EdenteV2, Main, Exploration, bibRecord, 00AB73

Frequency domain analysis of cross-sectional images of the posterior mandible

Identifieur interne : 00AB73 ( Main/Exploration ); précédent : 00AB72; suivant : 00AB74

Frequency domain analysis of cross-sectional images of the posterior mandible

Auteurs : Ssu-Kuang Chen [États-Unis] ; Lars Hollender [États-Unis]

Source :

Oral Surgery, Oral Medicine, Oral Pathology [ 0030-4220 ] ; 1994.

RBID : ISTEX:2C8ABA8126F94DAA9754F191D48078FC61370119

Descripteurs français

Wicri :
- topic : Zone franche.

English descriptors

Abstract

Abstract: The Siemens Orthophos (Siemens, Mu¨nchen, Germany) is a panoramic machine that uses a microchip to control the movements of the radiation source and film. Several programs are available for different views of the facial skeleton and associated structures. Program 16 is dedicated to cross-sectional imaging of the posterior mandible. Three millimeter cross-sections were cut from 12 cadaver specimens of the mandible. These sections were imaged separately by contact radiography, 48° hypocycloidal tomography of Philips Polytome (Philips-Massiot, Paris, France), and program 16 of the Orthophos panoramic machine. Program 16 of the Orthophos was also used to image the cross-sections after they were glued back together with the surrounding parts of the specimens. Four different images of the cross-sections were thus obtained. The contact radiographs were used as gold standards. Frequency domain analysis, which was used to compare the images resulting from each imaging modality, demonstrated that useful diagnostic information was in the range of 0.12 to 0.60 cycles/mm for the contact radiographs. In spite of differing tomographic angles for the Orthophos program 16 and the hypocycloidal tomography, the images of the 3 mm cross-sections showed similar frequency distribution. However, the Orthophos Program 16 did not produce diagnostically useful images when the cross-sections were imaged with the surrounding parts of the specimens probably because of the narrow tomographic angle used for this program. These images had strong low to medium frequency components compared with the gold standard images. These results suggest that diagnostically more useful images with the Orthophos might be obtained by increasing the tomographic angle.

Url:

https://api.istex.fr/document/2C8ABA8126F94DAA9754F191D48078FC61370119/fulltext/pdf

DOI: 10.1016/0030-4220(94)90302-6

Affiliations:

États-Unis

Links toward previous steps (curation, corpus...)

to stream Istex, to step Corpus: 001567
to stream Istex, to step Curation: 001567
to stream Istex, to step Checkpoint: 005036
to stream Main, to step Merge: 00B216
to stream Main, to step Curation: 00AB73

Le document en format XML

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<front><div type="abstract" xml:lang="en">Abstract: The Siemens Orthophos (Siemens, Mu¨nchen, Germany) is a panoramic machine that uses a microchip to control the movements of the radiation source and film. Several programs are available for different views of the facial skeleton and associated structures. Program 16 is dedicated to cross-sectional imaging of the posterior mandible. Three millimeter cross-sections were cut from 12 cadaver specimens of the mandible. These sections were imaged separately by contact radiography, 48° hypocycloidal tomography of Philips Polytome (Philips-Massiot, Paris, France), and program 16 of the Orthophos panoramic machine. Program 16 of the Orthophos was also used to image the cross-sections after they were glued back together with the surrounding parts of the specimens. Four different images of the cross-sections were thus obtained. The contact radiographs were used as gold standards. Frequency domain analysis, which was used to compare the images resulting from each imaging modality, demonstrated that useful diagnostic information was in the range of 0.12 to 0.60 cycles/mm for the contact radiographs. In spite of differing tomographic angles for the Orthophos program 16 and the hypocycloidal tomography, the images of the 3 mm cross-sections showed similar frequency distribution. However, the Orthophos Program 16 did not produce diagnostically useful images when the cross-sections were imaged with the surrounding parts of the specimens probably because of the narrow tomographic angle used for this program. These images had strong low to medium frequency components compared with the gold standard images. These results suggest that diagnostically more useful images with the Orthophos might be obtained by increasing the tomographic angle.</div>
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Frequency domain analysis of cross-sectional images of the posterior mandible

Frequency domain analysis of cross-sectional images of the posterior mandible

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri