No abstract
SIR,-Dr Richard Smith's valuable editorial' indicated some important aspects of the present state of knowledge of neutron treatment, emphasising the necessity for cost efficiency.By contrast, it may be helpful to indicate some important aspects of the state of knowledge of a modern linear accelerator together with approximate costing.A new technical approach whereby radiation can be guided by computer from the primary growth along the sinuous track of invasion of the lymph nodes with minimal radiation of surrounding tissues is now possible.24 The cost of treating one patient could be around £300.A special advantage of the linear accelerator is the production of electrons to enable the efficient high dose radiation of the internal mammary nodes while avoiding significant damage to the heart beneath in the treatment of breast cancer.'
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