Additional investigation is needed to further understand the dosimetric characteristics of FFF mode.ĭosimetry Field size Ionization chambers Linear accelerators Photon scattering Photons.
#BJR SUPPLEMENT 25 FREE DOWNLOAD SERIAL#
Pb, and Betatron Radiation, 22 MeV-Hospital Physicists Association 1953 Index of NLM Serial Titles-National Library of Medicine (U.S. The scatter factors reported in BJR #25 are valid for comparison for 6-MV, 6-MV FFF, and 10-MV. BJR Supplement- 1989 Central Axis Depth Dose Data, for X Radiations of Half Value Layers from 0.01 Mm. We also found that 10-MV FFF showed very similar trend. The agreement ranged from 0.996 to 1.004 and 0.995 to 1.002 for 6-MV and 6-MV FFF, respectively. The NPSF agreement between the 6-MV and 6-MV FFF with the BJR#25 were all within ☐.5%. BRITISH JOURNAL OF RADIOLOGY SUPPLEMENT 25 OPENSE DE. BJR 25 BRITISH JOURNAL OF RADIOLOGY SUPPLEMENT 25. calculated from PDDs using BJR Supplement 25 data for flattened and unflattened photon beams. BRITISH JOURNAL OF RADIOLOGY SUPPLEMENT 25.
accuracy of the British Journal of Radiology Supplement 25 (BJR 25) percentage. Reports of Practical Oncology and Radiotherapy, 25(1), pp. From BJR #25, NPSFs were obtained for comparison with the measurements. Percentage difference in dose between kVDoseCalc, BJR 25, and experimental. For in-air measurements, the chamber was positioned at 100 cm source-to-axis distance with appropriate build-up cap. BJR Supplement 25: Central axis depth dose data for use in radiotherapy (1996).
For measurements in water, the chamber was positioned at 100 cm source-to-axis distance at the depth of dose maximum. Case-25 ( 20×20 cm2, E6 MeV) is for OAD (Zcal5 cm) in Figure 2(b). Both water and in-air measurements were made to obtain NPSFs normalized to the 10 × 10 cm 2 field size. For all measurements, a Scanditronix CC04 ionization chamber was used. The purpose of this work was to determine whether the energy independent NPSFs BJR#25 are valid for comparison with FFF photon beams.Īll measurements were performed using a Varian TrueBeam linear accelerator with photon energies of 6-MV, 6-MV FFF and 10-MV FFF modes. During the commissioning of an accelerator with flattening filter free (FFF) photon beams (Varian True Beam 6 MV FFF and 10 MV FFF) we compared measured Phantom Scatter Factors (Sp) with the Normalized Peak Scatter Factors (NPSFs) from the British Journal of Radiology Supplement 25 (BJR #25). In the process of measuring and validating fundamental dosimetry data prior to the clinical use of a treatment unit, it is prudent to compare measurements with previously published equivalent data.