The isocentre visualisation page enables reslices to be displayed perpendicular to the 'z' axis of an external coordinate system that is defined using the isocentre task page.
A reslice is an image calculated from the pixels in the original 3D data that are closest to a particular plane. The angle of the plane is determined by the external coordinate system which is stored inside Stradwin as the 'isocentre calibration'. The 'x' and 'y' locations and dimensions of the plane are calculated from the position and extent of the data that is currently loaded. The 'z' position of the plane can be adjusted using the tracker-strip labelled 'Translate normal to plane'.
See the isocentre task page for information about how to perform the isocentre calibration that defines the external coordinate system.
When you have got an image you like, you can save it in a variety of formats (Windows bitmap, PNG, JPEG, TIFF) using the button at the bottom of the task page.