Detalhes bibliográficos
| Ano de defesa: |
2008 |
| Autor(a) principal: |
Duarte, Hená Elizeth Meireles
 |
| Orientador(a): |
Sannomiya, Eduardo Kazuo |
| Banca de defesa: |
Não Informado pela instituição |
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Metodista de São Paulo
|
| Programa de Pós-Graduação: |
PÓS GRADUAÇÃO EM ORTODONTIA
|
| Departamento: |
Ortodontia
|
| País: |
BR
|
| Palavras-chave em Português: |
|
| Área do conhecimento CNPq: |
|
| Link de acesso: |
http://tede.metodista.br/jspui/handle/tede/1260
|
Resumo: |
The photo-stimulable storage phosphor imaging plates sistem shows the images in the computer screen as a DICOM (digital image and comunication in medicine) format. This kind of imaging format uses a lot of memory space in the computer hard disc what turns its storage and file trasmition in the internet a dificult task. The aim of this study was to evaluate the efect of the JPEG compression in different qualities factors (100, 80 and 60) in the reproducibility of cephalometric points in lateral teleradiographies comparing with DICOM images. The sample of the study consistes of 120 digital lateral teleradiographies obtained from 30 individuals, in DICOM format. These images were converted in JPEG format. Three dentists expertized in orthodontist were calibrated and then were oriented to mark cephalometric points em each image using the XY coordinates system after random and blind the sample. This was repeated one month later. Intra-observer and interobserver reproducibility was calculated using the intra-class correlation test. Differences between the compression ratios were assessed using a one-way analysis of variance. The results showed that the points marcations were reproductible, except to the Orbital point in the X coordinate. The statisc analyse showed no difference between the files formats to each point and axis. The different JEPG qualities compression factors studied (100, 80 and 60) did not affected the reproducibility in cephalometric points marcation tested. |
