ESTRO 2024 - Abstract Book

S4393

Physics - Intra-fraction motion management and real-time adaptive radiotherapy

ESTRO 2024

Figure 1. Frames produced from the imaging of a sphere undergoing breathing motion (Amplitude: ±20 mm Period: 3s) using carbon radiography. The red cross represents the estimated position of sphere’s center

Figure 2 shows the sphere position, determined from the ion radiographs, vs the expected position of the sphere according to the known table motion. The tracking accuracy achieved was < 5 mm for proton radiographs and < 2mm for carbon radiographs. Variations in scanning speed and pattern were found to greatly impact the appearance of the sphere in the resulting radiographs and the accuracy of position estimates.