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Volume 13, Number 5, 2008

Dose measurement verifi cation in solid state phantom in place of fi eld connection for non-standard radiotherapy conditions

Marta Gabor, Marcin Litoborski


BACKGROUND: This work describes chosen combinations of therapeutic fi elds during the patient’stotal body irradiation (TBI). The TBI technique requires as large a radiation field as one can achieve [1][2]. That is why the source-skin distance (SSD) is greater than 100 cm (SSD for standard treatment conditions). In such non-standard radiotherapy conditions all the measurements described in this paper were done.
MATERIALS/METHODS: All beam profi les were obtained by irradiating fi lms with 20 MV (nominal energy) photon rays in non-standard conditions of radiotherapy. The method of measurement (film dosimetry) and used materials (self-developing GAFCHROMIC EBT fi lms) are presented in the Material and Method section [3].
AIM: Because in the therapy some areas must receive a greater dose than others, the size of the therapeutic fields must be adjusted. That is why the areas where two fi elds overlap inside the patient’s body differ. The diversity of absorbed dose in these areas was measured and presented in the schemas in the Results section.
RESULTS: The profi les presenting dose distribution in the areas where therapeutic fi elds overlap in most cases show increase of the delivered dose. For the most often used therapeutic fields the increase exceeds 180% of the planned dose in the sector about 2.5 - 10 cm. There were also two cases where the delivered dose was lower than the planned one (about 29 - 86% of the planned dose).
Chosen measurements and combinations of the therapeutic fi elds are discussed in detail and all the results are collected in a table at the end of the section.
CONCLUSIONS: The profi les obtained from the scans of the irradiated GAFCHROMIC EBT films and their digital processing include 0.05 Gy noise. This means that the described method requires a high quality scanner, dedicated to RTG fi lms. The spectrophotometer measurements showed high fi lm dependency on light wavelength. It seems that using a monochromatic source of light may give better results.

Signature: Rep Pract Oncol Radiother, 2008; 13(5) : 247-256

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