Journal: Physics in Medicine and Biology
Article Title: Impact of daily volumetric imaging on target tracking without fiducial markers during robotic treatment of pancreas
doi: 10.1088/1361-6560/ae6229
Figure Lengend Snippet: CKImage v1.3. The two images are the two orthogonal kV Cyberknife images. The corresponding digitally reconstructed radiographs (DRRs) are exposed for illustrative purposes in the top right and bottom left of each image. The difference in diaphragm position between the DRR and the treatment image is highlighted at the top of the left image by the white arrow. The yellow arrows show the registration of the treatment images with the DRRs (downwards in this example because the diaphragm is positioned downwards). The fiducials are visible at the centre, but these are removed by image processing for analysis purposes. The red area represents the PTV projected from the planning CT scan, therefore registered inherently with the DRR, the blue area represents the PTV tracked without fiducials using a motion model, and the green area represents the position of the PTV as tracked with fiducials by the Cyberknife system at the time of treatment.
Article Snippet: The Cyberknife robotic linear accelerator (Accuray Inc., Sunnyvale, CA) is ideally suited for the treatment of pancreatic tumours as it has a tracking subsystem which is valuable for real-time tracking of moving targets (Asmerom et al , Ding et al , Kilby et al ).
Techniques: Computed Tomography