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Bronchoarterial Ratio and Bronchial Wall Thickness on High-Resolution CT in Asymptomatic Subjects: Correlation with Age and Smoking

Shin Matsuoka1,2, Katsuhiro Uchiyama1, Hideki Shima1, Naoyuki Ueno1, Sonomi Oish1 and Yoko Nojiri1

1 Department of Radiology, Teikyo University School of Medicine, Ichihara Hospital, 3426-3, Anesaki Ichihara Chiba 299-0111, Japan.
2 Present address: Department of Diagnostic Radiology, Fujisawa City Hospital, 2-6-1, Fujisawa, Fujisawa-shi Kanagawa 251-8550, Japan.



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  		Fig. 1. —Graph shows relationship between age and bronchoarterial ratio (defined as diameter of bronchial lumen divided by diameter of its accompanying artery). Relationship between these two measurements is significant (r = 0.768, p < 0.0001).

 


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  		Fig. 2. —High-resolution CT scan obtained in lower lobe of lung at window width of 1500 H and window level of -450 H in 28-year-old man shows that bronchoarterial ratio at posterior basal segment (arrow) is 0.615.

 


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  		Fig. 3. —High-resolution CT scan obtained in lower lobe at window width of 1500 H and window level of -450 H in 72-year-old man shows that bronchoarterial ratio at basal segment (arrow) is 0.811. Bronchoarterial ratio is greater in elderly.

 


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  		Fig. 4. —Graph shows relationship between age and T/D ratio (defined as wall thickness [T] divided by total diameter of bronchus [D]). No significant relationship was seen between these two measurements (p = 0.121)

 

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