Abstract
The exact daily repositioning of patients on radiotherapy, simulator or computed tomography couches has always caused concern. The practical difficulties of good whole-body location have in the past been compounded by the imprecise fixation methods available for this purpose, i.e. sand bags, couch props, etc. Stabilization of the head and neck has been achieved by use of the beam-direction shell which experience has shown, when fitted accurately to bony locations, to be eminently suitable for small, multiple-field treatments.
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