CT以前都用華氏位x光照，放射線也比CT少，但現在五官科醫師不用。

家醫和兒醫還用。

https://en.wikipedia.org/wiki/Waters'_view

Waters' view

From Wikipedia, the free encyclopedia

 

 

Method of obtaining Waters' view

Waters' view (also known as the Occipitomental view) is a radiographic view, where an X-ray beam is angled at 45° to the orbitomeatal line.^[1] The rays pass from behind the head and are perpendicular to the radiographic plate. It is commonly used to get a better view of the maxillary sinuses. Another variation of the waters according to Merrill's Atlas of Radiographic Positioning and Procedures places the orbitomeatal line at a 37° angle to the image receptor.