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Table 1 Summary of the magnitudes of the max and 95% position differences (scaled at isocenter) between predicted and actual (MV segmented) fiducial positions for individual patients

From: Evaluation of transperineal ultrasound imaging as a potential solution for target tracking during hypofractionated radiotherapy for prostate cancer

Patient # Magnitude of position differences @ iso (mm)
Maximum At 95% relative cumulative occurrence
Without tracking With tracking Without tracking With tracking
1 2.3 1.8 1.7 1.2
2 3.1 1.7 2.2 1.3
3 1.3 1.3 1.1 1.0
4 3.9 3.3 2.4 2.1
5 1.9 1.5 1.5 1.2
  1. Position differences are calculated with and without ultrasound tracking