In {HEAD ~ both the gantry and fixed beam configurations}, {TAIL ~ the patient table} can be fixed or moveable 
In { HEAD ~ both the gantry and fixed beam configurations } , { TAIL ~ the patient table } can be fixed or moveable
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH