Three dimensional reconstruction method based on a simplified self-calibration model

This study was performed to clarify the complex three-dimensional shape of the round window and its membrane, and to measure these structures by using the computer-aided three-dimensional reconstruction method we developed. The equipment used included a personal computer, a high-resolution, 14-Inch color monitor, and a digitizer. Materials consisted of five normal temporal bones obtained from five individuals with negative otologic histories who had been 5 months and 14, 15, 18, and 59 years old at death. Round window membranes were found to be convex to the middle ear side when viewed in the coronal plane, but to be concave when viewed in the sagittal plane; thus the membrane in most cases seemed to be shaped like a saddle, tapered toward the vestibular end. The average maximal diameter, sagittal length, horizontal width, and surface area of the round window were 2.32 ± 0.19 mm, 2.08 ± 0.22 mm, 1.76 ± 0.10 mm, and 2.70 ± 0.43 mm2, respectively. The average surface area of the round window membrane was 2.98 ± 0.43 mm2.

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Three-Dimensional Reconstruction and Measurement Study of Human Eustachian Tube Structures: A Hypothesis of Eustachian Tube Function

Annals of Otology Rhinology & Laryngology ◽

10.1177/000348949810700701 ◽

1998 ◽

Vol 107 (7) ◽

pp. 547-554 ◽

Cited By ~ 28

Author(s):

Masaharu Sudo ◽

Isamu Sando ◽

Chiaki Suzuki

Keyword(s):

Eustachian Tube ◽

Three Dimensional ◽

Lymphoid Tissues ◽

Reconstruction Method ◽

Eustachian Tube Function ◽

Three Dimensional Reconstruction ◽

Inferior Margin ◽

Dimensional Reconstruction ◽

Tube Function ◽

Temporal Bones

Histologic sections from nine temporal bones with eustachian tubes (ETs) attached were analyzed with a computer-aided three-dimensional reconstruction method to determine the curvature and tilt of the ET and the anatomic relationships between the medial lamina of the ET cartilage, the levator veli palatini muscle (LVPM), and Rosenmüller's fossa. It was found that the ET is convex superomedially and is tilted medially. The LVPM is located inferolateral to the inferior margin of the medial lamina of the anterior ET cartilage. The LVPM is inferior to the medial lamina of the posterior ET cartilage. These findings suggest that the LVPM opens the anterior cartilaginous portion of the ET by rotating the medial lamina with increased dimension of the muscle body when it contracts. Rosenmüller's fossa extends along the ET with rich lymphoid tissues as far as approximately one half the total length of the ET and very close to the skull base.

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Three-Dimensional Reconstruction of Bubble Distribution in Two-Phase Flows With Metaball Technique

Volume 1: Fora, Parts A, B, C, and D ◽

10.1115/fedsm2003-45218 ◽

2003 ◽

Author(s):

Toru Furukawa ◽

Yassin A. Hassan ◽

Javier Ortiz-Villafuerte

Keyword(s):

Image Processing ◽

Three Dimensional ◽

Bubbly Flows ◽

Reconstruction Method ◽

Three Dimensional Reconstruction ◽

Two Phase Flows ◽

Two Phase ◽

Real Experiment ◽

Bubble Distribution ◽

Dimensional Reconstruction

A three-dimensional reconstruction method using shadowgraphy for complex shaped bubbly flows is proposed. Bubble distribution is represented by a metaball object. Metaballs have the capability of representing smooth but complex surfaces. The fundamental strategy is searching the optimal metaball object equivalent to the original bubble distribution. The method does not assume that every bubble has a certain size or shape, therefore, intensive image processing on shadow images is not required. This method has applied to both synthetic bubble shadow images and those obtained from a real experiment, and the results indicate the potential ability of bubble reconstruction.

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