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Fig. 4 | Radiation Oncology

Fig. 4

From: Determining optimal planning target volume and image guidance policy for post-prostatectomy intensity modulated radiotherapy

Fig. 4

Increased rectum inside PTV. Geographic miss could be avoided using soft tissue matching in a number of instances. A planning CT (left) and CBCT scan (right) are shown in this example. In this case averaged soft tissue matching would have allowed a geographic miss to be corrected using the 1 cm uniform PTV expansion (black line), but a large amount of rectum would have been treated. The white line is the CTV. Critical structure avoidance therefore needs to be reviewed when matching online

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