scholarly journals Numerical Evaluation of Image Contrast for Thicker and Thinner Objects among Current Intraoral Digital Imaging Systems

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Oyunbat Dashpuntsag ◽  
Midori Yoshida ◽  
Ryosuke Kasai ◽  
Naoki Maeda ◽  
Hidehiko Hosoki ◽  
...  
Keyword(s):  
Digital Imaging ◽  
Imaging Systems ◽  
Diagnostic Purpose ◽  
Metallic Material ◽  
Low Contrast ◽  
Photostimulable Phosphor ◽  
Phosphor Plate ◽  
Digital Imaging Systems ◽  
Photostimulable Phosphor Plate ◽  
Small Bone

The purpose is to evaluate the performance of current intraoral digital detectors in detail using a precise phantom and new method. Two aluminum step wedges in 0.5 mm steps were exposed by two photostimulable phosphor plate (PSP) systems—one with automatic exposure compensation (AEC) and the other without AEC—and a CCD sensor. Images were obtained with 3 doses at 60 kV. The effect of metallic material also was evaluated. The contrast-to-noise ratio (CNR) for thinner steps and the low contrast value (LCV) for thicker steps were obtained. The CCD system was the best under all conditions (P<0.001), although the Gray value was sensitive to the dose, and the Gray value-dose relation varied greatly. The PSP system with AEC was superior to that without AEC for the LCV (P<0.001) but was inferior to it regarding the CNR (P<0.001). CNR and LCV in the PSP system without AEC were not affected by the metallic plate. Intraoral digital imaging systems should be chosen according to their diagnostic purpose. PSP system with AEC may be the best for detecting molar proximal caries, whereas the PSP system without AEC may be better for evaluating small bone regeneration in periodontal disease. The CCD system provided the best performance.

Digital imaging and quantitative image analysis of polymer blends

1996 ◽  
Vol 54 ◽  
pp. 170-171
Author(s):  
Xiao Zhang
Keyword(s):  
Digital Imaging ◽  
Imaging Techniques ◽  
Imaging Systems ◽  
Polymer Science ◽  
Key Factors ◽  
Multiple Imaging ◽  
Quantitative Image ◽  
Digital Imaging Systems ◽  
Multi Phase ◽  
Network Technologies

Polymer microscopy involves multiple imaging techniques. Speed, simplicity, and productivity are key factors in running an industrial polymer microscopy lab. In polymer science, the morphology of a multi-phase blend is often the link between process and properties. The extent to which the researcher can quantify the morphology determines the strength of the link. To aid the polymer microscopist in these tasks, digital imaging systems are becoming more prevalent. Advances in computers, digital imaging hardware and software, and network technologies have made it possible to implement digital imaging systems in industrial microscopy labs.

Analysis of vocal fold vibration on prosodic events by high speed digital imaging systems

2002 ◽  
Vol 112 (5) ◽  
pp. 2445-2445
Author(s):  
Masanobu Kumada ◽  
Noriko Kobayashi ◽  
Hajime Hirose ◽  
Niro Tayama ◽  
Hiroshi Imagawa ◽  
...  
Keyword(s):  
Digital Imaging ◽  
Vocal Fold ◽  
High Speed ◽  
Imaging Systems ◽  
Vocal Fold Vibration ◽  
Digital Imaging Systems

Benefits of using a photostimulable phosphor plate protective device

2021 ◽  
pp. 20200339
Author(s):  
Graziela de Moura ◽  
Mariana Boessio Vizzotto ◽  
Priscila Fernanda da Silveira Tiecher ◽  
Nádia Assein Arús ◽  
Heraldo Luis Dias da Silveira
Keyword(s):  
Image Quality ◽  
Compressive Load ◽  
Control Group ◽  
Protective Device ◽  
Photostimulable Phosphor ◽  
Plate Size ◽  
Phosphor Plate ◽  
Photostimulable Phosphor Plate ◽  
Post Hoc ◽  
Gray Values

Objectives: To develop and test a protective device (PD) to increase the resistance of photostimulable storage phosphor (PSP) plate to compressive load, and assess the resulting image quality. Methods: Two prototypes, polyvinylchloride sheets of 0.3 mm and 0.7 mm each, were developed for PSP plate size 2. The resistance to compressive load was tested using eight new PSPs divided into four test groups: (1) PSP, (2) PSP and paperboard protector, (3) PSP and 0.3 mm PD, and (4) PSP and 0.7 mm PD. The resulting images were analyzed by three oral radiologists, based on the consensus for image artifacts. Additionally, the objective image quality test was performed with four new PSPs, using an 8-step wedge aluminum scale. The mean gray values and standard deviation were measured in a total of 240 images, and the data were analyzed using analysis of variance with Bonferroni post-hoc test. Results: Artifacts were seen in the PSP control group starting at 40 n, and at 150 n, 175 n and 300 n in 0.3 mm PD, paperboard protector and 0.7 mm PD, respectively. Although there was no statistical difference among groups, there were differences between exposure times (0.06–0.25 s, 0.06–0.40 s, and 0.10–0.40 s). Scanning resolution of 20 lp/mm showed higher mean gray value than 25 and 40 lp/mm (p < 0.05) Conclusion: The developed PDs improved the PSP resistance to compressive forces, with low interference on the pixel gray values, regardless of exposure time and spatial resolution. Nevertheless, the 0.7 mm PD could withstand the maximum compressive load.

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