Home About us Editorial board Search Ahead of print Current issue Archives Submit article Instructions Contacts Login 
Home Print this page Email this page Users Online: 219

ORIGINAL ARTICLE
Year : 2015  |  Volume : 3  |  Issue : 2  |  Page : 39-43

Fractal dimension of the mandibular trabecular bone measured on digital and digitized images


1 Department of Oral Diagnosis and Surgery, Araraquara Dental School, São Paulo State University - UNESP, Araraquara, SP, Brazil
2 Department of Public Health, Araraquara Dental School, São Paulo State University - UNESP, Araraquara, SP, Brazil

Correspondence Address:
Dr. Matheus Lima Oliveira
Rua Humaitá 1680, 14801-903 - Araraquara - SP
Brazil
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2321-3841.157519

Rights and Permissions

Aims: This study compared fractal dimension (FD) values on mandibular trabecular bone in digital and digitized images at different spatial and contrast resolutions. Materials and Methods: 12 radiographs of dried human mandibles were obtained using custom-fabricated hybrid image receptors composed of a periapical radiographic film and a photostimulable phosphor plate (PSP). The film/PSP sets were disassembled, and the PSPs produced images with 600 dots per inch (dpi) and 16 bits. These images were exported as tagged image file format (TIFF), 16 and 8 bits, and 600, 300 and 150 dpi. The films were processed and digitized 3 times on a flatbed scanner, producing TIFF images with 600, 300 and 150 dpi, and 8 bits. On each image, a circular region of interest was selected on the trabecular alveolar bone, away from root apices and FD was calculated by tile counting method. Two-way ANOVA and Tukey's test were conducted to compare the mean values of FD, according to image type and spatial resolution (α = 5%). Results: Spatial resolution was directly and inversely proportional to FD mean values and standard deviation, respectively. Spatial resolution of 150 dpi yielded significant lower mean values of FD than the resolutions of 600 and 300 dpi (P < 0.05). A nonsignificant variability was observed for the image types (P > 0.05). The interaction between type of image and level of spatial resolution was not significant (P > 0.05). Conclusion: Under the tested, conditions, FD values of the mandibular trabecular bone assessed either by digital or digitized images did not change. Furthermore, these values were influenced by lower spatial resolution but not by contrast resolution.


[FULL TEXT] [PDF]*
Print this article     Email this article
 Next article
 Previous article
 Table of Contents

 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 *
 * Requires registration (Free)
 

 Article Access Statistics
    Viewed3389    
    Printed110    
    Emailed0    
    PDF Downloaded501    
    Comments [Add]    

Recommend this journal