The Reproducibility and Accuracy of Cephalometric Analysis Using Different Digital Imaging Modalities and Image Compression PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download The Reproducibility and Accuracy of Cephalometric Analysis Using Different Digital Imaging Modalities and Image Compression PDF full book. Access full book title The Reproducibility and Accuracy of Cephalometric Analysis Using Different Digital Imaging Modalities and Image Compression by Suzanne Elizabeth Cziraki. Download full books in PDF and EPUB format.
Author: Suzanne Elizabeth Cziraki
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
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: Suzanne Elizabeth Cziraki
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
Get Book Here
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 :
Get Book Here
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
Get Book Here
Book Description
Author: Nicholas Grant Playfair
Publisher:
ISBN:
Category :
Languages : en
Pages : 238
Get Book Here
Book Description
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:
Publisher:
ISBN:
Category : Dentistry
Languages : en
Pages : 422
Get Book Here
Book Description
Author: Herman S. Duterloo
Publisher: Quintessence Publishing (IL)
ISBN: 9780867155082
Category : Cephalometry
Languages : en
Pages : 0
Get Book Here
Book Description
History and origin of the structural method -- Validity and reliability : method error -- Interpreting growth and growth patterns -- Interpreting image variation -- Interpreting growth and treatment changes in superimpositions -- Describing growth and treatment changes -- Producing manual structural superimpositions -- Producing computerized structural superimpositions.
Author: Brian M. Mannari
Publisher:
ISBN:
Category : Dental care
Languages : en
Pages : 152
Get Book Here
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: Sunil D. Kapila
Publisher: John Wiley & Sons
ISBN: 1118646592
Category : Medical
Languages : en
Pages : 880
Get Book Here
Book Description
Since its introduction to dentistry, cone beam computed tomography (CBCT) has undergone a rapid evolution and considerable integration into orthodontics. However, despite the increasing popularity of CBCT and progress in applying it to clinical orthodontics, the profession has lacked a cohesive, comprehensive and objective reference that provides clinicians with the background needed to utilize this technology optimally for treating their patients. Cone Beam Computed Tomography in Orthodontics provides timely, impartial, and state-of-the-art information on the indications and protocols for CBCT imaging in orthodontics, clinical insights gained from these images, and innovations driven by these insights. As such, it is the most current and authoritative textbook on CBCT in orthodontics. Cone Beam Computed Tomography in Orthodontics is organized to progress sequentially through specific topics so as to build the knowledgebase logically in this important and rapidly evolving field. Part I provides the foundational information on CBCT technology, including radiation exposure and risks, and future evolutions in computed tomography. Part II presents the Principles and Protocols for CBCT Imaging in Orthodontics, focusing on developing evidence-based criteria for CBCT imaging, the medico-legal implications of CBCT to the professional and the protocols and integration of this technology in orthodontic practice. Part III provides critical information on CBCT-based Diagnosis and Treatment Planning that includes how to interpret CBCT scans, identify incidental pathologies and the possible other uses of this technology. Part IV covers practical aspects of CBCT’s Clinical Applications and Treatment Outcomes that encompasses a range of topics, including root morphology and position, treatment of impacted teeth, virtual surgical treatment planning and outcomes, and more.
Author: Francesco Sardanelli
Publisher: Springer Science & Business Media
ISBN: 8847011337
Category : Medical
Languages : en
Pages : 244
Get Book Here
Book Description
The aim of this book is to present statistical problems and methods in a friendly way to radiologists, emphasizing statistical issues and methods most frequently used in radiological studies (e.g., nonparametric tests, analysis of intra- and interobserver reproducibility, comparison of sensitivity and specificity among different imaging modality, difference between clinical and screening application of diagnostic tests, ect.). The tests will be presented starting from a radiological "problem" and all examples of statistical methods applications will be "radiological".
Author: Mazyar Moshiri
Publisher:
ISBN:
Category : Teeth
Languages : en
Pages : 168
Get Book Here
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.
