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 The scans by 4DMedical allow physicians to detect areas of high and
low lung ventilation using existing equipment in hospitals, said
founder and Chief Executive Andreas Fouras.
The 'four dimensions' refers to the scan's ability to measure the
phases of breath as it passes into and out of the lungs.
"It takes a short video sequence. We use about 20 seconds worth of
video sequence of the patient just breathing naturally," said Fouras.
"From that video sequence, we're able to mathematically calculate
the motion and then the airflow everywhere around the lungs."
The imagery shows evidence of lung damage that cannot be seen on a
CT scan or X-ray, said Dr. Ray Casciari, a pulmonologist at the St.
Joseph Hospital in Orange, California, who serves as 4DMedical's
chief clinical adviser.
The hospital is one of several across the United States where the
technology is being tested.
"The green area is an area of average ventilation and the red that
you see out here is very poor, in fact, no ventilation," said
Casciari, showing a lung image of a COVID pneumonia patient with
symptoms including shortness of breath.
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 The technology uses algorithms and mathematical
models to convert sequences of X-ray images into
quantitative data.
"They do some pretty ordinary imaging... and
then we analyze those images," Fouras said. "We
take that X-ray video, layer our software on top
of that and create the scans."
 The technology is most useful for long COVID
patients who have lung damage, Fouras said.
(Reporting by Omar Younis; Editing by Richard
Chang)
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