A comparison of two compression algorithms and the detection of caries

Objectives: To assess the effect of two compression algorithms (JPEG and wavelet) on the detection of approximal caries. Methods: Fifteen bitewing radiographs were generated using 100 posterior teeth mounted in blocks. The images were produced on conventional films (Ektaspeed Plus) and scanned at 30...

Full description

Saved in:
Bibliographic Details
Main Authors: Janhom A., Van Der Stelt P.F., Sanderink G.C.H.
Format: Article
Language:English
Published: 2014
Online Access:http://www.scopus.com/inward/record.url?eid=2-s2.0-0036654245&partnerID=40&md5=fe0adc41af8e1e0e13213ab85085e181
http://cmuir.cmu.ac.th/handle/6653943832/1034
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Chiang Mai University
Language: English
id th-cmuir.6653943832-1034
record_format dspace
spelling th-cmuir.6653943832-10342014-08-29T09:17:38Z A comparison of two compression algorithms and the detection of caries Janhom A. Van Der Stelt P.F. Sanderink G.C.H. Objectives: To assess the effect of two compression algorithms (JPEG and wavelet) on the detection of approximal caries. Methods: Fifteen bitewing radiographs were generated using 100 posterior teeth mounted in blocks. The images were produced on conventional films (Ektaspeed Plus) and scanned at 300 d.p.i. Digital images were then compressed 9:1 with JPEG and wavelet methods. Nine observers detected the presence and depth of approximal caries recorded on a 5-point confidence scale and a 4-point depth scale from images viewed in random order. Histological examination provided the true depth of the lesions. Data were analysed by means of ANOVA. The null hypothesis was that there is no significant difference between the two compression algorithms and the original uncompressed images. Results: JPEG performed significantly worse than the original and the wavelet algorithm (P<0.001) for the detection of dentinal lesions. However, no significant differences were found for the detection of sound surfaces, enamel lesions, and lesions up to the DEJ between JPEG-compressed images and each of the other two modalities. There was also no significant difference between the wavelet-compressed images and the original for all lesion depths. Conclusions: At a compression ratio of 9:1, there were no significant differences among the original images, JPEG and wavelet compressed images for the detection of enamel caries. JPEG-compressed images performed inferiorly to the original and wavelet-compressed images for the detection of dentinal lesions. Wavelet compression is a better choice than JPEG at the compression ratio investigated in this study. 2014-08-29T09:17:38Z 2014-08-29T09:17:38Z 2002 Article 0250832X 10.1038/sj.dmfr.4600704 12087443 DREAC http://www.scopus.com/inward/record.url?eid=2-s2.0-0036654245&partnerID=40&md5=fe0adc41af8e1e0e13213ab85085e181 http://cmuir.cmu.ac.th/handle/6653943832/1034 English
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
language English
description Objectives: To assess the effect of two compression algorithms (JPEG and wavelet) on the detection of approximal caries. Methods: Fifteen bitewing radiographs were generated using 100 posterior teeth mounted in blocks. The images were produced on conventional films (Ektaspeed Plus) and scanned at 300 d.p.i. Digital images were then compressed 9:1 with JPEG and wavelet methods. Nine observers detected the presence and depth of approximal caries recorded on a 5-point confidence scale and a 4-point depth scale from images viewed in random order. Histological examination provided the true depth of the lesions. Data were analysed by means of ANOVA. The null hypothesis was that there is no significant difference between the two compression algorithms and the original uncompressed images. Results: JPEG performed significantly worse than the original and the wavelet algorithm (P<0.001) for the detection of dentinal lesions. However, no significant differences were found for the detection of sound surfaces, enamel lesions, and lesions up to the DEJ between JPEG-compressed images and each of the other two modalities. There was also no significant difference between the wavelet-compressed images and the original for all lesion depths. Conclusions: At a compression ratio of 9:1, there were no significant differences among the original images, JPEG and wavelet compressed images for the detection of enamel caries. JPEG-compressed images performed inferiorly to the original and wavelet-compressed images for the detection of dentinal lesions. Wavelet compression is a better choice than JPEG at the compression ratio investigated in this study.
format Article
author Janhom A.
Van Der Stelt P.F.
Sanderink G.C.H.
spellingShingle Janhom A.
Van Der Stelt P.F.
Sanderink G.C.H.
A comparison of two compression algorithms and the detection of caries
author_facet Janhom A.
Van Der Stelt P.F.
Sanderink G.C.H.
author_sort Janhom A.
title A comparison of two compression algorithms and the detection of caries
title_short A comparison of two compression algorithms and the detection of caries
title_full A comparison of two compression algorithms and the detection of caries
title_fullStr A comparison of two compression algorithms and the detection of caries
title_full_unstemmed A comparison of two compression algorithms and the detection of caries
title_sort comparison of two compression algorithms and the detection of caries
publishDate 2014
url http://www.scopus.com/inward/record.url?eid=2-s2.0-0036654245&partnerID=40&md5=fe0adc41af8e1e0e13213ab85085e181
http://cmuir.cmu.ac.th/handle/6653943832/1034
_version_ 1681419581022797824