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The Effect of Scanning Orientation On New EBT-XD Film Using Vidar and Epson Scanners

S Chiu-Tsao

S Chiu-Tsao1*, M Chan2 , (1) Quality MediPhys LLC, Denville, NJ, (2) Memorial Sloan-Kettering Cancer Center, Basking Ridge, NJ


SU-F-T-581 (Sunday, July 31, 2016) 3:00 PM - 6:00 PM Room: Exhibit Hall

Purpose:To study the effect of film scanning orientation for new EBT-XD film using Vidar and Epson scanners, compared with EBT3 films.

Methods:The EBT-XD (lot#01081501) and EBT3 films (lot#11031501) were cut into 4cmx7cm pieces and each film piece was uniformly exposed to a 6MV photon beam (15x15cm²) at 5 cm depth and 100cm SAD in polystyrene phantom, one at a time. The doses delivered were 0,2.5,5,10,20,30,40 and 50 Gy for EBT-XD films, and 0,0.5,1,2,4,8,12 and 16 Gy for EBT3 films, respectively. All films were scanned at least 16 hours after irradiation, one at a time, in portrait or landscape orientation, using a Vidar DosimetryPro Advantage Red and an Epson 10000XL scanner (red channel). Each film piece was positioned at the center of a frame (36cmx36cm) with a cutout slightly larger than the film size for scanning. The scanned data (71 dpi), were analyzed using ImageJ and the average in the ROI (3cmx3cm) of each film at the center was obtained.

Results:Dose response curves (netOD vs. dose) were established and compared with EBT-XD and EBT3 film in portrait or landscape orientation using these two scanners. The portrait to landscape (P/L) ratio for each film/scanner combination was determined. The EBT-XD film is about three times less sensitive than EBT3 film. The netOD is higher for portrait than landscape orientation for all the film/scanner combinations. For EBT-XD and EBT3, the average P/L ratios are 1.02 and 1.03 using Vidar scanner, and 1.03 and 1.05 using Epson scanner (red channel), respectively.

Conclusion:The effect of film scanning orientation for new EBT-XD film using Vidar Advantage Red and Epson 10000XL scanners has been studied, in comparison with EBT3 film. The portrait/landscape ratios are the lowest for EBT-XD film using Vidar Advantage Red scanner among the four film/scanner combinations.

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