Institute for
Robotics and Process Control

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Segmentation/3D reconstruction of inner nasal structures

Geometric configuration of nasal cavity and paranasal sinuses from CT images


The nasal cavity is a large air-filled space above and behind the nose in the middle of the face. It is divided into right and left halves by the nasal septum. The width of the nasal cavity is further reducedby bony projections from the lateral wall of the nose (inferior, middle and superoir turbinate) covered by a mucosa layer. The paranasal sinuses are an anatomically complex system that communicates with the nasal cavity being composed by four pairs of holow structures named according to the bones they lie under. The precise knowledge of the nasal cavity and paranasal sinuses geometry is a very important step to obtain a precise biomechanical model. To obtain a 3D-representation, the CT images should be segmented and a volume is reconstructed.

Videos:

3D reconstruction of inner nasal structures from patient and anatomical model.

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1) and 2) 3D-reconstructions of paranasal sinuses from CT images using Amira software. Images in frontal and lateral views: frontal (yellow), ethmoidal (green), maxillary (blue) and sphenoidal sinuses (red).
3) maxillary ostium that connects the maxillary sinus to the nasal cavity

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4) Inferior turbinate of a cadaver head.
5) 3D reconstruction of the inferior turbinate from CT images of a patient.
6) CAD model based on 3D reconstruction showing cross-sections of the anterior and posterior segments.

3D endoscopic approach for functional endoscopic sinus surgery


During Functional Endoscopic Sinus Surgery, the surgeon moves the endoscop and other surgical instruments within the nasal cavity following specific paths to approach each one of the paranasal sinuses. It is possible to reconstruct these paths using volumetric CT data.

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1) 3D reconstruction of endoscop interaction with inner nasal structures
Approach to 2) frontal sinus and 3) maxillary sinus
All pictures taken with Amira Software

Slides


  • Paranasal sinuses segmentation/reconstruction for robot assisted endonasal surgery, Porto, Portugal, 2007[
  • Analysis of manual segmantation in medical image processing, Porto, Portugal, 2007
  • 3D endoscopic approach for endonasal sinus surgery, Lyon, France, 2007(PDF)
  • Comparison between manual and semi-automatic segmentation of nasal cavity and paranasal sinuses from CT images, Lyon, France, 2007(PDF)

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