Office of NIH History  
A Short History of the National Institutes of Health
  X-Ray apparatus  
   
  Photograph of an X-ray used for treatments for cancer were first tested on tumors for mice. This instrument was used to position the mouse so that only the tumor to be irradiated was exposed while the rest of the body was protected.  
     
  "In 1944, X-ray treatments for cancer were first tested on tumors for mice. This instrument was used to position the mouse so that only the tumor to be irradiated was exposed while the rest of the body was protected."  
     
     
     
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