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Table 2 The mean, median, standard deviation (STD) and range ([min, max]) of the absolute difference in the inter-marker distances (IDs) of the precisely located FMs between CT and MRI for all the single observers and for all the five observers

From: Evaluation of gold fiducial marker manual localisation for magnetic resonance-only prostate radiotherapy

Sequence Observer Mean Median STD Range
Single 1 0.8 0.6 0.7 [0.1, 3.1]
  2 0.6 0.5 0.5 [0.0, 2.5]
  3 0.7 0.6 0.5 [0.0, 2.1]
  4 0.7 0.6 0.6 [0.1, 2.9]
  5 0.7 0.5 0.6 [0.1, 2.5]
  All 0.7 0.6 0.6 [0.0, 3.1]
Multiple 1 0.7 0.4 0.6 [0.0, 2.7]
  2 0.6 0.4 0.6 [0.0, 3.0]
  3 0.7 0.5 0.7 [0.0, 2.5]
  4 0.7 0.5 0.6 [0.0, 2.8]
  5 0.7 0.6 0.5 [0.0, 2.5]
  All 0.6 0.5 0.6 [0.0, 3.0]
  1. The results were calculated excluding 10/48 and 3/48 FMs for the localisation performed on a single and multiple sequences, respectively. All the values are expressed in mm