Reproducibility assessment of dynamically deforming DEFGEL in a respiratory motion phantom

8th International Conference on 3D Radiation Dosimetry

Franich, R.D.^1 ; Supple, J.R.^1 ; Lindsay, B.^1 ; Yeo, U.J.^1 ; Lonski, P.^1,2 ; Smith, R.L.^1,3 ; Taylor, M.L.^1 ; Dunn, L.^1 ; Kron, T.^1,2

School of Applied Sciences, Health Innovations Research Institute, RMIT University, Melbourne

VIC, Australia^1

Physical Sciences, Peter MacCallum Cancer Centre, Melbourne

VIC, Australia^2

William Buckland Radiotherapy Centre, Alfred Hospital, Melbourne

VIC, Australia^3

关键词: Deformation cycle;    Gel dosimeter;    Reproducibilities;    Respiratory motions;    Setup errors;    Voxel size;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/573/1/012024/pdf
DOI  :  10.1088/1742-6596/573/1/012024

来源: IOP

【 摘 要 】

Conducting four-dimensional deforming dosimetry with a deformable gel dosimeter presents several challenges for implementation and interpretation of results. In this work, we describe a modification to a respiratory motion phantom to accommodate the DEFGEL dosimeter, and an evaluation of the reproducibility of the setup and deformation cycle. Setup errors are sub-mm while deformation reproducibility is typically less than half the CT voxel size (1 mm AP and LR; 3 mm SI). 4DCT confirms the absence of hysteresis.