Association of x-ray velocimetry (XV) ventilation analysis compared to spirometry

Area of Science:

• Pulmonary Medicine
• Medical Imaging
• Quantitative Physiology

Background:

• Lung function assessment is crucial for diagnosing and managing respiratory diseases.
• Traditional spirometry measures global lung function, potentially missing regional changes.
• X-ray Velocimetry (XV) is an emerging 4D imaging technique for regional ventilation quantification.

Purpose of the Study:

• To evaluate the performance characteristics of XV ventilation analysis.
• To assess the correlation between XV metrics and spirometry.
• To determine the repeatability of XV measurements.

Main Methods:

• XV analysis was performed on 27 patients undergoing thoracic radiotherapy.
• XV metrics (VDP, VH) were compared to spirometry (FEV1, FEV1/FVC) pre- and post-treatment.
• Repeatability was assessed across analysis runs and between breaths.

Main Results:

• XV metrics (VDP, VH) showed significant correlation with spirometry (FEV1, FEV1/FVC).
• XV demonstrated high repeatability with <2% variability within runs and <8% between breaths.
• Case studies highlighted XV's ability to detect lung function changes earlier or more sensitively than spirometry.

Conclusions:

• XV ventilation analysis is a reliable and repeatable method for assessing regional lung function.
• XV offers advantages over spirometry in detecting subtle or early changes in lung health.
• XV is suitable for clinical and research applications, supporting its use in future therapeutic efficacy studies.