Introduction: Three-dimensional (3D) technologies represent useful tools for understanding the
complex spatial relationships of anatomical structures. Recent studies have demonstrated
the application of 3D models in preoperative temporal bone surgical simulation. However,
it is unknown whether these models can precisely simulate high-resolution X-ray microtomography
(micro-CT) scans. This study aimed to compare the accuracy of 3D virtual models with
micro-CT scans by obtaining measurements of various temporal bone structures.
Methods: Two virtual models of the temporal bone were generated from a human cadaveric temporal
bone specimen using a structured light scanner (Artec Spider, Artec 3D Lux, Luxembourg)
and micro-CT. The following parameters were measured for each model using MeshLab
(EUIPO, Italy) and digital calipers: (1) diameter of the external auditory canal,
(2) diameter of the internal auditory canal, (3) diameter of carotid foramen, (4)
distance between the mastoid point and posterior end of stylomastoid foramen (digastric
roof), (5) distance between the mastoid tip and spine of Henle, (6) distance between
postglenoid tubercle and articular eminence, (7)distance between the zygomaticotemporal
suture and articular eminence, (8) length of petrous ridge, (9) diameter of stylomastoid
foramen, (10) length of glenoid fossa.
Results: The mean difference in measured parameters between the Artec and micro-CT models
was 0.52 mm (p < 0.05). When the parameters were grouped into horizontal, vertical, and foramina
measurements, the Secondary analysis demonstrated that the most significant difference
in measurements was observed for the stylomastoid foramen and carotid foramen ([Table 1]).
Conclusion: 3D virtual models of the temporal bone provide comparable accuracy to micro-CT scans,
which may significantly benefit anatomical education and surgical planning. Further
evaluation is necessary for precisely comparing the measured parameters in 3D printed
models.
