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Development of a protocol for coronal reconstruction of the maxillofacial region from axial helical CT data

E G Hoeffner, MD 1 D J Quint, MD 1 B Peterson, BA 1 E Rosenthal, MD 2 and M Goodsitt, PhD 1

1 Department of Radiology, Division of Neuroradiology 2 Department of Otolaryngology—Head and Neck Surgery, University of Michigan Medical Center, 1500 East Medical Center Drive. Ann Arbor, MI 48109, USA



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  		Figure 1. Reformatted coronal CT images with varying mAs. (a) Image obtained with a milliamperage of 100 mA shows blurred bone margins. (b) At 120 mA the bone margins appear sharper. Apparent differences in the amount of intracranial and maxillofacial gas and soft tissue on this and subsequent images are related to the manipulation of and change in position of the cadaver head that was necessary for direct axial and coronal scanning.

 


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  		Figure 2. (a) Direct coronal CT image with a slice thickness of 2.5 mm demonstrates a minimally displaced left cribriform plate fracture (open arrow). (b)0.4 mm reformatted coronal image with a slice interval of 0.4 mm demonstrates the discontinuity and depression of the cribriform plate (arrow). This could be seen on four contiguous reformatted images. (c)0.4 mm reformatted coronal image with a slice interval of 1.0 mm also demonstrates the fracture (arrowhead). The fracture was adequately demonstrated with these parameters and was seen on two contiguous reformatted images.

 


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  		Figure 3. (a) A right orbital roof fracture is clearly seen on the direct coronal image with a slice thickness of 2.5 mm (open arrow). Streak artefact from dental fillings degrades the image. (b) 0.4 mm reformatted image with a slice interval of 1.0 mm adequately demonstrates the fracture (solid arrow) and the streak artefact is eliminated.

 




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