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Author: Suzanne Elizabeth Cziraki
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612630017
Category :
Languages : en
Pages : 296
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Book Description
![The Reproducibility and Accuracy of Cephalometric Analysis Using Different Digital Imaging Modalities and Image Compression [microform] PDF](https://books.google.com/books/content/images/frontcover/uYlEjwEACAAJ?fife=w80-h100)
Author: Suzanne Elizabeth Cziraki
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612630017
Category :
Languages : en
Pages : 296
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Book Description
Author: Suzanne Elizabeth Cziraki
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
This study evaluated and compared the reproducibility and accuracy of cephalometric landmarks and measurements between conventional radiographic film and the corresponding indirect, JPEG compressed or direct digital images (DI). Twenty-one conventional films were indirectly digitized using a scanner, and TIFF images were converted to JPEG files using 2 levels of compression (12:1 and 25:1). Simultaneous acquisition of conventional and direct DI (stimulable-storage phosphor (SPP)) was obtained for thirty patients. Three observers for the indirect and one observer for the direct DI identified 17 and 22 landmarks respectively on the computer monitor. X and y-coordinates were recorded and cephalometric measurements calculated. Statistical analysis involved use of the paired samples t-tests and ANOVA models. The results showed that indirect DI have equivalent landmark reproducibility with conventional film. JPEG compression of indirect DI at 25:1 level results in loss in accuracy of cephalometric measurement when compared to non-compressed DI, whereas, JPEG at 12:1 did not. Direct DI were less accurate for 8 out of 21 landmarks but clinical accuracy of cephalometric measurement was equivalent to conventional film.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Nicholas Grant Playfair
Publisher:
ISBN:
Category :
Languages : en
Pages : 238
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AIM: To evaluate the accuracy of current semi-automatic and fully automatic 2D lateral cephalometric analysis programs. MATERIALS AND METHODS: 60 lateral cephalometric radiographs were randomly selected and grouped based their skeletal malocclusions to form 3 equal groups of 20 Class I, 20 Class II and 20 Class III. These radiographs were then analyzed via traditional hand-based analysis. The values obtained from this method of analysis were compared to 4 subsequent methods of analysis. These consisted of semi-automatic analysis using Dolphin Imaging software, semi-automatic analysis using Kodak Orthodontic Imaging software, fully automatic analysis using Kodak Orthodontic Imaging software and fully automatic analysis combined with limited landmark changes using Kodak Orthodontic Imaging software. RESULTS: ICC tests were completed to compare the gold standard hand-based analysis to the 4 subsequent methods. The values obtained from semi-automatic Dolphin and Kodak Orthodontic Imaging software were found to be comparable to hand-based analysis. Whereas, the values obtained from the fully automatic mode of Kodak Orthodontic Imaging software were not found to be comparable to hand-based analysis. CONCLUSIONS: Digital cephalometric programs can be used as an accurate method when performing lateral cephalometric analyses. The fully automatic mode of these programs should only be used as a support to diagnosis and not as a diagnostic tool.
Author: Alexander Jacobson
Publisher: Quintessence Publishing (IL)
ISBN:
Category : Medical
Languages : en
Pages : 326
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Book Description
Accompanying CD-ROM contains ... "an 'average' template and larger and smaller 'normal' templates ... Also provided are instructions for the digital application of the templates to accommodate skulls of all sizes."--Page ix.
Author: Basavaraj Phulari
Publisher: JP Medical Ltd
ISBN: 9350903245
Category : Medical
Languages : en
Pages : 233
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Book Description
Cephalometry is an imaging technique used in orthodontics to measure the size and spatial relationships of the head, jaws and teeth, making use of landmarks or points on the skull. It is used for diagnosis, treatment planning and evaluating dentofacial changes during treatment. This book focuses on understanding the different cephalometric landmarks/points. Beginning with an introduction to the technique and classification of the landmarks, the following chapters explain each point in detail, by section of the head – cranial bones, facial bones and dentition, soft tissue, cervical bones and pharynx. The final sections discuss the different types of imaging used to trace cephalometric landmarks and their applications. Key points Presents technique of cephalometry to diagnose, and plan and evaluate treatment in orthodontics Describes every landmark by section of the head, including abbreviation, definition and applications Compares alternative radiological imaging techniques Includes more than 350 colour images and illustrations
Author: Brian M. Mannari
Publisher:
ISBN:
Category : Dental care
Languages : en
Pages : 152
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Book Description
The purpose of this project was to compare the accuracy and reliability of linear measurements on posterior-anterior (PA) cephalograms made conventionally using photostimulable storage phosphor imaging plates (PSP) and simulated PA cephalometric images from ray sum reconstruction of cone beam computed tomographic (CBCT) volumetric datasets of the same anatomic specimens. The sample consisted of 19 dried dentate human skulls which were imaged using PA cephalometry using PSP imaging plates and three CBCT datasets at 10 s., 20 s. and 40 s. scanning times from which ray sum simulated PA images were produced. Various anatomic landmarks were identified and truth measurements of 13 selected cephalometric linear dimensions were measured directly on the skulls using a high precision caliper. CBCT datasets were imported into a reconstruction program (Dolphin 3D Software) from which ray sum PA images were constructed. Linear cephalometric measurements on PSP and CBCT simulated PA images were performed by one observer using Dolphin Imaging Software. Intraobserver reliability was determined by calculating and comparing Intraclass correlation coefficient. Mean absolute and percentage errors were calculated for each dimension and modality to quantify the reliability error. Mean modality measurements were compared. All other groups were compared using one-way ANOVA with Tukey post hoc comparisons (p [less than or equal to] 0.05). While the ICC was high, PSP cephalometric absolute error was greater than anatomic distances and CBCT image measurements for 8 for 13 measurements. We found that for most measurements, simulated PA images produced from reconstructed CBCT volumetric dataset were accurate and compared well to PSP cephalometric images except for Z-Ag. We also found that PSP cephalometric images consistently underestimated MO-MO dimensions. Measurements on CBCT simulated PA images are more reliabile and as accuracte as PSP cephalometric measurements. The number of projections comprising the reconstructed simulated PA image did not influence reliability or accuracy. Therefore in accordance with ALARA, when CBCT imaging is used to generate simulated PA images, the lowest number of projections are recommended.
Author: Mazyar Moshiri
Publisher:
ISBN:
Category : Teeth
Languages : en
Pages : 168
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Book Description
The purpose of this project was to compare the accuracy and precision of linear measurements made on conventional lateral cephalograms (LC) and simulated LC using cone-beam computed tomography (CBCT) to direct measurements on dentate skulls. The linear distances for 5 mid-sagittal and 4 bilateral measurements between anatomical landmarks on 22 skulls were measured by two observers. The skulls were imaged using a CBCT scanner at 4 scan settings: high resolution (0.2mm) and normal resolution (0.4mm) at 20-sec (306 projections) and 40-sec scans (612 projections). Three simulated LC were generated: Ray sum image reconstructions of the maximum thickness mid-sagittal multiplanar projections, a single frame basis projection, and the scout image. LCs were acquired using a storage phosphor system. Projection images were exported into a cephalometric analysis program and linear measurements determined. Analyses were repeated three times and statistically compared to measured anatomic truth using repeated measures general linear model (p [less than or equal to] 0.05). The mean absolute error was used as an index of precision. While there were statistical differences between skull and modality measurements for 6 of the nine measurements, there were no overall differences between LC and CBCT derived image measurements irrespective of method of construction. CBCT imaging provides clinically reliable 2D simulation images however, dose considerations demand that evidence-based selection criteria should be developed for CBCT in orthodontics that take into account the ALARA principle.
Author: Robert Bracken Godfrey
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
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Author: Andrew Paige
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Since its advent in 1931, analysis of lateral cephalometric radiographs has been an important aspect of orthodontic diagnosis and treatment planning. This type of orthodontic analysis provides a quantitative evaluation of the positions of various anatomical structures of the face, including skeletal, dental, and soft tissue features. Cephalometric analysis, however, is a time-consuming process and is not always performed in clinical practice. Cephalometric analysis from Cone-Beam Computed Tomography (CBCT) imaging is particularly cumbersome, requiring both reconstruction of a two-dimensional lateral cephalogram as well as subsequent computer-assisted tracing analysis using a program such as Dolphin. As the use of CBCT continues to become more prominent in orthodontics, methodologies to expedite cephalometric analysis may be valuable in facilitating their use by clinicians. Several different commercially available (e.g. CephX) and proprietary products have been created to analyze cephalometric radiographs using automated artificial intelligence (AI), but the accuracy of these products remains incompletely established. Our study examined the accuracy and workflow impacts of CephX's ABO analysis directly from CBCT compared to manual reconstruction and tracing by human examiners on 40 CBCT volumes. We hypothesized that automatically generated cephalometric analyses from CBCT volumes would differ significantly from those generated by human examiners, and that workflow time would be statistically significantly decreased in the automated analysis. In contrast, overall workflow time was found to be significantly greater for the CephX software than for the human examiners. Furthermore, our study showed that seven of the eleven measurements in the ABO analysis differed statistically significantly from the human examiners: SNB, ANB, SN-MP, L1-NB, L1-MP, LL to E-Plane, and UL to E-Plane. Nine of the eleven measurements showed average measurement error within clinically acceptable limits, while two showed greater average error than is clinically acceptable - U1-SN and L1-MP were the least accurate measurement in our study. Bland-Altman plots were constructed showing that FMA may show a slight tendency towards greater accuracy at high values, while LL to E-Plane may display a slight tendency to underestimate more frequently at low values and overestimate more frequently at high values. Only one measurement (ANB) showed limits of agreement within the maximum allowed difference; ten out of the eleven variables exceeded the maximum allowed difference. Overall, CephX may offer clinically acceptable performance for most variables in the ABO analysis, but needs further improvement overall, particularly with the inclination of the upper and lower incisors (U1-SN and L1-MP).
