In radiation therapy, a vague term for voltage between 400 and 600 kv. ... (05 Mar 2000) ... 
(or´tho-vōl″tәj) in radiation therapy, voltage in the range of 140 to 400 kilovolts, as contrasted to supervoltage and megavoltage.
Type: Term Pronunciation: ōr′thō-vōl′tăj Definitions: 1. In radiation therapy, a term for voltage between 400 and 600 kV.
orthovoltage High voltage, as used for x-ray production, in the range of 200 to 300 kilovolts.