Highly accelerated MRI via implicit neural representation guided posterior sampling of diffusion models

IF 10.7 1区 医学 Q1 COMPUTER SCIENCE, ARTIFICIAL INTELLIGENCE Medical image analysis Pub Date : 2024-11-23 DOI:10.1016/j.media.2024.103398
Jiayue Chu , Chenhe Du , Xiyue Lin , Xiaoqun Zhang , Lihui Wang , Yuyao Zhang , Hongjiang Wei
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Abstract

Reconstructing high-fidelity magnetic resonance (MR) images from under-sampled k-space is a commonly used strategy to reduce scan time. The posterior sampling of diffusion models based on the real measurement data holds significant promise of improved reconstruction accuracy. However, traditional posterior sampling methods often lack effective data consistency guidance, leading to inaccurate and unstable reconstructions. Implicit neural representation (INR) has emerged as a powerful paradigm for solving inverse problems by modeling a signal’s attributes as a continuous function of spatial coordinates. In this study, we present a novel posterior sampler for diffusion models using INR, named DiffINR. The INR-based component incorporates both the diffusion prior distribution and the MRI physical model to ensure high data fidelity. DiffINR demonstrates superior performance on in-distribution datasets with remarkable accuracy, even under high acceleration factors (up to R = 12 in single-channel reconstruction). Furthermore, DiffINR exhibits excellent generalizability across various tissue contrasts and anatomical structures with low uncertainty. Overall, DiffINR significantly improves MRI reconstruction in terms of accuracy, generalizability and stability, paving the way for further accelerating MRI acquisition. Notably, our proposed framework can be a generalizable framework to solve inverse problems in other medical imaging tasks.
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通过隐式神经表征引导的扩散模型后向采样实现高速磁共振成像
从采样不足的 k 空间重建高保真磁共振(MR)图像是缩短扫描时间的常用策略。根据真实测量数据对扩散模型进行后向采样,有望显著提高重建精度。然而,传统的后向采样方法往往缺乏有效的数据一致性指导,导致重建不准确、不稳定。隐式神经表示(INR)通过将信号属性建模为空间坐标的连续函数,已成为解决逆问题的强大范例。在这项研究中,我们为使用 INR 的扩散模型提出了一种新型后验采样器,名为 DiffINR。基于 INR 的组件结合了扩散先验分布和核磁共振物理模型,以确保高数据保真度。DiffINR 在分布内数据集上表现出卓越的性能,即使在高加速因子(单通道重建中高达 R = 12)条件下也能保持出色的准确性。此外,DiffINR 在各种组织对比度和解剖结构上都表现出卓越的通用性,不确定性很低。总之,DiffINR 在准确性、通用性和稳定性方面大大提高了磁共振成像重建的效率,为进一步加速磁共振成像采集铺平了道路。值得注意的是,我们提出的框架可用于解决其他医学成像任务中的逆问题。
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来源期刊
Medical image analysis
Medical image analysis 工程技术-工程:生物医学
CiteScore
22.10
自引率
6.40%
发文量
309
审稿时长
6.6 months
期刊介绍: Medical Image Analysis serves as a platform for sharing new research findings in the realm of medical and biological image analysis, with a focus on applications of computer vision, virtual reality, and robotics to biomedical imaging challenges. The journal prioritizes the publication of high-quality, original papers contributing to the fundamental science of processing, analyzing, and utilizing medical and biological images. It welcomes approaches utilizing biomedical image datasets across all spatial scales, from molecular/cellular imaging to tissue/organ imaging.
期刊最新文献
Corrigendum to "Detection and analysis of cerebral aneurysms based on X-ray rotational angiography - the CADA 2020 challenge" [Medical Image Analysis, April 2022, Volume 77, 102333]. Editorial for Special Issue on Foundation Models for Medical Image Analysis. Few-shot medical image segmentation with high-fidelity prototypes. The Developing Human Connectome Project: A fast deep learning-based pipeline for neonatal cortical surface reconstruction. AutoFOX: An automated cross-modal 3D fusion framework of coronary X-ray angiography and OCT.
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