Abstract
In head and neck region, the upper air way is surrounded by bones, Therefore X-ray picture of upper air way is disturbed by bone shadow.
Linacgraphy taken by 6-MeV Linac reduce the contrast between bone and water, and maintain the contrast between air and water. Therefore, Linacgraphy of head and neck region clear away bone shadow, and demonstrate upper air way clearly.
Linacgraphy of head and neck region is necessary for diagnosis and radiation treatment of tumor of upper air way.
