4D-RT: Tumor tracking and gating
Intra-fractional motion can cause large geometrical errors or increase PTV size drastically
Techniques such as gating and tumor tracking are good at addressing these issues. However, to ensure the best possible treatment outcome, they require a special QA system that can recreate target movements. With HexaMotion, you can check and verify the effects of intra-fractional motions of the tumor and OAR.
When considering whether or not to apply 4D-RT, there are a couple of questions you should ask: What do I gain from MLC tracking or gating for the individual patient (or group of patients)? Do I hit the target without exceeding the OAR doses?
A QA program for 4D-RT should consider the following parameters. At the end of the day, it’s really the last point, the ability to verify the dosimetric effect, that is most important.