SAN MATEO, Calif.--(BUSINESS WIRE)--May 21, 2025--
RapidAI, the gold standard and global leader in neurovascular AI-based clinical decision support and enterprise radiology solutions, today announced new study findings that underscore its continued leadership in stroke imaging. The findings emphasize that not all AI is created equal, with results showing that RapidAI’s clinically deep algorithms deliver superior accuracy in detecting medium vessel occlusions (MeVOs) compared to Viz.ai.
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The data, presented as a late-breaking abstract at the European Stroke Organisation Conference (ESOC) 2025, analyzed 1,591 consecutive stroke cases at a comprehensive stroke center. Of the 1,122 eligible cases, RapidAI detected 93% (109) of MeVOs using CT Perfusion alone, compared to 70% (82) by Viz.ai.
“CT Perfusion is a powerful tool, but its full value is only realized when paired with high-performing software, especially in complex cases with smaller occlusions like MeVOs,” said Harmeet Sachdev, MD, lead investigator and neurologist. “RapidAI consistently identified more occlusions than Viz in this study, echoing what we saw in the DUEL study with large vessel occlusions. The story the data tells is clear: not all imaging tools are equally equipped to interpret complex stroke cases.”
MeVOs refer to occlusions in smaller, yet still crucial, arteries in the brain, such as the M2/M3 segments of the middle cerebral artery or the A1/A2 and P1/P2 segments of the anterior and posterior cerebral arteries. These blockages can cause severe damage if left untreated but are notoriously difficult to identify without high-performing imaging tools. The substantial number of MeVOs missed by the Viz.ai software could lead to significant delays in diagnosis and treatment.
The accuracy of Rapid CT and MR perfusion imaging for estimating core and penumbra has been extensively validated in the landmark clinical trials of DEFUSE 2, SWIFT PRIME, EXTEND-IA, and DEFUSE 3. RapidAI is the only software demonstrated to predict the subsequent infarct volume based on initial perfusion imaging. In addition, RapidAI is the only perfusion software with an FDA indication for selecting patients for mechanical thrombectomy.
“These real-world clinical findings validate what sets RapidAI apart. Deeper clinical algorithms that not only detect more but empower providers with greater clarity and confidence,” said David Stoffel, MD, chief business officer at RapidAI. “Accurate perfusion imaging is essential for identifying subtle but serious strokes. Without it, critical cases can go unrecognized, delaying treatment when every minute counts.”
The study, titled “AI Detection of Medium Vessel Occlusions: Evaluating Performance of RapidAI vs Viz.ai CT Perfusion in 1,591 Consecutive Code Strokes”, was presented at ESOC 2025.
About RapidAI
RapidAI is the world leader in AI-driven medical imaging analysis and coordinated care. With the industry’s most validated clinical AI platform, we empower care teams to rapidly, precisely, and confidently manage life-threatening conditions. Trusted by thousands of hospitals in 100+ countries, RapidAI delivers the deepest level of clinical decision support on the market to help accelerate the time to treatment and enhance patient outcomes. We go beyond the algorithm to drive care team collaboration and efficiencies that expand access to life-saving interventions. At RapidAI, we establish new standards for care teams and the patients they treat.
Example of a radiologist confirmed M2 occlusion correctly identified by RapidAI CTP (left) and missed by Viz.ai CTP (right)
Nichole Sims started using a tanning bed at 15 because she said everyone around her was doing it, especially before events like homecoming dances and prom.
Eight years later, she was diagnosed with melanoma — a potentially life-threatening skin cancer.
During that time, Sims has seen tanning become even more popular among young people online. She tries to counter the misinformation on social media that touts tanning as a mood booster and beauty requirement by sharing her own experience.
“I just feel like our generation doesn’t really look into a lot of risks. They just kind of live in the moment," Sims said.
Experts are concerned about a resurgence in the popularity of tanning among young adults as social media has helped tanning in general make a comeback. A video of a girl sharing her “tanning secrets” and showing off a bikini tan line has racked up more than 11 million views, while people in the comments joke, “The earth probably won't last long anyway, I'd rather go out tan than pale.”
More than 100,000 new melanomas will be diagnosed in the U.S. in 2026, and about 8,500 people are expected to die from melanoma, according to the American Cancer Society. Even more worrisome, some influencers are encouraging the use of tanning beds.
“Being young in the world we live in now, being tan and pretty, it goes together,” Sims said.
Dr. Pedram Gerami and his team at Northwestern University’s medical school sought to find out what was happening at a cellular level with tanning bed users. They had nearly three times the risk of developing melanoma as those who did not use tanning beds.
Gerami took skin samples from tanning bed users and compared them with samples from nonusers. His team examined the DNA sequences of melanocytes, skin cells that can turn into moles, melanoma or other cancers.
When melanocytes are exposed to UV light, they can mutate. Tanning beds can emit more than 10 times as much UV light as the sun.
The DNA mutation rate of melanocytes in tanning bed users was more than double that of nonusers whose only exposure to UV is outdoor sun, Gerami said.
“You only need like two or three (mutations) in the right place for it to turn into a melanoma,” Gerami said. “If you get one or two of them from the tanning bed use … it kind of just primes all these cells to be ready and that much closer to getting to melanoma.”
Gen Z adults are less informed about sun protection and more likely to believe misconceptions about tanning, according to a 2025 survey by the American Academy of Dermatology.
More than one-fifth of young adults said they prioritized getting a tan over protecting their skin and more than half believed common myths like having a “base tan” would protect against sunburn, the survey results said.
Some videos on TikTok ridicule warnings by experts that unprotected UV exposure can lead to increased risk for skin cancer, including falsely saying that sunscreen can cause cancer, too. Others urge people to tan outside when the UV index is the highest, when experts advise the public to avoid sun exposure.
“Tanning is sort of cool again … and all the education about skin cancer and skin aging is sort of taking a backseat for the younger generation,” said Dr. Anthony Rossi, a dermatologist at Memorial Sloan Kettering Cancer Center.
Rossi said he recalls using tanning beds when he was younger and understands the appeal, but years after he stopped using them, he developed a non-melanoma skin cancer, he said.
“There’s really no such thing as a safe tan,” he said.
The World Health Organization has long classified tanning beds as a cancer-causing agent in the same category as tobacco and asbestos.
Using tanning beds before age 20 can increase your chances of developing melanoma by 47%, according to the American Academy of Dermatology.
California became the first state to ban tanning beds for minors in 2012. More than a dozen states have followed suit since, and many others require in-person parental consent.
But the U.S. Food and Drug Administration withdrew a proposed rule in March that would have barred anyone under 18 years old from using tanning beds in the U.S. The rule was first introduced in 2015.
The FDA said it withdrew the rule in light of “concerns regarding possible unintended consequences" in its memo, drawing concern from experts that the action could send mixed messages to the public.
Teenagers can be a tough group to persuade because they have less capacity at that age to consider long-term health consequences, but there are ways to get the message across, said Sherry Pagoto, a psychologist and professor at University of Connecticut who has studied indoor tanning behavior and tanning bed culture for decades.
“What resonates more with them is physical appearance, because that’s why they’re doing it,” Pagoto said.
Rather than talking about skin cancer, parents can emphasize how excess sun exposure can cause skin to look leathery or wrinkly, she said. They can take their teen to a dermatologist to take a UV photo that shows the skin damage that isn't yet visible to the naked eye.
Pagoto also said it's important for parents to model safe behavior, as many teen girls acquire their tanning habits from their mothers. Making sunscreen easily accessible around the house and buying self-tanner for your teen can be a gentle way to nudge them away from unsafe tanning.
“Change can sometimes take time. So if you’re feeling frustrated ... sometimes you just kind of have to wait for their process to unfold,” Pagoto said.
FILE - A tanning bed is seen on March, 20, 2012, in North Vancouver, Canada. (Jonathan Hayward/The Canadian Press via AP)
