Skip to main content
Figure 8 | Radiation Oncology

Figure 8

From: 4D treatment planning for scanned ion beams

Figure 8

Motion compensation parameters. For all combinations of reference treatment plan grid positions (GridPos, (x, y, E, N)) and motion phases (MotPhase #0 – #9) a compensation vector Δ(x, y, zwater) is computed. In this example the reference plan consisted of 7389 grid positions (GridPostotal). For 10 motion phases, this results in 73890 compensation vectors to describe beam adaptation from the reference motion phase (#5) to all other 9 motion phases. Parameters are shown for an anterior-posterior field, so the y component in the scanning coordinate system (beam's eye view) corresponds to cranio-caudal motion. For this patient, peak-to-peak tumor motion amplitude was approximately 12 mm.

Back to article page