Reference values and postural effects on pulmonary perfusion in dynamic chest radiography.

Area of Science:

• Radiology and Imaging
• Pulmonary Medicine
• Medical Physics

Background:

• Dynamic Chest Radiography (DCR) is an emerging non-invasive technique for assessing pulmonary perfusion.
• A semi-quantitative method for evaluating perfusion distribution has been developed to increase DCR's clinical applicability.

Purpose of the Study:

• To establish reference values for pulmonary perfusion distribution using DCR in healthy volunteers.
• To investigate alterations in pulmonary perfusion distribution due to changes in body posture (standing vs. supine).

Main Methods:

• Forty-five healthy volunteers underwent DCR in both standing and supine positions.
• The lungs were anatomically divided into six regions (upper, middle, and lower zones for each lung).
• Pulmonary perfusion percentage was quantified for each lung region in both postures.

Main Results:

• Significant differences in pulmonary perfusion distribution were observed between standing and supine positions.
• Perfusion measurements showed notable variations across the six lung regions in both postures.
• A statistically significant shift of pulmonary perfusion towards the upper lung zones was detected when volunteers moved from a standing to a supine position (P < 0.001).

Conclusions:

• Reference values for normal pulmonary perfusion distribution using DCR in standing and supine positions have been successfully established.
• The study confirms significant postural influences on pulmonary perfusion distribution.
• These established normal values are crucial for identifying subtle abnormalities or atypical perfusion shifts in clinical practice.