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Image layers in the Zonarc.

The Zonarc (Palomex Oy, Helsinki, Finland) uses the principles of rotational panoramic radiography to image various structures of the head and neck. System parameters obtained from the manufacturer have been used to derive data on the imaging characteristics of the Zonarc when using each of the following programmes: MT, DENT, TMJ, EAR, CV and LAT. The beam path along with the shape, position and relative thickness of the layer has been calculated for each programme, together with the resolution and magnification associated with the different layers.