Transparent box enables three dimensional viewing of CT imaging of the liver.

We designed a transparent box to reconstruct cross sectional computed tomography (CT) imagings of the liver into a three dimensional form. The objective was to clearly visualize the area of lesion and to facilitate clinical teaching. This box (31.5 X 22.0 X 18.5 cm) is made of acrylic board containing 16 demountable panels layered horizontally at 10-mm intervals. The transparency of the CT film is projected onto these panels at each height of the liver, and findings including location of the tumor, main vessels and adjacent organs are outlined with an erasable marker. After completion of each tracing, the panels are replaced in the box and the total layer forms a completed picture of the CT findings. Since 1981, we have used this tool to assess resectability and/or to select adequate procedures for treating 54 patients with liver tumor. The solid picture gives an definite location of the tumor and its extension. In the clinical work-up, indication for surgery and a procedure of choice can be discussed by the team, using this visual aid.