|
FIG 1. Device components.
A, Nonsterile skin entry localizer is composed of two image-conspicuous lines (barium impregnated silicon) in a truncated inverted V-shaped triangular configuration. The millimeter distance measured between the two V limbs of the pattern is equal to the actual image section plane location on the printed millimeter scale. The pattern has a thicker image-conspicuous band paralleling the radiologic right V limb that is used as a right-left reference. The radiologic right V limb is the 0-mm reference. A series of offset lines at 10-mm increments are printed on the pattern. The intersection of the chosen vector with the pattern is defined as a specific point on the pattern by the two coordinates (slice select, offset). In this example, the skin entry point located at slice select 53 mm and offset 8 mm is marked with a pen.
B, Sterile skin entry-point localizer. The center of this pattern is centered over the predefined marked skin entry point.
C, View of the upper vector point components parallel to the skin. The device comes with an incorporated sterile adhesive drape and a circular opening with an attached base ring to support the upper level pattern platform.
D, View of the upper vector point localizer seen from above. The upper vector point localizer has a clear diaphragm pattern and printed scale that is used in a manner identical to that of the skin point localizer.
|