IMRT 2018

No#motion#management#– 3DCT#imaging#

Examples of breathing-induced image artefacts in coronal 3DCT images

Duplicate structures seen in tumour

Overlapping contours and smearing of diaphragm

Overlapping structures and smearing of tumour

• averaging of the attenuation properties of tissue within the voxels • organ movement faster than CT gantry rotation • organ movement during adjacent CT gantry rotations

Persson'G'F'2011'PhD'Thesis''University'of'Copenhagen