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. 2021 Dec 29;7(3):100885. doi: 10.1016/j.adro.2021.100885

Fig. 4.

Fig 4

Correlative linear mixed model for lung tumor (GTV) displacement and internal fiducials centroid (fiducial) or external surrogate centroid (block) (all quantities in cm). (A) Lung tumor displacement along the Y (AP) direction and fiducial displacement along the Y (AP) direction; n = 24. (B) Lung tumor displacement along the Z (SI) direction and fiducial displacement along the Z (SI) direction; n = 24. (C) Lung tumor displacement along the Y (AP) direction and external surrogate displacement along the Y (AP) direction; n = 11. (D) Lung tumor displacement along the Z (SI) direction and external surrogate displacement along the Y (AP) direction; n = 11. AP displacements are positive if the structure moves anterior relative to end-exhalation; SI displacements are positive if it moves superior relative to end-exhalation. Dots are data points, solid lines are best fits for prediction model, and dashed curves are 95% prediction intervals. Abbreviations: AP = anterior-posterior; block = centroid of gating block used as external surrogate; fiducial = fiducial centroid; GTV = gross tumor volume of the lung tumor; PRESS = predicted residual sum of squares; SI = superior-inferior.