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We present a robust technique for calculating regional volume changes withinthe lung from X-ray radiograph sequences captured during ventilation, withoutthe use of computed tomography (CT). This technique is based on the change intransmitted X-ray intensity that occurs for each lung region as air displacesthe attenuating lung tissue. Lung air volumes calculated from X-ray intensitychanges showed a strong correlation ($R^2$=0.98) against the true volumes,measured from high-resolution CT. This correlation enables us to accuratelyconvert projected intensity data into relative changes in lung air volume. Wehave applied this technique to measure changes in regional lung volumes fromX-ray image sequences of mechanically ventilated, recently-deceased newbornrabbits, without the use of CT. This method is suitable for biomedical researchstudies and shows potential for clinical application.

Accurate measures of regional lung air volumes from chest X-rays of small animals