自主监督的文本视觉对齐用于自动脑MRI异常检测:一个多中心研究 (ALIGN研究)
David A Wood1, Emily Guilhem2, Sina Kafiabadi2
1School of Biomedical Engineering and Imaging Sciences, King's College London, Rayne Institute, 4th Floor, Lambeth Wing, London SE17 7EH, UK.
Radiology. Artificial intelligence
|November 26, 2025
概括
一个新的自我监督框架使用放射学报告准确地检测大脑MRI异常,消除了对专家标记数据的需求. 这种方法显示出高诊断性能,并且可以很好地对外部数据集进行概括.
科学领域:
- 医疗成像中的人工智能
- 放射学和医学信息学
- 机器学习用于医疗保健
背景情况:
- 专家标记的数据集对于训练医疗成像中的AI模型至关重要,但成本高且耗时.
- 利用现有的自由文本放射学报告为AI模型开发提供了一个可扩展的替代方案.
- 大脑MRI解释需要专门的知识,使自动检测非常有价值.
研究的目的:
- 开发和验证一个自我监督的文本视觉框架,用于检测大脑MRI异常.
- 通过利用放射学报告,消除对专家注释的数据集的依赖.
- 评估该框架在多个机构的诊断性能和通用性.
主要方法:
- 一项回顾性和前性多中心研究,涉及81,936次脑MRI检查和培训/内部测试报告.
- 开发一种神经放射学语言模型 (NeuroBERT),使用自我监督学习进行报告嵌入.
- 训练卷积神经网络将MRI扫描映射到嵌入物,然后进行文本图像相似度评分以检测异常.
主要成果:
- 该框架实现了正常与异常分类的接收器运行特征曲线 (AUC) 下的面积为0.95.
- 对外部位的优异通用性,检查级AUC从0.85到0.90不等.
- 在零射击分类任务 (平均AUC0.89) 和视觉语义图像检索 (平均精度0.84) 中的高性能.
结论:
- 开发的自我监督的文本视觉框架准确地检测大脑MRI异常.
- 这种方法成功地利用了自由文本放射学报告,消除了对专家标记培训数据的需求.
- 该框架展示了强大的诊断能力和在临床环境中的广泛应用.
更多相关视频
相关概念视频
01:24Magnetic Resonance Imaging
Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
01:14Imaging Studies I: CT and MRI
Introduction: MRI and CT scans are crucial advancements in medical imaging techniques, playing a vital role in diagnosing conditions related to the gastrointestinal (GI) system. Each scan serves distinct purposes, targets specific areas, and requires unique nursing duties.
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
Description of the Procedures
Computed Tomography (CT) scan:
Computed Tomography (CT) scans use X-ray technology to generate detailed images of bones, organs, and tissues. During the scan, the patient lies on a moving table...
01:21Imaging Studies for Cardiovascular System IV: CMRI
Cardiovascular magnetic resonance imaging, or CMRI, is a non-invasive diagnostic test that employs a magnetic field and radiofrequency waves to create precise images of the heart and arteries. It provides comprehensive information about cardiac anatomy, function, perfusion, and tissue characterization without ionizing radiation.IndicationsCMRI diagnoses various heart conditions, including tissue damage from heart attacks, ischemic heart disease, myocarditis, aortic issues (tears, aneurysms,...
01:27Imaging Studies IV: Magnetic Resonance Imaging
Introduction:Magnetic Resonance Imaging, or MRI, can include a specialized imaging technique of the urinary system known as Magnetic Resonance Urography (MRU). This radiation-free technique uses strong magnetic fields and radio waves to produce detailed images with the help of a computer. MRU is particularly effective for visualizing fluid-filled structures like the kidneys, ureters, and bladder.Applications of MRI in the Genitourinary SystemKidneys and Ureters: MRI detects tumors, cysts,...