AI system more accurately identifies collapsed lungs using chest x-rays

Wednesday, October 16, 2019

New assistive technology can diagnose collapsed lungs from chest x-rays with a higher degree of accuracy than radiologists.

The system, developed at the University of Waterloo, uses artificial intelligence (AI) software to search a huge database of x-ray images with known diagnoses for comparison to x-rays of new patients with unknown conditions.

That approach enables researchers to identify 75 per cent of cases of collapsed lungs, or pneumothorax. On average, medical specialists diagnose fewer than 50 per cent of cases when chest x-rays are used.


X-ray showing collapsed lung                X-ray showing a normal lung

“Our results are very exciting,” said Antonio Sze-To, a postdoctoral fellow at Waterloo. “The AI we use works almost like magic - and it will help radiologists save lives.”

Pneumothorax occurs when air gets between the chest wall and the outside of a lung, causing pain and symptoms such as shortness of breath. If left undiagnosed and untreated, it can suddenly deteriorate and cause death.

Hamid Tizhoosh, a professor of systems design engineering and director of the Laboratory for Knowledge Inference in Medical Image Analysis (KIMIA Lab), said the most serious cases of collapsed lung are relatively easy for experienced radiologists to diagnose from x-rays.

Minor cases are extremely challenging to spot, however, resulting in missed diagnoses that put up to 50 per cent of patients at risk.

“We spend a lot of time, energy and resources needlessly investigating other possible causes of the same symptoms and people suffer in the meantime,” Tizhoosh said.

Researchers are working with the University Health Network (UHN), a healthcare and medical research organization consisting of several Toronto-area hospitals, on a project backed by the Vector Institute, a not-for-profit corporation dedicated to advancing AI.

The goal is to increase the accuracy of the technology to over 90 per cent and integrate it next year into a software system, Coral Review, developed and used at UHN-affiliated hospitals. If successful at UHN, it would be offered to other hospitals now using the system.

Coral, a quality assurance tool, allows doctors to provide second opinions by reviewing medical imaging diagnoses made by their peers.

“We’re very excited about the collaboration with the University of Waterloo and the Vector Institute,” said Leon Goonaratne, Senior Director at UHN Digital.   “It’s an opportunity to further improve the quality process we’ve implemented at hospitals across the province."

The new AI software searches a database of more than 550,000 x-rays - including 30,000 cases of collapsed lungs - for those most similar to a new patient’s x-rays.

If the known condition in the majority of the similar x-rays is collapsed lung, the AI recommends collapsed lung as the diagnosis in the new case.

“There is no question systems like this will be in place in hospitals within the next two years,” Tizhoosh said. “People are pushing for it and the technology is there.”

The system could offer radiologists a “computational second opinion” in Coral, or be used to prioritize the x-rays busy specialists look at first, reducing treatment delays that also put patients at risk.

In addition to pneumothorax, there are plans to apply the core AI search system to numerous other conditions -  including pneumonia and chronic obstructive pulmonary disease (COPD) - that are diagnosed using chest x-rays.

Researchers will present their work on chest x-rays and pneumothorax at the Vector Institute’s Evolution of Deep Learning Symposium in Toronto this week.

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