The Analysis of the Image Quality of Chest Radiographs : The Image Analysis for the Practical Density Region

Okada, Hirosuke; Usami, Kimio; Kuramata, Yuichi; Miyata, Kaeko; Murano, Yoshihiko; Wakamatsu, Takashi; Yamashita, Kazuya

doi:10.6009/jjrt.kj00001361965

Nippon Hoshasen Gijutsu Gakkai Zasshi

1988

DOI: 10.6009/jjrt.kj00001361965

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The Analysis of the Image Quality of Chest Radiographs : The Image Analysis for the Practical Density Region

Hirosuke Okada

Kimio Usami

Yuichi Kuramata

et al.

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Optimization of Histogram Analysis for Pediatric Digital Chest Radiography Using Flat Panel Detector System

登喜生¹,

隆司²,

忠久³

et al. 2009

Nippon Hoshasen Gijutsu Gakkai Zasshi

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Optical density of the lung area in pediatric digital chest radiography using an indirect flat panel detector (FPD) system were changed enormously by the influence of such factors as the size of lung area, gas of retroperitoneum, and so on. Our purpose in this study was to improve the stability of lung density on output images by means of optimizing histogram analysis. Chest images of a lung phantom were taken at various X-ray tube voltages and processed using a half-type region of interest (ROI) for the lung area. The shape of the histogram obtained by two different calculation methods including frequency distribution and cumulative relative frequency were compared, and digital chest images of 110 clinical cases in our hospital were classified into three age-groups (under 6 years old, over 6 years old and under 13 years old, and over 13 years old) and their histograms were analyzed. In conclusion, it was important that to analyze the histograms of age-groups, a cumulative relative frequency histogram should be used because the influence of X-ray tube voltage was lower than the frequency distribution histogram, and stabilized lung density under 6 years old could be obtained if the value of the imaging parameter for lung density from default was 90% to 85% or 80% because the distribution of lung area and its center value were significantly lower than in those over 13 years old.

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Optimization of Histogram Analysis for Pediatric Digital Chest Radiography Using Flat Panel Detector System

登喜生¹,

隆司²,

忠久³

et al. 2009

Nippon Hoshasen Gijutsu Gakkai Zasshi

View full text Add to dashboard Cite

show abstract

Comparison of Detectability of Liquid Crystal Displays (LCDs) and Film Using Phantoms of Small Adenocarcinomas as Abnormalities

安雄¹,

慎司²,

正彦³

et al. 2011

Nippon Hoshasen Gijutsu Gakkai Zasshi

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SummaryFollowing the trend of the digitalization of the modalities used for diagnostic imaging, the devices for such imaging have increasingly included monitors. The present study was undertaken to evaluate the usefulness of soft-copy (liquid crystal display; LCD) images of phantoms of small adenocarcinomas using receiver operating characteristic (ROC) analysis of two different display systems: LCD and hard copy (film). A twotailed paired t-test and the jackknife method (parametric methods) were performed, and no significant differences were found in the area under the ROC curve (AUC) for the pulmonary fields, lungs, ribs, or mediastinum between the film and LCD display systems, and the detectability did not differ between the film and LCD monitors. A Mann-Whitney U test, which is a non-parametric method that applies to the analysis of a small sample, also showed no significant differences in the AUC. The results of this study suggest that LCDs can replace hard-copy film as a display system if the signals.

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The Analysis of the Image Quality of Chest Radiographs : The Image Analysis for the Practical Density Region

Cited by 2 publications

References 0 publications

Optimization of Histogram Analysis for Pediatric Digital Chest Radiography Using Flat Panel Detector System

Optimization of Histogram Analysis for Pediatric Digital Chest Radiography Using Flat Panel Detector System

Comparison of Detectability of Liquid Crystal Displays (LCDs) and Film Using Phantoms of Small Adenocarcinomas as Abnormalities

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