Clinical Research Directory

Inclusion Criteria: 1. Adults aged 19 years or older who visited the clinical trial institution for brain CTA images between January 2020 and May 2021, and from November 2021 until IRB approval 2. Individuals classified into the positive or negative group based on the following criteria: * Positive group: Diagnosed with large vessel occlusion due to occlusion of the vessels between ICA and MCA-M1 after taking brain CTA images -- Negative group: Diagnosed as either not having large vessel occlusion or as normal after brain CTA images Exclusion Criteria: 1. Cases with poor-quality or incomplete brain CTA images7) 2. Cases where intracranial prosthetic implants (e.g., catheters, coils) were present 3. Cases that were previously used for AI model training and internal validation 4. Any other cases deemed unsuitable for participation in the clinical trial based on the investigator's judgment \* Specific reasons were recorded in the case report form.