Linac mechanic QA using a cylindrical phantom

Physics in Medicine and Biology
Maria Mamalui-HunterDaniel A Low

Abstract

Precise mechanical operation of a linear accelerator (linac) is critical for accurate radiation therapy dose delivery. Quantitative procedures for linac mechanical quality assurance (QA) used in the standard of care are time consuming and therefore conducted on a relatively infrequent basis. We present a method for evaluating the mechanical performance of a linac based on a series of projection portal images of a prototype cylindrical phantom with embedded radiopaque fiducial markers. The marker autodetection process included modeling imager response to the radiation beam where the projected cylinder attenuation yielded a non-uniform image background. The linac mechanical characteristics were estimated based on nonlinear multi-objective optimization of the projected marker locations. The estimated geometry parameters for the tested commercial model were gantry angle deviation 0.075 +/- 0.076 degrees (1 SD), gantry sag 0.026 +/- 0.02 degrees , source-to-axis distance SAD 998.3 +/- 1.7 mm, source-to-detector distance SDD 1493 +/- 5.0 mm, couch vertical motion 0.6 +/- 0.45 mm, couch rotation 0.154 +/- 0.1 degrees and average linac rotation center (1.02, -0.27, -0.37) +/- (0.36,0.333,1.20) mm relative to the laser intersection. The...Continue Reading

References

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Citations

Feb 11, 2012·Medical Physics·Pejman RowshanfarzadPeter B Greer
Aug 10, 2013·Medical Physics·Henry C WoodruffPeter B Greer
Nov 18, 2011·Journal of Applied Clinical Medical Physics·Pejman RowshanfarzadPeter B Greer
Nov 15, 2012·Journal of Applied Clinical Medical Physics·Pejman RowshanfarzadPeter B Greer
Sep 23, 2018·Medical Physics·Daniel GourdeauLouis Archambault
Nov 26, 2010·Physics in Medicine and Biology·Hans L RiisPoul Riis
Sep 15, 2019·Journal of Applied Clinical Medical Physics·Mateusz BaranZbisław Tabor
Apr 28, 2012·Physics in Medicine and Biology·Tom DepuydtMark De Ridder

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