Millar J K
Radiography. 1979 Sep;45(537):197-9.
The shape of the "in-focus" zone or focal trough given by the Orthopantomograph machine is shown. The anterior part of this zone is only 6 mm in thickness. The roots of the incisor teeth should, if possible, be placed accurately in this zone and a method of achieving this is suggested.
展示了全景断层摄影机所给出的“聚焦”区或焦槽的形状。该区域前部厚度仅为6毫米。如果可能的话，切牙的牙根应准确放置在该区域，并提出了实现这一点的方法。
