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KMID : 1094020150320040313
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Journal of Veterinary Clinics
2015 Volume.32 No. 4 p.313 ~ p.318
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Correlation of Temporary Lateral Recumbency and Lung Opacity on Ventrodorsal Radiograph
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Lee Hyun-Jik
Jeong Ji-yoon
Choi Woo-shin
Lee Dong-hoon
Lee Young-Jae
Chang Jin-Hwa
Chang Dong-Woo
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Abstract
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The lung opacity on radiography is influenced by various factors. The physical density of the lung and the attenuation ensured on computed tomography (CT) scans is determined by three components : lung tissue, blood, and air. Temporary right lateral recumbency may responsible for the increase of opacity on ventrodorsal projection view. Thus, our aim is to demonstrate that the effect of right lateral recumbency posture on right lung opacity using radiograph and CT scan. In this study, 62 dogs without clinical or radiologic signs of cardiopulmonary disease are selected. Thorax radiographs per 30 seconds for 2 minutes (30s, 60s, 90s, 120s) were performed for 62 dogs. After discussion of the radiographic findings of lung field by two radiologists and a student at Chungbuk national university veterinary medical center a consensus opinion was recorded. Computed tomography per a minute (1 min, 2 min) for 2 minutes were performed for 2 dogs. Mean x-ray attenuation of lung was measured quantitatively using software at two levels (aortic arch and basal level). Among 62 dogs with radiograph comparison, 9.3% of dogs showed influence by postural effect. However, all 2 dogs with computed tomography comparison, showed influence by postural effect. In conclusion, position dependent changes of lung density in CT exam are not consistent with thoracic radiograph.
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KEYWORD
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Lung opacity, Lung density, right lateral recumbency, computed tomography, radiograph
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