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Table 5 Comparison between protocols of hospitals and margins calculated

From: A comparison of two systems of patient immobilization for prostate radiotherapy

Immobilization device Protocol of hospitals Margins calculated for each axis (mm)
AP CC ML
Whole body alpha-cradle 0.5 to 1 cm (1 cm margin is usually used except 0.6 cm posteriorly) 1.8 2.1 3.4
Hipfix system 1 cm (0.5 cm for posterior margin) 2.3 8.3 1.9