin in neck region is not preserved. Nonuniformity of dose in the planned treatment volumes ad-
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