Zhenxuan Zhang

Making MRI usable where the scanner is weak, the patient moves, and the report has to be checked.

Second-year PhD student at Imperial College London, supervised by Prof. Guang Yang and Dr Peter J. Lally, funded by the China Scholarship Council.

My work builds agentic AI for medical imaging along three threads: motion-robust MRI reconstruction with implicit neural representations, ultra-low-field to high-field MRI synthesis via self-supervised diffusion, and verifiable radiology report generation with large language models. Before Imperial I worked on echocardiography analysis at Sun Yat-sen University.

I care about methods that are label-efficient, uncertainty-aware, and deployable, with the long-term aim of turning foundation-model-driven AI into tools radiologists can actually trust in a real workflow.

News

    Research

    Motion-robust MRI reconstruction with implicit neural representations
    Imperial College London · 2024 to now
    PR-INR couples motion-aware diffusion for global structure recovery with implicit detail restoration for local fidelity, reconstructing 3D brain volumes from motion-corrupted 2D slices. It beats the state of the art on five public MRI datasets.
    IEEE Transactions on Image Processing, 2026
    Ultra-low-field to high-field MRI synthesis for point-of-care imaging
    Imperial College London · 2024 to now
    Unpaired low-field to high-field translation for portable 0.05 T scanners: a cyclic self-supervised diffusion model, a pretext-task adversarial framework, and reliability-guided selective generation that abstains on unreliable regions to cut hallucination risk.
    IEEE TMI 2026; two ISBI 2026 orals
    Verifiable radiology report generation with large language models
    Imperial College London · 2024 to now
    Agentic LLM pipelines built with practising radiologists. GEMA-Score decomposes report quality into clinically meaningful sub-criteria scored by cooperating agents; Reason Like a Radiologist uses chain-of-thought and reinforcement learning to produce reasoning traces a clinician can check.
    AAAI 2026; Medical Image Analysis 2025 (co-first author)
    Multi-dimensional echocardiography analysis
    Sun Yat-sen University · 2021 to 2024
    A cross-space consistency framework embedding pixel-, image- and sequence-level tasks into one latent space for cardiac function assessment, validated on 10,908 patients across five datasets, plus a text-guided bidirectional reciprocal cycle for label-efficient segmentation.
    IEEE TMI 2024; Medical Image Analysis 2025

    Publications

    Teaching

    Graduate teaching assistant, Image Processing
    Imperial College London · Jan to Apr 2025
    Tutorial preparation, Q&A sessions, exam marking.
    Graduate teaching assistant, Trustworthy AI in Medical Analysis
    Imperial College London · Mar to May 2025
    Ran in-class discussions and graded project reports.
    MSc final project co-supervisor
    Imperial College London · 2025 and 2026
    Co-supervised a group of four MSc students in 2025 and a group of five in 2026.

    Awards and grants

    Isambard-AI compute grant, UK AI Research Resource
    2025 · DSIT and UKRI
    800,000 GPU hours on Isambard-AI through the AIRR open call, for AI-Enhanced MRI Reconstruction and Diagnostic Modeling Across Magnetic Field Strengths. PI Prof. Guang Yang; I was co-investigator on the winning proposal.
    China Scholarship Council PhD scholarship
    2024 to 2028
    Full funding for doctoral study at Imperial College London.
    Sun Yat-sen University scholarship
    2021 to 2022 first prize · 2022 to 2023 second prize
    National Undergraduate Biomedical Engineering Innovation Design Competition
    2019 · third prize
    Automatic segmentation of spine MRI.

    Education

    PhD in Bioengineering
    Imperial College London · 2024 to 2028 · Prof. Guang Yang and Dr Peter J. Lally
    MSc in Biological and Pharmaceutical Engineering
    Sun Yat-sen University · 2021 to 2024 · Prof. Heye Zhang and Prof. Zhifan Gao
    BEng in Biomedical Engineering
    Sun Yat-sen University · 2017 to 2021

    Languages English, Mandarin, Cantonese, Hakka

    Programming Python, C/C++, MATLAB

    Frameworks PyTorch, TensorFlow

    Interests MRI reconstruction, modality synthesis, vision-language modelling, agentic AI

    Methods implicit neural representations, diffusion models, large language models, uncertainty-aware learning