Results 221 to 230 of about 8,956 (252)

Automatic landmarking of cephalograms

Computers and Biomedical Research, 1989
This paper presents an algorithm for automatically locating certain characteristic anatomical points called landmarks on cephalograms (skull X-rays). These landmarks are used by orthodontists in diagnosis and treatment planning. The algorithm uses digital image processing and feature recognition techniques to locate the landmarks.
S, Parthasarathy, S T, Nugent, P G, Gregson, D F, Fay   +3 more
openaire   +2 more sources

Comparison of measurements from photographed lateral cephalograms and scanned cephalograms

American Journal of Orthodontics and Dentofacial Orthopedics, 2007
In this study, we investigated whether a digital photograph of a lateral cephalometric radiograph can produce measurements as accurate as those from a digital image created with a flatbed scanner.Twenty pretreatment lateral cephalograms were randomly selected from the patient files at Chesterfield Royal Hospital. Each radiograph was photographed with a
Jill, Collins, Anwar, Shah, Caroline, McCarthy, Jonathan, Sandler   +3 more
openaire   +2 more sources

Knowledge-Based Landmarking of Cephalograms

Computers and Biomedical Research, 1985
Orthodontists have defined a certain number of characteristic points, or landmarks, on X-ray images of the human skull which are used to study growth or as a diagnostic aid. This work presents the first step toward an automatic extraction of these points. They are defined with respect to particular lines which are retrieved first. The original image is
A D, Lévy-Mandel, A N, Venetsanopoulos, J K, Tsotsos   +2 more
openaire   +2 more sources

Landmark errors on posteroanterior cephalograms

American Journal of Orthodontics and Dentofacial Orthopedics, 2016
It is important to reduce the method errors when evaluating posteroanterior cephalograms to see either small deviations from normal or transverse changes caused by orthodontic treatment. The aim of this study was to determine horizontal and vertical intraexaminer and interexaminer agreement in localization of landmarks in posteroanterior cephalograms ...
Feyza Ulkur, Fulya Ozdemir, Derya Germec-Cakan, E. Cigdem Kaspar   +3 more
openaire   +2 more sources

Landmark identification errors on cone-beam computed tomography-derived cephalograms and conventional digital cephalograms

American Journal of Orthodontics and Dentofacial Orthopedics, 2011
In this study, we investigated the landmark identification errors on cone-beam computed tomography (CBCT)-derived cephalograms and conventional digital cephalograms.Twenty patients who had both a CBCT-derived cephalogram and a conventional digital cephalogram were recruited.
Zwei-Chieng, Chang, Fu-Chang, Hu, Eddie, Lai, Chung-Chen, Yao, Mu-Hsiung, Chen, Yi-Jane, Chen   +5 more
openaire   +2 more sources

Computer-aided automated landmarking of cephalograms

Journal of Orofacial Orthopedics / Fortschritte der Kieferorthop�die, 1998
The computer-aided method presented is able to interpret and measure radiological structures automatically and reproducibly on a large number of randomly selected lateral head films of different film quality. For example the hard and soft tissue expression of the profile is used to discuss method, application and disadvantages.
T, Stamm, H A, Brinkhaus, U, Ehmer, N, Meier, F, Bollmann   +4 more
openaire   +2 more sources

Heritability of nasal characteristics assessed using lateral cephalograms

American Journal of Orthodontics and Dentofacial Orthopedics, 2022
The midface and nasal bones have a significant influence on facial esthetics. Being able to predict the ultimate size of a growing patient's nose may influence the orthodontic treatment plan. Our study aimed to determine whether significant heritability exists between parents and children using multiple soft and hard tissue measurements of nasal ...
Ramandeep, Samra, Ahmed A, Alsulaiman, Melih, Motro, Leslie A, Will   +3 more
openaire   +2 more sources

Landmarking of cephalograms using a microcomputer system

Computers and Biomedical Research, 1990
Landmarks, or certain characteristic reference points, on cephalograms are used as a diagnostic aid employed in treatment planning by orthodontists. This work presents an algorithm for recognizing some anatomical features and locating landmarks on lateral skull X rays (cephalograms) using digital image processing and feature recognition techniques.
W, Tong, S T, Nugent, P H, Gregson, G M, Jensen, D F, Fay   +4 more
openaire   +2 more sources

Improving cephalogram analysis through feature subimage extraction

IEEE Engineering in Medicine and Biology Magazine, 1999
An MLP with a GA was proposed to extract feature subimages containing orthodontic landmarks. Simulated images and cephalograms were used to investigate its performance in comparison with the cross-correlation method. From the results of simulated image containing shapes with different geometrical conditions, it was shown that the fault tolerance of the
Y T, Chen, K S, Cheng, J K, Liu
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Characteristics of digital cephalograms and film/screen cephalograms: a comparative study

American Journal of Orthodontics and Dentofacial Orthopedics, 2002
observers for the indirect and 1 observer for the direct DIs identified 17 and 22 landmarks, respectively, on the computer monitor. X and y coordinates were recorded, and cephalometric measurements were calculated. Statistical analysis included paired-sample t tests and ANOVA models.
openaire   +1 more source