Din, Wan Shah Jihan Wan
(2006)
The accuracy of stereolithography medical model of sinonasal anatomical structures compare to 3D CT scan measurement.
Masters thesis, Universiti Sains Malaysia.
Abstract
Introduction
Stereolithography is a relatively new tool in medicine. It has been used to produce many
anatomical models in various fields. The accuracy of stereo lithography is thus essential to
provide real replacement and time saving procedure.
Objectives
The objectives of this study are to develop stereolithography model for sinonasal region
for ENT and craniofacial teaching and to assess the accuracy of stereo lithography model
produced by our stereolithographic apparatus. It is also to evaluate the suitability of
stereolithography model to be used as pre surgical planning for endoscopic sinus surgery
together with an Image Guided System. If appropriate the model also will be used for
surgical training for resident.
Methodology
Data with normal paranasal sinus was collected from USM craniofacial CT scan
database. The images were processed with a specific procedure using MIMIC software. A
stereolithography model was produced using the data. The model was compared with 3D
CT scan image using specific landmark. The landmarks were divided into general
craniofacial measurements and sinonasal measurements. The model was tried for
simulated endoscopic sinus surgery using Image Guided System.
Results
The stereolithography model shows an accuracy of 99.82% for general craniofacial
measurement and 99.68% for sinonasal measurement. Lamina papyracea thickness
produces the largest error of28.71%. There is no pattern to indicate internal measurement
group is opposite to the value of external measurement group. The stereolithography
model is not suitable to be used as planning of endoscopic sinus surgery, since the
anatomy requirement is very critical in the related area.
Conclusion
Stereolithography model is accurate in the dimensions that were measured. The model is
suitable for planning in craniofacial surgery. However to be used as presurgical planning
in endoscopic sinus surgery, it is still not detail enough. Further improvement in material
used in stereolithography is needed before it can be utilised as presurgical model for
endoscopic sinus surgery.
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