If the target volume is defined using CT, the CT data may then be exported from the planning system to AlignRT® as a DICOM RT structure to use as a reference image. The reference image can be moved within AlignRT® so that the isocentre is moved from the CT isocentre to the Isocentre position as defined by the planning process.

If a conventional simulator is used for planning, the PlanRT module can be used to extract a full set of 3D contours and a 3D lung model can be generated for planning. This data can then be exported as a DICOM RT structure to the planning system. The 3D surface acquired at simulation can also be used as a positioning reference. The image acquisition can be gated in order to minimise any systematic errors caused by respiratory motion.

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