Abstract
Thermoplastic immobilizing masks have dosimetric effects on the patient’s skin dose. The thermoplastic percentage depth dose (PDD), equivalent thickness of water for the masks and surface doses were determined. The surface dose factors due to the thermoplastic mask was found to be 1.7949, 1.9456, 2.0563, 2.1967, 2.3827, 2.5459 and 2.6565 for field sizes of 5 × 5, 8 × 8, 10 × 10, 12 × 12, 15 × 15, 18 × 18 and 20 × 20 cm2 respectively which shifted the percentage depth dose curve to lower values. The physical thermoplastic thickness was measured to be between 2.30 and 1.80 mm, and the equivalent thicknesses of water, de, were determined to be between 1.2 and 1.00 mm. This meant that, as the mask thickness decreased, its water equivalent thickness also decreased. The presence of the mask material increased the skin dose to a factor of 1%. The thermoplastic mask factor was also found to be 0.99.
Highlights
Thermoplastics are organic materials which are ductile in nature
The use of thermoplastics for immobilization during treatment of patients can be analyzed on the basis of Percentage Depth Dose (PDD) effect, equivalent thickness of water for the thermoplastic used and surface dose effect on the patient
The presence of the mask material shifted the position of the percentage depth dose (PDD) curve towards maximum PDD value of 2.7% by an amount equal to the equivalent thickness of solid water of 1.2 mm that the mask represented
Summary
Thermoplastics are organic materials which are ductile in nature. They can be formed after softening and retain their final shape when cooled. The chemistry of thermoplastics is comparable to that of rubber, while the strength is similar to aluminium. They are light in weight with densities ranging from 0.9 to 2 g/cm. They are light in weight with densities ranging from 0.9 to 2 g/cm3 These properties, along with their low cost make them appropriate for several.
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More From: International Journal of Medical Physics, Clinical Engineering and Radiation Oncology
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