Figure 1From: Stereotactic, single-dose irradiation of stage I non-small cell lung cancer and lung metastasesImage fusion of three dynamic CT scans in a reconstructed sagittal plane for determining target position (CTV) during respiration. (Green line: normal inhalation, pink line: naturally contracted position of the chest, blue line: normal exhalation, red line: PTV.) Tilting the tumor in x and y axes during respiration facilitates the phase-specific display of the CTVs.Back to article page