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KMID : 1103720110650050479
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Journal of the Korean Society of Radiology
2011 Volume.65 No. 5 p.479 ~ p.485
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The Image Quality of a Digital Chest X-Ray Radiography System: Comparison of Quantitative Image Quality Analysis and Radiologists’ Visual Scoring
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Jeon Ho-Sang
Nam Ji-Ho
Chung Myung-Jin
Park Dahl
Kim Won-Taek
Kim Yong-Ho
Ki Yong-Kan
Kim Dong-Hyun
Lee Ju-Hye
Kim Dong-Won
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Abstract
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Purpose:To evaluate the performance of imaging devices, which should be periodically monitored to maintain high quality images to the radiologists. Additionally, this evaluation may prevent patients from radiation over-exposure. The most suitable engineering standard for imaging performance evaluation of digital X-ray thoracic imagers was determined.
Materials and Methods : IEC 62220-1 standards were used to evaluate the performance of the imagers. In succession, the visibilities of overall image, pneumothorax, and humerus head in anthropomorphic thoracic phantom images were used to evaluate the image qualities by radiologists.
Results:The rank correlation coefficient (p) of visual scoring by radiologists with system spatial resolution is not meaningful (p-value, p = 0.295), but is significant with image noise (p-value, p = -0.9267). Finally, the noise equivalent quanta (NEQ) presents a high rank correlation for visual scoring of radiologists (p-value, p = 0.9320).
Conclusion:Image quality evaluation of radiologists were mainly affected by imaging noise. Hence, the engineered standard for evaluating image noise is the most important index to effectively monitor the performance of X-ray imagers. Additionally, the NEQ can be used to evaluate the performance of radiographic systems, because it theoretically corresponds to the synthetic image quality of systems.
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KEYWORD
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Thoracic X-Ray Images , Noise Equivalent Quanta , Modulation Transfer Function , Normalized Noise Power Spectrum
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