PICTORIAL INTERLU DE

'The ghost in the
machine'

Ian C Duncan
FFRad (D) SA

Unitas Interventional Unit
Centurion

An artefactual image created by superimposition of the temporal bones in a near-
lateral projection after mask acquisition and three-dimensional computer-gener-
ated reconstruction during a cerebral digital subtraction rotational angiographic
study.

36 SA JOURNAL OF RADIOLOGY • June 2003