Abstract
A description is given of a trolley incorporating a hydraulic lift, which facilitates the setting-up of radiation beam treatments in a high-pressure oxygen chamber used in conjunction with a linear accelerator of isocentric type having a fixed height of rotational centre. Use is made of a synchronised pair of hydraulic jacks acting on two independent sliding frames at the ends of the trolley. As compared with a design employing a single jack, this arrangement avoids the difficulty of constructing a parallel-motion system which would perform satisfactorily under the stresses imposed on the structure by inequalities in floor level. The design further provides ample ground clearance and so eliminates the necessity to retract the supporting ram of the normal couch during oxygen treatments.
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