Introducing NV-Reason-CT Open 3D CT VLM for Radiologist Chain-of-Thought Reasoning

<img width="768" height="432" src="https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-768x432.jpg" class="webfeedsFeaturedVisual wp-post-image" alt="" style="display: block; margin-bottom: 5px; clear:both;max-width: 100%;" link_thumbnail="" decoding="async" srcset="https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-768x432.jpg 768w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-179x101.jpg 179w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-300x169.jpg 300w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-625x352.jpg 625w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-1536x864.jpg 1536w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-645x363.jpg 645w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-660x370.jpg 660w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-500x281.jpg 500w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-160x90.jpg 160w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-362x204.jpg 362w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-196x110.jpg 196w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-1024x576.jpg 1024w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-960x540.jpg 960w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image.webp 1920w" sizes="(max-width: 768px) 100vw, 768px" title="ct-scan-image" />Radiology AI has made remarkable strides in detecting abnormalities across chest X-rays, pathology slides, and 2D scans. Yet one of the most clinically rich and...<img width="768" height="432" src="https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-768x432.jpg" class="webfeedsFeaturedVisual wp-post-image" alt="" style="display: block; margin-bottom: 5px; clear:both;max-width: 100%;" link_thumbnail="" decoding="async" srcset="https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-768x432.jpg 768w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-179x101.jpg 179w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-300x169.jpg 300w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-625x352.jpg 625w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-1536x864.jpg 1536w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-645x363.jpg 645w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-660x370.jpg 660w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-500x281.jpg 500w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-160x90.jpg 160w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-362x204.jpg 362w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-196x110.jpg 196w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-1024x576.jpg 1024w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image-960x540.jpg 960w, https://developer-blogs.nvidia.com/wp-content/uploads/2026/09/ct-scan-image.webp 1920w" sizes="(max-width: 768px) 100vw, 768px" title="ct-scan-image" /><p>Radiology AI has made remarkable strides in detecting abnormalities across chest X-rays, pathology slides, and 2D scans. Yet one of the most clinically rich and data-dense modalities—the 3D computed tomography (CT) scan—remains largely underserved by modern vision language models (VLMs). Frontier general-purpose models perform poorly on volumetric imaging, and most open medical AI models lack the…</p> <p><a href="https://developer.nvidia.com/blog/introducing-nv-reason-ct-open-3d-ct-vlm-for-radiologist-chain-of-thought-reasoning/" rel="nofollow" data-wpel-link="internal" target="_self">Source</a></p>