脑部磁共振成像
使用磁场和无线电波的非创脑部成像，可无辐射显示脑结构、功能和病理。
什么是 MRI Brain？
脑部MRI是一种非创成像技术，使用强磁场和无线电波创建详细的脑结构和功能图像。与CT相比，它提供卓越的软组织对比度，允许极佳地显示灰质、白质和脑部病变，无需辐射暴露。
工作原理： 在脑部MRI期间，患者躺在一个大磁铁内。无线电波激发脑水和脂肪中的氢质子。扫描仪检测质子重新排列时释放的能量，创建详细图像。不同序列（T1、T2、FLAIR、DWI、SWI等）突出不同组织特征。
MRI Brain 的常见用途
脑卒中评估
Detect acute ischemic stroke within minutes of symptom onset using diffusion-weighted imaging (DWI). Identify infarct core, penumbra, and hemorrhagic transformation. Differentiate acute from chronic strokes.
脑肿瘤检测和特征描述
Identify primary brain tumors (gliomas, meningiomas, pituitary adenomas) and metastases. Assess tumor location, size, edema, and mass effect. Advanced techniques like perfusion MRI and spectroscopy help grade tumors and guide biopsy.
痴呆和神经退行性疾病
Assess brain atrophy patterns characteristic of Alzheimer's disease (medial temporal lobe atrophy), frontotemporal dementia (frontal/temporal atrophy), and other neurodegenerative conditions. Detect vascular dementia and white matter disease.
多发性硬化和脱髓鞘疾病
Detect white matter plaques characteristic of multiple sclerosis. Assess disease burden, monitor progression, and differentiate active from chronic lesions using contrast enhancement. Spinal cord MRI often performed concurrently.
创伤性脑损伤
Detect diffuse axonal injury, contusions, subdural/epidural hematomas, and post-traumatic changes. More sensitive than CT for mild TBI and chronic traumatic encephalopathy. Susceptibility-weighted imaging (SWI) detects microhemorrhages.
感染和炎症
Identify brain abscesses, meningitis, encephalitis, and inflammatory conditions. DWI helps differentiate abscess from other ring-enhancing lesions. Contrast MRI detects blood-brain barrier disruption.
优势
- ✓无辐射暴露
- ✓卓越的软组织对比度
- ✓多平面成像能力
- ✓一次检查多种组织对比（T1、T2、FLAIR、DWI等）
- ✓功能成像能力（fMRI、灌注、DTI）
- ✓无骨伪影
- ✓对碘对比剂过敏患者安全
- ✓可检测CT上不可见的异常
局限性
- ⚠较长的扫描时间（30-60分钟）
- ⚠比CT更昂贵
- ⚠可及性不如CT
- ⚠幽闭恐惧症可能是一个问题
- ⚠不适合有某些植入物的患者（起搏器、动脉瘤夹）
- ⚠运动伪影可能降低图像质量
- ⚠在最初几小时内对急性出血的敏感性不如CT
- ⚠需要患者配合（保持静止）
- ⚠金属植入物引起伪影
- ⚠重度肾病禁忌使用钆对比剂
检查准备清单
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相关影像方式
CT is faster and better for acute hemorrhage. EEG evaluates seizures. Nuclear medicine (PET/SPECT) assess brain metabolism and function.
CT
CT scans use X-rays to create detailed cross-sectional images of the body. They are particularly useful for detecting bone fractures, tumors, and internal bleeding.
MRI
MRI uses powerful magnets and radio waves to produce detailed images of organs and soft tissues. Excellent for brain, spine, and joint imaging.
Ultrasound
Ultrasound uses sound waves to create real-time images. Commonly used for pregnancy monitoring and examining organs like the heart, liver, and kidneys.
浏览 MRI Brain 术语
探索 MRI Brain 报告中的常见术语，每个术语都包含详细解释、临床意义和相关化验，帮助你读懂影像结果。 化验项目.
该影像方式暂无术语。
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医学参考资料
本页面内容参考以下权威医学机构的资料：
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- 2.
- 3.