ESTRO 2025 - Abstract Book

S4120

RTT - Patient care, preparation, immobilisation and IGRT verification protocols

ESTRO 2025

Fig. 1 – Thuasne Reversa Vario Promaster compression belt

Results: A total of 17 patients (18 tumours) were evaluated. The compression belt was well tolerated by all patients. In general, the 4D-CT reconstruction showed less artefacts around the diaphragm and tumour when using the belt. A comparison of the peak-to-peak amplitude with and without compression is shown in figure 2. For most patients, a reduction of tumour motion is visible, although for some patients a slight increase was observed. In 3 patients with larger tumour motion, a large reduction of tumour motion of 40 to 60 % was visible. For smaller amplitudes, the reduction appears to be smaller (figure 2d), with an average decrease of around 20%.

Fig.2 – Amplitude iin three directions (a,b,c) and ratio of PtP amplitude as a function of amplitude (d).

Conclusion: An abdominal compression belt can be used as a simple and low-cost aid for reducing tumour motion in SBRT, specifically for patients with larger peak-to-peak amplitude. Use of the belt resulted in less artefacts in the 4D CT reconstruction. As in some cases the clinical benefit is limited, or even a slight increase in breathing motion is observed, the decision to use the belt should be based on a comparison of the 4D CT with and without compression.

Keywords: SBRT, Motion reduction, compression belt

References: [1] https://nl.thuasne.com/nl/reversar-vario-promaster-ongetailleerd