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Radiologists vs. Robots: Outperforming AI in Identifying Lung Diseases on Chest X-Rays

September 30, 2023
in Science
Radiologists vs. Robots: Outperforming AI in Identifying Lung Diseases on Chest X-Rays
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Chest X-ray Image

In a recent study published in the journal Radiology, radiologists were found to be more proficient than AI tools in identifying or excluding three common lung diseases from over 2,000 chest X-rays.

Radiologists surpassed AI in accurately detecting three common lung diseases from chest X-rays, as per a study in the Radiology journal. AI tools, while sensitive, produced more false positives, making them less reliable for autonomous diagnoses but useful for second opinions.

In a study of more than 2,000 chest X-rays, radiologists outperformed AI in accurately identifying the presence and absence of three common lung diseases, according to a study published on September 26 in Radiology, a journal of the Radiological Society of North America (RSNA).

The Role of Radiography

“Chest radiography is a common diagnostic tool, but significant training and experience is required to interpret exams correctly,” said lead researcher Louis L. Plesner, M.D., resident radiologist and Ph.D. fellow in the Department of Radiology at Herlev and Gentofte Hospital in Copenhagen, Denmark.

While commercially available and FDA-approved AI tools are available to assist radiologists, Dr. Plesner said the clinical use of deep-learning-based AI tools for radiological diagnosis is in its infancy.

“While AI tools are increasingly being approved for use in radiological departments, there is an unmet need to further test them in real-life clinical scenarios,” Dr. Plesner said. “AI tools can assist radiologists in interpreting chest X-rays, but their real-life diagnostic accuracy remains unclear.”

Artificial Intelligence Tools Representative Chest Radiographs in Six Patients

(A) Posteroanterior chest radiograph in a 71-year-old male patient who underwent examination due to progression of dyspnea shows bilateral fibrosis (arrows) (B) Posteroanterior chest radiograph in a 31-year-old female patient referred for radiography due to month-long coughing shows subtle airspace opacity at the right cardiac border (arrows). (C) Anteroposterior chest radiograph in a 78-year-old male patient referred after placement of a central venous catheter shows a skin fold on the right side (arrow). (D) Posteroanterior chest radiograph in a 78-year-old male patient referred to rule out pneumothorax shows very subtle apical right-sided pneumothorax (arrows). (E) Posteroanterior chest radiograph in a 72-year-old male patient referred for radiography without a specified reason shows chronic rounding of the costophrenic angle (arrow). (F) Anteroposterior chest radiograph in a 76-year-old female patient referred for radiography due to suspicion of congestion and/or pneumonia shows a very subtle left-sided pleural effusion (arrow), which was missed by all three AI tools that were capable of analyzing anteroposterior chest radiographs for pleural effusion. Credit: Radiological Society of North America

Study Findings

Dr. Plesner and a team of researchers compared the performance of four commercially available AI tools with a pool of 72 radiologists in interpreting 2,040 consecutive adult chest X-rays taken over a two-year period at four Danish hospitals in 2020. The median age of the patient group was 72 years. Of the sample chest X-rays, 669 (32.8%) had at least one target finding.

The chest X-rays were assessed for three common findings: airspace disease (a chest X-ray pattern, for example, caused by pneumonia or lung edema), pneumothorax (collapsed lung), and pleural effusion (a buildup of water around the lungs).

AI tools achieved sensitivity rates ranging from 72 to 91% for airspace disease, 63 to 90% for pneumothorax, and 62 to 95% for pleural effusion.

“The AI tools showed moderate to a high sensitivity comparable to radiologists for detecting airspace disease, pneumothorax, and pleural effusion on chest X-rays,” he said. “However, they produced more false-positive results (predicting disease when none was present) than the radiologists, and their performance decreased when multiple findings were present and for smaller targets.”

Comparing Predictive Values

For pneumothorax, positive predictive values—the probability that patients with a positive screening test truly have the disease—for the AI systems ranged between 56 and 86%, compared to 96% for the radiologists.

“AI performed worst at identifying airspace disease, with positive predictive values ranging between 40 and 50%,” Dr. Plesner said. “In this difficult and elderly patient sample, the AI predicted airspace disease where none was present five to six out of 10 times. You cannot have an AI system working on its own at that rate.”

According to Dr. Plesner, the goal of radiologists is to balance the ability of finding and excluding disease, avoiding both significant overlooked diseases and overdiagnosis.

“AI systems seem very good at finding disease, but they aren’t as good as radiologists at identifying the absence of disease especially when the chest X-rays are complex,” he said. “Too many false-positive diagnoses would result in unnecessary imaging, radiation exposure, and increased costs.”

Dr. Plesner said most studies generally tend to evaluate the ability of AI to determine the presence or absence of a single disease, which is a much easier task than real-life scenarios where patients often present with multiple diseases.

“In many prior studies claiming AI superiority over radiologists, the radiologists reviewed only the image without access to the patient’s clinical history and previous imaging studies,” he said. “In everyday practice, a radiologist’s interpretation of an imaging exam is a synthesis of these three data points. We speculate that the next generation of AI tools could become significantly more powerful if capable of this synthesis as well, but no such systems exist yet.”

Concluding Thoughts

“Our study demonstrates that radiologists generally outperform AI in real-life scenarios where there is a wide variety of patients,” he said. “While an AI system is effective at identifying normal chest X-rays, AI should not be autonomous for making diagnoses.”

Dr. Plesner noted that these AI tools could boost radiologists’ confidence in their diagnoses by providing a second look at chest X-rays.

Reference: “Commercially Available Chest Radiograph AI Tools for Detecting Airspace Disease, Pneumothorax, and Pleural Effusion” by Louis Lind Plesner, Felix C. Müller, Mathias W. Brejnebøl, Lene C. Laustrup, Finn Rasmussen, Olav W. Nielsen, Mikael Boesen and Michael Brun Andersen, 26 September 2023, Radiology.
DOI: 10.1148/radiol.231236

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Copyright for syndicated content belongs to the linked Source : SciTechDaily – https://scitechdaily.com/radiologists-vs-robots-outperforming-ai-in-identifying-lung-diseases-on-chest-x-rays/

Tags: Radiologistsrobotsscience
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