The results found in this study indicate that the BJR Supplement 25 data should not be used for field sizes larger than 20 cm × 20 cm at depths greater than 15 cm for the 6 MV FFF beam. The most recent supplement is numbered 25 and has been brought out. The disagreement between the measured and calculated TMR plots for the 6 MV FFF beam increased with depth and field size to a maximum of 1.7% for a 40 cm × 40 cm field. Scientific community has depended on the BJR Supplements on central axis depth dose data. The TMR plots calculated from PDD were within 1% for the 10 MV and 6 MV flattened beams, for field sizes 3 cm × 3 cm to 40 cm × 40 cm inclusive, at depths measured beyond the depth of maximum dose.
Bjr supplement 25 pdf#
The BJR Supplement 25 data was used to convert the measured PDDs to TMRs and these were compared with the directly measured TMR data. Download File PDF British Journal Of Radiology Supplement 25 The British Journal of Radiology - BIR Publications BJR is an international, multi-disciplinary journal covering the clinical and technical aspects of medical imaging, radiotherapy, oncology, medical physics, radiobiology and the underpinning sciences. PDD and TMR scans for a variety of field sizes were measured in water using a Sun Nuclear Corporation 3D SCANNER™ on a Varian TrueBeam linear accelerator in 6 MV, 10 MV and 6 MV FFF beams.
Bjr supplement 25 free#
This study assessed the validity of the conversion from percentage depth dose (PDD) to tissue maximum ratio (TMR) using BJR Supplement 25 data for flattened and flattening filter free (FFF) beams.
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