Contrast reference values in panoramic radiographic images using an arch-form phantom stand
Imaging Science in Dentistry
;
: 203-210, 2016.
Article
in English
| WPRIM
| ID: wpr-126683
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 ANDMETHODS:
Phantom contrast was measured using twomethods:
(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.
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Polytetrafluoroethylene
/
Quality Assurance, Health Care
/
Reference Values
/
Skull
/
Temporomandibular Joint
/
Bicuspid
/
Radiography, Panoramic
/
Phantoms, Imaging
/
Polymethyl Methacrylate
/
Dental Porcelain
Type of study:
Diagnostic study
Language:
English
Journal:
Imaging Science in Dentistry
Year:
2016
Type:
Article
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