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Evaluation of GafChromic EBT prototype B for external beam dose verification
Author(s) -
Todorovic M.,
Fischer M.,
Cremers F.,
Thom E.,
Schmidt R.
Publication year - 2006
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.2188077
Subject(s) - calibration , scanner , materials science , beam (structure) , sensitivity (control systems) , dosimetry , range (aeronautics) , optics , calibration curve , nuclear medicine , physics , medicine , electronic engineering , engineering , mathematics , detection limit , statistics , quantum mechanics , composite material
The capability of the new GafChromic EBT prototype B for external beam dose verification is investigated in this paper. First the general characteristics of this film (dose response, postirradiation coloration, influence of calibration field size) were derived using a flat‐bed scanner. In the dose range from 0.1 to 8 Gy , the sensitivity of the EBT prototype B film is ten times higher than the response of the GafChromic HS, which so far was the GafChromic film with the highest sensitivity. Compared with the Kodak EDR2 film, the response of the EBT is higher by a factor of 3 in the dose range from 0.1 to 8 Gy . The GafChromic EBT almost does not show a temporal growth of the optical density and there is no influence of the chosen calibration field size on the dose response curve obtained from this data. A MatLab program was written to evaluate the two‐dimensional dose distributions from treatment planning systems and GafChromic EBT film measurements. Verification of external beam therapy (SRT, IMRT) using the above‐mentioned approach resulted in very small differences between the planned and the applied dose. The GafChromic EBT prototype B together with the flat‐bed scanner and MatLab is a successful approach for making the advantages of the GafChromic films applicable for verification of external beam therapy.