Effects of projection geometry and number of projections on accuracy of depth discrimination with tuned-aperture computed tomography in dentistry
Identifieur interne : 009823 ( Main/Exploration ); précédent : 009822; suivant : 009824Effects of projection geometry and number of projections on accuracy of depth discrimination with tuned-aperture computed tomography in dentistry
Auteurs : Kazuhiro Yamamoto [États-Unis] ; Allan G. Farman [États-Unis] ; Richard L. Webber [États-Unis] ; Roger A. Horton [États-Unis] ; Kinya Kuroyanagi [Japon]Source :
- Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and Endodontology [ 1079-2104 ] ; 1998.
Descripteurs français
- KwdFr :
- Acier, Algorithmes, Analyse de variance, Biais de l'observateur, Humains, Mandibule (imagerie diagnostique), Mâchoire partiellement édentée (imagerie diagnostique), Perception de la profondeur, Processus alvéolaire (imagerie diagnostique), Prothèses et implants, Radiographie dentaire (), Tomodensitométrie (), Traitement d'image par ordinateur ().
- MESH :
- imagerie diagnostique : Mandibule, Mâchoire partiellement édentée, Processus alvéolaire.
- Pascal (Inist)
- Acier, Algorithmes, Analyse de variance, Biais de l'observateur, Dispositif CCD, Géométrie, Humains, Maxillaire, Ouverture accordée, Perception de la profondeur, Performance, Profondeur, Projection image, Prothèses et implants, Qualité image, Radiographie dentaire, Radiographie numérique, Reconstruction image, Résolution spatiale, Technique, Tomodensitométrie, Tomographie tridimensionnelle, Traitement d'image par ordinateur.
English descriptors
- KwdEn :
- Absolute error, Actual measurements, Algorithms, Alveolar Process (diagnostic imaging), Analysis of Variance, Angular disparities, Angular disparity, Anova, Apical, Apical region, Apically, Charge coupled device, Confidence intervals, Contrast ratio, Correlation distance, Dentistry, Depth, Depth Perception, Depth discrimination, Digital radiography, Disparity, Endod, Extraction site, Focal spot, Geometry, Horton, Humans, Image Processing, Computer-Assisted (methods), Image projection, Image quality, Image reconstruction, Imaging, Independent variables, Jaw, Edentulous, Partially (diagnostic imaging), Linearized, Lingual surfaces, Logarithmic, Logarithmic transformation, Ludlow, Main effects, Mandible, Mandible (diagnostic imaging), Maxillary, Observer Variation, Oral pathol, Oral surg, Oral surgery, Pathol, Pathology yamamoto, Performance, Projection, Projection geometry, Prostheses and Implants, Radiography, Dental (methods), Radiol, Radiol endod, Radiology, Reference spheres, Sample size, Significance source, Significant differences, Spatial resolution, Specimen effects, Steel, Surg, Tact imaging, Task performance, Technique, Tomography, Tomography, X-Ray Computed (methods), Tridimensional tomography, Tuned aperture, Webber, Yamamoto.
- MESH :
- chemical : Steel.
- diagnostic imaging : Alveolar Process, Jaw, Edentulous, Partially, Mandible.
- methods : Image Processing, Computer-Assisted, Radiography, Dental, Tomography, X-Ray Computed.
- Algorithms, Analysis of Variance, Depth Perception, Humans, Observer Variation, Prostheses and Implants.
- Teeft :
- Absolute error, Actual measurements, Angular disparities, Angular disparity, Anova, Apical, Apical region, Apically, Confidence intervals, Contrast ratio, Correlation distance, Dentistry, Depth discrimination, Disparity, Endod, Extraction site, Focal spot, Horton, Imaging, Independent variables, Linearized, Lingual surfaces, Logarithmic, Logarithmic transformation, Ludlow, Main effects, Mandible, Oral pathol, Oral surg, Oral surgery, Pathol, Pathology yamamoto, Projection, Projection geometry, Radiol, Radiol endod, Radiology, Reference spheres, Sample size, Significance source, Significant differences, Specimen effects, Surg, Tact imaging, Task performance, Tomography, Webber, Yamamoto.
Abstract
Abstract: Objective. The purpose of this study was to determine the degree to which the number and angular disparity of component projections influence depth discrimination with tuned-aperture computed tomography. Study design. Groups of three tiny steel spheres served as fiducial references on and in four partially edentulous mandibles. Two spheres were attached to the facial and lingual surfaces of each mandible, and the third was fixed in the apical region of an open tooth socket. Errors in estimates of the depth of the apically positioned sphere relative to the other two spheres were determined from three-dimensional tuned-aperture computed tomography reconstructions. These data were compared with actual measurements produced independently with an optical micrometer. Multiple projections required by the tuned-aperture computed tomography reconstruction algorithm were produced from radially symmetric exposures bearing angular disparities of 5, 15, 30, and 45 degrees. The number of symmetrically dispersed projections per tuned-aperture computed tomography reconstruction likewise was varied systematically (2, 4, 8, 12, and 16 projections). These variables were manipulated through the use of a balanced factorial design. Depth estimates were performed by trained observers; the estimates were based on the determination of tuned-aperture computed tomography slices perceived as imaging the respective apical spheres in sharpest focus. Specimen and observer effects were also considered as independent variables. Resulting data were normalized by logarithmic transformation and analyzed statistically by analysis of variance. Results. Significant differences (p < 0.005) were demonstrated for angular disparity and specimen effects, but the number of projections and the effect of the observer were not found to be statistically significant. Conclusions. In dentistry, angular disparities of 15 degrees or greater should be used when tuned-aperture computed tomography is being applied to diagnostic tasks requiring maximal depth discrimination accuracy.
Url:
DOI: 10.1016/S1079-2104(98)90162-7
Affiliations:
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Le document en format XML
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<term>Actual measurements</term>
<term>Algorithms</term>
<term>Alveolar Process (diagnostic imaging)</term>
<term>Analysis of Variance</term>
<term>Angular disparities</term>
<term>Angular disparity</term>
<term>Anova</term>
<term>Apical</term>
<term>Apical region</term>
<term>Apically</term>
<term>Charge coupled device</term>
<term>Confidence intervals</term>
<term>Contrast ratio</term>
<term>Correlation distance</term>
<term>Dentistry</term>
<term>Depth</term>
<term>Depth Perception</term>
<term>Depth discrimination</term>
<term>Digital radiography</term>
<term>Disparity</term>
<term>Endod</term>
<term>Extraction site</term>
<term>Focal spot</term>
<term>Geometry</term>
<term>Horton</term>
<term>Humans</term>
<term>Image Processing, Computer-Assisted (methods)</term>
<term>Image projection</term>
<term>Image quality</term>
<term>Image reconstruction</term>
<term>Imaging</term>
<term>Independent variables</term>
<term>Jaw, Edentulous, Partially (diagnostic imaging)</term>
<term>Linearized</term>
<term>Lingual surfaces</term>
<term>Logarithmic</term>
<term>Logarithmic transformation</term>
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<term>Mandible</term>
<term>Mandible (diagnostic imaging)</term>
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<term>Radiography, Dental (methods)</term>
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<term>Radiol endod</term>
<term>Radiology</term>
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<term>Significant differences</term>
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<term>Steel</term>
<term>Surg</term>
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<term>Task performance</term>
<term>Technique</term>
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<term>Algorithmes</term>
<term>Analyse de variance</term>
<term>Biais de l'observateur</term>
<term>Humains</term>
<term>Mandibule (imagerie diagnostique)</term>
<term>Mâchoire partiellement édentée (imagerie diagnostique)</term>
<term>Perception de la profondeur</term>
<term>Processus alvéolaire (imagerie diagnostique)</term>
<term>Prothèses et implants</term>
<term>Radiographie dentaire ()</term>
<term>Tomodensitométrie ()</term>
<term>Traitement d'image par ordinateur ()</term>
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</keywords>
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<term>Jaw, Edentulous, Partially</term>
<term>Mandible</term>
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<term>Radiography, Dental</term>
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<term>Analysis of Variance</term>
<term>Depth Perception</term>
<term>Humans</term>
<term>Observer Variation</term>
<term>Prostheses and Implants</term>
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<term>Algorithmes</term>
<term>Analyse de variance</term>
<term>Biais de l'observateur</term>
<term>Dispositif CCD</term>
<term>Géométrie</term>
<term>Humains</term>
<term>Maxillaire</term>
<term>Ouverture accordée</term>
<term>Perception de la profondeur</term>
<term>Performance</term>
<term>Profondeur</term>
<term>Projection image</term>
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<term>Radiographie dentaire</term>
<term>Radiographie numérique</term>
<term>Reconstruction image</term>
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<term>Traitement d'image par ordinateur</term>
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<term>Actual measurements</term>
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<term>Angular disparity</term>
<term>Anova</term>
<term>Apical</term>
<term>Apical region</term>
<term>Apically</term>
<term>Confidence intervals</term>
<term>Contrast ratio</term>
<term>Correlation distance</term>
<term>Dentistry</term>
<term>Depth discrimination</term>
<term>Disparity</term>
<term>Endod</term>
<term>Extraction site</term>
<term>Focal spot</term>
<term>Horton</term>
<term>Imaging</term>
<term>Independent variables</term>
<term>Linearized</term>
<term>Lingual surfaces</term>
<term>Logarithmic</term>
<term>Logarithmic transformation</term>
<term>Ludlow</term>
<term>Main effects</term>
<term>Mandible</term>
<term>Oral pathol</term>
<term>Oral surg</term>
<term>Oral surgery</term>
<term>Pathol</term>
<term>Pathology yamamoto</term>
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<term>Projection geometry</term>
<term>Radiol</term>
<term>Radiol endod</term>
<term>Radiology</term>
<term>Reference spheres</term>
<term>Sample size</term>
<term>Significance source</term>
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<front><div type="abstract" xml:lang="en">Abstract: Objective. The purpose of this study was to determine the degree to which the number and angular disparity of component projections influence depth discrimination with tuned-aperture computed tomography. Study design. Groups of three tiny steel spheres served as fiducial references on and in four partially edentulous mandibles. Two spheres were attached to the facial and lingual surfaces of each mandible, and the third was fixed in the apical region of an open tooth socket. Errors in estimates of the depth of the apically positioned sphere relative to the other two spheres were determined from three-dimensional tuned-aperture computed tomography reconstructions. These data were compared with actual measurements produced independently with an optical micrometer. Multiple projections required by the tuned-aperture computed tomography reconstruction algorithm were produced from radially symmetric exposures bearing angular disparities of 5, 15, 30, and 45 degrees. The number of symmetrically dispersed projections per tuned-aperture computed tomography reconstruction likewise was varied systematically (2, 4, 8, 12, and 16 projections). These variables were manipulated through the use of a balanced factorial design. Depth estimates were performed by trained observers; the estimates were based on the determination of tuned-aperture computed tomography slices perceived as imaging the respective apical spheres in sharpest focus. Specimen and observer effects were also considered as independent variables. Resulting data were normalized by logarithmic transformation and analyzed statistically by analysis of variance. Results. Significant differences (p < 0.005) were demonstrated for angular disparity and specimen effects, but the number of projections and the effect of the observer were not found to be statistically significant. Conclusions. In dentistry, angular disparities of 15 degrees or greater should be used when tuned-aperture computed tomography is being applied to diagnostic tasks requiring maximal depth discrimination accuracy.</div>
</front>
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