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Computed tomographic lung density in children
P Vock1, D Malanowski, H Tschaeppeler
1Department of Radiology, University Hospital, Bern, Switzerland.
Insights
Pulmonary density in children varies with age and respiration. Mean lung density (MLD) decreases with age and inspiration, with anteroposterior gradients present at maximal expiration.
Area of Science:
- Medical Imaging
- Pediatric Radiology
- Pulmonary Function
Background:
- Pulmonary density assessment is crucial in pediatric imaging.
- Factors influencing lung density require detailed analysis for accurate interpretation.
Purpose of the Study:
- To investigate the impact of patient age, anatomical location, anteroposterior position, and respiratory phase on pulmonary density in children.
- To establish reference values for mean lung density (MLD) in pediatric populations.
Main Methods:
- Retrospective analysis of 33 children and prospective analysis of 13 children.
- Density standards used for scanner calibration.
- Analysis of lung density at apical, subcarinal, and basal levels during varying respiratory phases.
Main Results:
- MLD in cooperative children (>7 years) was -792 HU (95% range, -702–882 HU).
- MLD decreased with increasing age, with a significant linear regression in the prospective subgroup.
- MLD decreased by 158 HU from maximal expiration to maximal inspiration.
- Anteroposterior density gradients were observed, increasing with expiration.
Conclusions:
- Patient age and respiratory phase significantly affect pulmonary density in children.
- Establishing age- and respiration-specific density standards is important for pediatric lung imaging.
- Findings provide valuable data for the interpretation of chest imaging in pediatric patients.
Abstract:
The effects of patient age, anatomic level, anteroposterior location, and phase of respiration on pulmonary density were analyzed retrospectively in 33 children and prospectively in 13 children. Density standards were positioned on the chest wall for correction of scanner performance changes. The subgroup of 32 children over 7 years of age, ie, with respiratory cooperation, was analyzed separately using moderate inspiration; its mean lung density (MLD) of three levels was -792 HU (95% range, -702-882 HU). Although MLD decreased with increasing age, a significant linear regression was found only in the prospective subgroup. Densities of the apical, subcarinal, and basal levels of the lung were not different. From maximal expiration to maximal inspiration, MLD decreased by 158 HU in the subgroup studied prospectively. Anteroposterior density gradients averaged 56 HU at the subcarinal level and increased with maximal expiration.