Evaluation of the middle and inner ear structures: comparison of hybrid rendering, virtual endoscopy and axial 2D source images |
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Authors: | M D Seemann O Seemann H Bonél M Suckfüll K-H Englmeier A Naumann C M Allen M F Reiser |
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Institution: | (1) Department of Diagnostic Radiology, Eberhard-Karls University of Tuebingen, Hoppe-Seyler-Strasse 3, D-72076 Tuebingen, Germany, DE;(2) Department of Diagnostic Radiology, Klinikum Grosshadern, University of Munich, Munich, Germany, DE;(3) Department of Psychiatry, Klinikum Innenstadt, University of Munich, Munich, Germany, DE;(4) Department of Otorhinolaryngology, Head and Neck Surgery, Klinikum Grosshadern, University of Munich, Munich, Germany, DE;(5) Department of Medical Informatics and Health System Research, GSF-National Research Center for Environment and Health, Neuherberg, Germany, DE |
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Abstract: | Recent developments in 3D reconstructions can enhance the quality and diagnostic value of axial 2D image data sets with direct
benefits for clinical practice. To show the possible advantages of a hybrid rendering method color-coded 3D shaded-surface
display (SSD)- and volume rendering method] with the possibility of virtual endoscopy we have specifically highlighted the
use in relation to the middle and inner ear structures. We examined 12 patients with both normal findings and postoperative
changes, using image data sets from high-resolution spiral computed tomography (HRSCT). The middle and inner ear was segmented
using an interactive threshold interval density volume-growing method and visualized with a color-coded SSD rendering method.
The temporal bone was visualized using a transparent volume rendering method. The 3D- and virtual reconstructions were compared
with the axial 2D source images. The evaluated middle and inner ear structures could be seen in their complete form and correct
topographical relationship, and the 3D- and virtual reconstructions indicated an improved representation and spatial orientation
of these structures. A hybrid and virtual endoscopic method could add information and improve the value of imaging in the
diagnosis and management of patients with middle or inner ear diseases making the understanding and interpretation of axial
2D CT image data sets easier. The introduction of an improved rendering algorithm aids radiological diagnostics, medical education,
surgical planning, surgical training, and postoperative assessment.
Received: 22 July 1998; Revised: 15 April 1999; Accepted: 19 April 1999 |
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Keywords: | : Temporal bone CT Ear middle Ear labyrinth Three-dimensional CT hybrid rendering Virtual endoscopy |
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