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Temporal Subtraction for the Detection of Hazy Pulmonary Opacities on Chest Radiography

Mitsuko Tsubamoto1, Takeshi Johkoh1, Takenori Kozuka1, Noriyuki Tomiyama1, Seiki Hamada1, Osamu Honda1, Naoki Mihara1, Mitsuhiro Koyama1, Munehiro Maeda1, Hironobu Nakamura1 and Keiichi Fujiwara2

1 Department of Radiology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka, 565-0871, Japan.
2 Mitsubishi Space Software Co., Ltd., Fuji Techno-square, 5-4-36 Tsukaguchi-honmachi, Amagasaki, Hyogo 661-0001, Japan.



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  		Fig. 1A. —54-year-old-man with eosinophilic pneumonia. Radiograph obtained before study shows normal findings.

 


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  		Fig. 1B. —54-year-old-man with eosinophilic pneumonia. Radiograph obtained at time of study shows multifocal hazy pulmonary opacities; however, these findings are difficult to detect without temporal subtraction image.

 


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  		Fig. 1C. —54-year-old-man with eosinophilic pneumonia. Subtraction image obtained from A and B shows multifocal hazy areas of darkening (arrows) on both sides. Note that these opacities are easy to detect with temporal subtraction image.

 


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  		Fig. 1D. —54-year-old-man with eosinophilic pneumonia. High-resolution CT images show ground-glass opacities on both lungs.

 


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  		Fig. 1E. —54-year-old-man with eosinophilic pneumonia. High-resolution CT images show ground-glass opacities on both lungs.

 


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  		Fig. 2A. —Results of detection of ground-glass opacities on chest radiographs by individual board-certified radiologists. Graphs show detection without (A) and with (B) subtraction images.

 


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  		Fig. 2B. —Results of detection of ground-glass opacities on chest radiographs by individual board-certified radiologists. Graphs show detection without (A) and with (B) subtraction images.

 


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  		Fig. 3A. —Results of detection of ground-glass opacities on chest radiographs by individual radiology residents. Graphs show detection without (A) and with (B) subtraction images.

 


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  		Fig. 3B. —Results of detection of ground-glass opacities on chest radiographs by individual radiology residents. Graphs show detection without (A) and with (B) subtraction images.

 

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