The biopsy diagnosis was epidermoid carcinoma, Grade 3. Supervoltage x-ray therapy was given. The patient was well for 9 months, after which symptoms of dysphagia recurred. Examination did not ...

Beamed from a supervoltage machine, cobalt-60 has largely replaced conventional X ray in treating cancers of the head, esophagus, neck, cervix, uterus and bladder; higher dosages of cobalt-60 can ...

There has been a progression of higher-energy machines, including contact therapy machines, superficial therapy machines, orthovoltage therapy machines, supervoltage therapy machines, and the now ...