Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology
Assessment of image quality in dental radiography, part 1: Phantom validity☆,☆☆,★,★★
Section snippets
Phantom for dental radiography
Fig 1 shows an overview of the phantom.An aluminum block of 12 steps, with 7 holes drilled in each step, was covered by acrylic blocks. The thickness interval of each step was 1 mm. The depth of the 7 holes in each step sequentially increased from 0.05 to 0.35 mm. The thicknesses of the front and back acrylic plates were 10 and 2 mm,
RESULTS
Fig 3 shows the changes of the modified PCs depending on the varying confidence levels in the Ultra-speed film radiographed at 70 kVp.
DISCUSSION
PCs have been used by a number of authors to compare the detectability of radiographic systems.14, 15, 16, 17, 18 PC testing is relatively easy to perform, and reproducible quantitative results can be obtained. Data obtained from such tests provide useful information about the contrast properties of each system.18 The main disadvantage is that these are laboratory tests; the results do not predict clinical diagnostic outcomes. One reason for this seems to be the even thickness of the simple
Acknowledgements
We thank our colleagues in the Department of Oral and Maxillofacial Radiology, who served as observers.
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Cited by (25)
The importance of the ANSI ADA Standard for digital intraoral radiographic systems—a pragmatic approach to quality assurance
2023, Oral Surgery, Oral Medicine, Oral Pathology and Oral RadiologyCitation Excerpt :However, these objects are also ineffective in evaluating digital radiographic image quality for the same reason as for the alligator clip: they do not span the complete dynamic range from full to no attenuation, thereby failing to ensure that the entire dynamic range is acquired. Although the evaluation of noise, SNR, or CNR is also suggested in the evaluation of image quality and optimization,5,6,15-18 there is scant scientific research suggesting that measuring noise is adequate to determine optimal exposure. There is no evidence to suggest that noise above a certain threshold renders the radiograph nondiagnostic.
Evaluation of 4 Commercial Viewing Devices for Radiographic Perceptibility and Working Length Determination
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2012, Japanese Dental Science ReviewCitation Excerpt :As described above a test object used to construct PCs is usually a homogeneous block. An aluminum step phantom with small holes may be used to simulate the clinical radiation contrast range (Fig. 4) [16]. Using this phantom, differences in image quality could be quantitatively evaluated according to the number of visible holes in the radiographs [17].
In vitro perception of low-contrast features in digital, film, and digitized dental radiographs: A receiver operating characteristic analysis
2007, Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology and EndodontologyCitation Excerpt :While there are a number of studies dealing with the comparison of film and digital radiographs with respect to marginal bone level,20 periapical lesions,21 or caries diagnoses,22 there is a dearth of objective ROC-based in vitro perceptibility studies according to literature review. An aluminum step wedge as test phantom was used in the present study, following the phantom design of the well-known “perceptibility curve test” for intraoral radiographic systems.3-8 A major disadvantage of the design was the imbalance between images showing dark spots (18 images) and those showing no spots (5 images), resulting in a prevalence ratio of 0.78/0.22.
Contrast perception in digitized panoramic radiographs compared with their film-based origin
2002, Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and EndodonticsComparison between PAI and quantitative digital radiographic assessment of apical healing after endodontic treatment
2001, Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and EndodonticsCitation Excerpt :The change from one film type to the other was not expected to affect either observer performance or densitometric analysis. Both film types have been found to have similar contrast and sensitometric properties over the useful range of densities,23,24 with no significant difference found between them.25 Both film types have also been shown to have similar ability to detect root resorption.26
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Reprint requests:Kazunori Yoshiura, DDS, PhD,Maidashi 3-1-1,Higashi-ku,Fukuoka 812-8582,Japan
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This work was supported in part through a Grant-in-Aid for Scientific Research (C) from the Japanese Ministry of Education, Science and Culture.
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Department of Oral and Maxillofacial Radiology, Faculty of Dentistry.
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