ESTRO 2024 - Abstract Book

S3806

Physics - Image acquisition and processing

ESTRO 2024

Results:

The durations of the recorded 1D-RNAV signals varied between 304-536s. The mean (min-max) expected imaging efficiency was 42% (17-55%). A large range in mean peak-to-peak amplitude was observed (8.2-21.3mm). The mean respiratory cycle duration was 3.5-6.0s, and the mean duration of the signal within the predefined motion compensation window was 0.9-2.0s. The mean observed end-exhale position deviation was 0.2-1.8mm, except for an outlier of 3.7mm (Figure 2). A significant negative correlation (R=−0.8, p=0.004) was found between the mean peak-to-peak amplitude and the imaging efficiency. No significant correlation was found between the respiratory cycle duration and the imaging efficiency. A positive correlation (R=0.8, p=0.003) was found between the mean duration of respiratory signal within the motion-compensating window and the imaging efficiency. A negative correlation (R=−0.9, p<0.001) was found between the end-exhale position deviation and the imaging efficiency. When using a retrospectively defined motion-compensating window, the mean imaging efficiency increased to 45% (28-56%). Counterintuitively, the mean duration of the 1D-RNAV signal within the window decreased in 9 out of 11 cases and varied between 0.7-2.2s.

Conclusion: