MedicalAI

ReBrain: Rebuilding MRI from Sparse CT Slices with Retrieval‑Augmented Diffusion

Kari Jaaskelainen

24 Nov 2025 — 1 min read

Can AI fill in the MRI gaps?

When MRI isn’t possible, doctors rely on CT—but low‑dose CT can be very sparse. ReBrain is a research system that reconstructs a 3D, MRI‑like brain volume from just a limited set of CT slices.

It uses a diffusion model to “paint” missing MRI slices from available CT.
It retrieves look‑alike CT slices from a large database and, via a guidance network, keeps structures continuous and realistic.
If retrieval comes up short, it blends alternative cues with spherical linear interpolation to stay on track.

Tested on public datasets (SynthRAD2023, BraTS), ReBrain reached state‑of‑the‑art accuracy for this cross‑modal, low‑data setting.

Goal: more usable brain imaging when MRI access or patient tolerance is limited—not a replacement for clinical MRI.

Paper: https://arxiv.org/abs/2511.17068v1

Paper: https://arxiv.org/abs/2511.17068v1

Register: https://www.AiFeta.com

MedicalAI Neuroimaging MRI CT DiffusionModels HealthcareInnovation ComputerVision

Beyond URLs: Metadata That Makes LLMs Train Faster

Smarter LLMs, Faster—thanks to metadata What if training a large language model didn't just rely on text, but on the context around it? This study shows that adding fine-grained metadata—not just URLs—can meaningfully speed up pretraining and improve quality. * Beyond URLs: detailed quality signals (e.

Escaping the Verifier: Learning to Reason via Demonstrations

LLMs can learn to reason—without task verifiers Many real-world problems don’t have automatic checkers to grade answers, even though we have lots of expert solutions. RARO (Relativistic Adversarial Reasoning Optimization) shows how to train reasoning skills from those examples alone. How it works: * A policy (the model) tries

VacuumVLA: A Two-in-One Robot Hand That Grips and Suctions

Robots guided by Vision-Language-Action (VLA) AI are getting better at everyday tasks—but most still use simple two-finger grippers. That limits them on smooth, flat, or handleless objects. VacuumVLA is a low-cost robot hand that merges a standard two-finger gripper with a vacuum suction cup. The robot can switch between

ChatDRex: No‑Code, Conversational AI for Drug Repurposing

Meet ChatDRex Finding new uses for approved drugs can save years and millions. But making those predictions usually takes teams of specialists and a tangle of tools. ChatDRex changes that. It’s a conversation-based, no‑code, multi‑agent system that lets clinicians and researchers ask complex bioinformatics questions in plain

Can AI fill in the MRI gaps?

Read more

Beyond URLs: Metadata That Makes LLMs Train Faster

Escaping the Verifier: Learning to Reason via Demonstrations

VacuumVLA: A Two-in-One Robot Hand That Grips and Suctions

ChatDRex: No‑Code, Conversational AI for Drug Repurposing