Indian Journal of Dental ResearchIndian Journal of Dental ResearchIndian Journal of Dental Research
HOME | ABOUT US | EDITORIAL BOARD | AHEAD OF PRINT | CURRENT ISSUE | ARCHIVES | INSTRUCTIONS | SUBSCRIBE | ADVERTISE | CONTACT
Indian Journal of Dental Research   Login   |  Users online: 999

Home Bookmark this page Print this page Email this page Small font sizeDefault font size Increase font size         

 


 
ORIGINAL RESEARCH Table of Contents   
Year : 2013  |  Volume : 24  |  Issue : 1  |  Page : 98-103
Effects of image enhancement on reliability of landmark identification in digital cephalometry


1 Department of Orthodontics, Member of Orthodontic Research Center, Faculty of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran
2 Department of Oral and Maxillofacial Radiology, Member of Biomaterial Research Center, Faculty of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran

Correspondence Address:
S H Shahidi
Department of Oral and Maxillofacial Radiology, Member of Biomaterial Research Center, Faculty of Dentistry, Shiraz University of Medical Sciences, Shiraz
Iran
Login to access the Email id

Source of Support: The authors thank the vice-chancellery of Shiraz University of Medical Sciences, for supporting the research. Also the authors thank Dr. M.Vossoughi from the Dental Research Development Center, for the statistical analysis, and Dr SH.Hamedani for improving the use of English in the manuscript., Conflict of Interest: None


DOI: 10.4103/0970-9290.114958

Rights and Permissions

Introduction: Although digital cephalometric radiography is gaining popularity in orthodontic practice, the most important source of error in its tracing is uncertainty in landmark identification. Therefore, efforts to improve accuracy in landmark identification were directed primarily toward the improvement in image quality. One of the more useful techniques of this process involves digital image enhancement which can increase overall visual quality of image, but this does not necessarily mean a better identification of landmarks. The purpose of this study was to evaluate the effectiveness of digital image enhancements on reliability of landmark identification. Materials and Methods: Fifteen common landmarks including 10 skeletal and 5 soft tissues were selected on the cephalograms of 20 randomly selected patients, prepared in Natural Head Position (NHP). Two observers (orthodontists) identified landmarks on the 20 original photostimulable phosphor (PSP) digital cephalogram images and 20 enhanced digital images twice with an intervening time interval of at least 4 weeks. The x and y coordinates were further analyzed to evaluate the pattern of recording differences in horizontal and vertical directions. Reliability of landmarks identification was analyzed by paired t test. Results: There was a significant difference between original and enhanced digital images in terms of reliability of points Ar and N in vertical and horizontal dimensions, and enhanced images were significantly more reliable than original images. Identification of A point, Pogonion and Pronasal points, in vertical dimension of enhanced images was significantly more reliable than original ones. Reliability of Menton point identification in horizontal dimension was significantly more in enhanced images than original ones. Conclusion: Direct digital image enhancement by altering brightness and contrast can increase reliability of some landmark identification and this may lead to more accurate cephalometric analysis.


[FULL TEXT] [PDF]*
Print this article     Email this article

 
 Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
  Citation Manager
 Access Statistics
  Reader Comments
  Email Alert *
  Add to My List *
 
 

 Article Access Statistics
    Viewed3272    
    Printed53    
    Emailed1    
    PDF Downloaded142    
    Comments [Add]    
    Cited by others 12    

Recommend this journal