Imaging Plate を用いた炭素線と位置照合用X 線軸の変位量評価方法の開発

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  • A Novel Evaluation Method for Displacement between Carbon Beam Axis and Positioning X-ray Axis Using an Imaging Plate
  • Imaging Plate オ モチイタ タンソセン ト イチ ショウゴウヨウ Xセンジク ノ ヘンイリョウ ヒョウカ ホウホウ ノ カイハツ

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Purpose: We developed an evaluation method for easily calculating displacement directly between the carbon beam axis and positioning X-ray axis. Methods: A verification image was acquired by irradiating an imaging plate with a carbon beam and X-ray. The X-ray passed through a lead plate inserted in the range compensator holder. The displacement was calculated on the verification image from the center of a wire irradiated with carbon using a multi leaf collimator (MLC) and a wire irradiated with X-ray also using MLC. The accuracy of the method was evaluated by moving the carbon beam axis, the X-ray axis, and the setup angle. The weekly changes of vertical and lateral beams in all rooms were also evaluated. Results: The displacements of the carbon beam axis and the setup angle did not influence the calculation results, whereas the displacement of the X-ray axis did (R=0.999). The displacements including weekly changes were all less than 1.00 mm. Conclusion: An evaluation method for calculating the displacement directly and simply between the carbon beam axis and positioning X-ray axis was developed and verified. The weekly changes of displacement between axes were evaluated to be acceptable at our facility.

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