EBT3 radiochromic film was calibrated from 3.0-7.0 Gy in 0.5 Gy intervals using 3 shots at each calibration dose, using the same SARRP 10x10 mm2 aperture. These films were then scanned on an Epson 11000XL flatbed scanner at least 24 hours post-irradiation with no software corrections. The three red channel measurements were averaged for each calibration point, and the resulting curve was fit to a 3rd order polynomial.
11000xl flatbed scanner
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3 protocols using 11000xl flatbed scanner
1
EBT3 Radiochromic Film Calibration
2
Dosimetry using GAFCHROMIC EBT3 Films
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Measurements with GAFCHROMIC EBT3 were positioned perpendicular to the beam axis in a solid water equivalent phantom of 30 × 30 × 30 cm. Films were cut into squares of 5 cm on each side, 24 h before irradiation. The upper right corner was marked at the time the film was cut to define its orientation. Since the relation between pixel value and absorbed dose is non‐linear, a calibration dose is necessary. The calibration of EBT3 films is performed by doing eight expositions to a 6‐MV beam for a dose range [0–500 cGy]. For stabilization of the films response, 48 h standby times were observed. Films for calibration and analyze were scanned with Epson 11000XL flatbed scanner in transmission mode with a resolution of 150 dpi and 48‐bit RGB format. Exploitation of the films was performed with Film QA Pro software (Ashland) including multichannel correction.10 The red color channel was used to calculate the absorbed dose on EBT3 films.
3
Radiation Delivery Accuracy Evaluation
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To assess for radiation delivery accuracy, mouse-like phantom analysis were performed, as previously described in Welch et al. [21 (link),22 ]. One mouse like phantom is in the sagittal arrangement, and a second is in the coronal arrangement. Radiochromic film, EBT3 (Ashland Advanced Materials, Niagara Falls, NY), was placed at the center of the tumor region in both the coronal and the sagittal phantoms. After calibration of the radiochromic films, absolute dose distributions of irradiated films were analyzed based on the optical density distribution and H-D curve. Doses of 8 Gy were delivered to both the sagittal and the axial phantom, and radiochromic films were analyzed. The radiochromic film was scanned within 12 h of delivery of radiation using an Epson Expression (Long Beach, CA) 11000XL flatbed scanner with professional mode, positive film type, transparency mode, and no color correction settings. The irradiated films were scanned at 300dpi resolution.
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