4Dx Limited -First of it's Kind Lung Imaging Technology, page-6

Biotech Daily – “4DX: ‘XV BEATS PFT, CT FOR LUNG HEALTH’” From Biotech Daily – released Friday, November 1, 2019; 4DX LIMITED 4DX says a 32-patient, 13-month study shows that its XV technology is superior to “gold standard pulmonary diagnostics” to measure lung health. 4DX said the study, titled ‘Novel x-ray velocimetry based quantitative regional lung function analysis to assess risk of radiation-induced pneumonitis and pulmonary fibrosis’, was published in the journal Chest
http://4dx.com/biotech-daily-4dx-xv-beats-pft-ct-for-lung-health/
http://journal.chestnet.org/article/S0012-3692(19)31813-6/fulltext