Korean J Oral Maxillofac Radiol.  2002 Mar;32(1):27-33.

Influence of threshold value of computed tomography on the accuracy of 3-dimensional medical model

• Lee BD
• Lee W

Abstract

PURPOSE: To evaluate the influence of threshold value of computed tomography on the accuracy of rapid prototyping (RP) medical model MATERIAL AND METHODS: CT datas of a human dry skull were transferred from CT scanner via compact disk to a personal computer (PC). 3-dimensional image reconstruction on PC by V-works(TM) 3.0 (CyberMed. Inc.) software and RP models fabrication were followed. 2-RP models were produced by threshold value of 500 and 800 selected in surface rendering process. Linear measurements between arbitrary 12 anatomical landmarks on dry skull, 3-D image model, and 2-RP models were done and compared. Thus, the accuracy of 500 RP and 800RP models was respectively evaluated.
RESULTS
There was mean difference (% difference) in absolute value of 2.27 mm (2.73%) between linear measurements of dry skull and 500 RP model. There was mean difference (% difference) in absolute value of 1.94 mm(2.52%) between linear measurements of dry skull and 800 RP model.
CONCLUSION
Slight difference of threshold value in rendering process of 3-D modelling made a influence on the accuracy of RP medical model.

Keyword

tomography; x-ray computed; models; anatomic; skull

MeSH Terms

Compact Disks
Humans
Image Processing, Computer-Assisted
Imaging, Three-Dimensional
Microcomputers
Skull