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Journal of the Egyptian National Cancer Institute
Fig. 3 | Journal of the Egyptian National Cancer Institute

Fig. 3

From: A retrospective comparison of two different immobilization systems for radiotherapy of extremity soft tissue sarcomas and its influence on CTV-PTV margin

Fig. 3

Online KV portal image matching with DRR for a case of Vac-Loc™ fixation. The figure shows the overlay of the digitally reconstructed image (DRR) of CT simulation and the KV portal image taken during treatment for a patient immobilized using the Vac-Loc™ in the anterior and lateral views. Bony structure and body contour delineated on the DRR by green color was matched with KV portal images. The red color represents the PTV. The computerized system generated table showed the isocenter shifts measured in cm in Vrt (vertical), Lng (longitudinal), Lat (lateral) and Rtn (Rotational) directions for that patient on the treatment day

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