Contrast reference values in panoramic radiographic images using an arch-form phantom stand.
10.5624/isd.2016.46.3.203
- Author:
Jae Myung SHIN
1
;
Chena LEE
;
Jo Eun KIM
;
Kyung Hoe HUH
;
Won Jin YI
;
Min Suk HEO
;
Soon Chul CHOI
;
Sam Sun LEE
Author Information
1. Department of Oral and Maxillofacial Surgery, Ilsan Paik Hospital, Inje University College of Medicine, Goyang, Republic of Korea.
- Publication Type:Original Article
- Keywords:
Radiography, Panoramic;
Quality Assurance, Health Care;
Phantoms, Imaging
- MeSH:
Aluminum;
Bicuspid;
Dental Porcelain;
Diagnosis;
Incisor;
Jaw;
Molar;
Phantoms, Imaging;
Polymethyl Methacrylate;
Polytetrafluoroethylene;
Quality Assurance, Health Care;
Radiography, Panoramic;
Reference Values*;
Skull;
Temporomandibular Joint
- From:Imaging Science in Dentistry
2016;46(3):203-210
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: The purpose of this study was to investigate appropriate contrast reference values (CRVs) by comparing the contrast in phantom and clinical images. MATERIALS AND METHODS: Phantom contrast was measured using two methods: (1) counting the number of visible pits of different depths in an aluminum plate, and (2) obtaining the contrast-to-noise ratio (CNR) for 5 tissue-equivalent materials (porcelain, aluminum, polytetrafluoroethylene [PTFE], polyoxymethylene [POM], and polymethylmethacrylate [PMMA]). Four panoramic radiographs of the contrast phantom, embedded in the 4 different regions of the arch-form stand, and 1 real skull phantom image were obtained, post-processed, and compared. The clinical image quality evaluation chart was used to obtain the cut-off values of the phantom CRV corresponding to the criterion of being adequate for diagnosis. RESULTS: The CRVs were obtained using 4 aluminum pits in the incisor and premolar region, 5 aluminum pits in the molar region, and 2 aluminum pits in the temporomandibular joint (TMJ) region. The CRVs obtained based on the CNR measured in the anterior region were: porcelain, 13.95; aluminum, 9.68; PTFE, 6.71; and POM, 1.79. The corresponding values in the premolar region were: porcelain, 14.22; aluminum, 8.82; PTFE, 5.95; and POM, 2.30. In the molar region, the following values were obtained: porcelain, 7.40; aluminum, 3.68; PTFE, 1.27; and POM, - 0.18. The CRVs for the TMJ region were: porcelain, 3.60; aluminum, 2.04; PTFE, 0.48; and POM, - 0.43. CONCLUSION: CRVs were determined for each part of the jaw using the CNR value and the number of pits observed in phantom images.
