Abstract
Total-skin electron beam (TSEB) irradiation is used to deliver a homogeneous dose distribution over the entire skin surface of a patient. TSEB dosimetry is quite complex as to the evaluation and measurement of absorbed dosage in the cutaneous region. This paper evaluates the performance of different dosimetric materials, using TL and OSL dosimetry, in the extremity-dose assessment of TSEB treatments using the six-dual-field technique and an anthropomorphic phantom. Dosimeters were selected with repeatability better than [Formula: see text] and calibrated to 6-MeV electron-beam dosimetry. Measurements were conducted in the abdominal region as a reference point and on the extremities. Results show expected deviations ranging up to [Formula: see text] in the dose received in the extremities and good results in dose assessment using all dosimetric materials tested.
Highlights
One of the modalities of external radiation therapy is total-skin electron beam (TSEB) irradiation for delivering a homogeneous dose distribution over the entire skin surface of the patient
This paper evaluates the performance of different dosimetric materials using TL and optically stimulated luminescence (OSL) dosimetry in the extremity-dose assessment of TSEB treatments, using the six-dual-field technique and an anthropomorphic phantom
The repeatability-test measurements were performed with a 4π geometry 137Cs gamma irradiator, in air and in electronic-equilibrium conditions, placing the pellets between two 0.3 cm thick poly(methyl methacrylate) (PMMA) plates
Summary
One of the modalities of external radiation therapy is total-skin electron beam (TSEB) irradiation for delivering a homogeneous dose distribution over the entire skin surface of the patient. The Hospital Israelita Albert Einstein follows the six-dual-field technique ( known as the Stanford technique) for the commissioning of TSEB treatments, as reported in Ref. 2 by the American Association of Physics in Medicine (AAPM). In this method, dual fields are created by varying the gantry rotation of the linear accelerator ±17° over the horizontal plane with reference to the waistline of the patient, creating a very large field over distance. The dual fields minimize x-ray contamination of the central axis and nonuniformity owing to the inverse-square-of-the distance law.[2]
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