The impact of CT window settings on the contouring of a moving target: A phantom study

• We analysed the impact of window level on contouring of moving targets.
• We assessed the data by using a water filled phantom and different CT-scan acquisitions.
• Cranio-caudal tumor motion will lead to underestimation of target volumes in the slow 3D-CT.
• Even if lung windowing is used, reevaluation of the contoured target in different planes is necessary.