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. 2015 Oct 3;63(1):48–58. doi: 10.1002/jmrs.141

Figure 3.

Figure 3

The difference in the RS file created CBCT points when anti‐collision couch re‐positioning has occurred during CBCT acquisition. On each image above the Planiso = the green POI and the CBCT midpt = the purple POI. (a) When no anti‐collision couch repositioning is applied, the DICOM‐RT RS generated POIs have the same coordinates (the orange POI). (b) When anti‐collision couch repositioning occurs, the AcqIsocentre (the light blue POI) = the isocentre during scanning and the InitLaserIso and InitMatchIso POIs = the isocentre position before and after couch repositioning and will have the same coordinates (the orange POI).