头部磁共振增强流程

头部磁共振增强流程
英文回答：
Contrast-enhanced magnetic resonance imaging (MRI) of the head is a medical imaging technique that uses a magnetic field and radio waves to produce detailed images of the brain and other structures within the head. A contrast agent, such as gadolinium, is injected into a vein in the arm to enhance the visibility of certain tissues and structures. Contrast-enhanced MRI is often used to diagnose and evaluate a wide range of conditions affecting the head, including:
Brain tumors.
Stroke.
Multiple sclerosis.
Alzheimer's disease.
Parkinson's disease.
Infections.
Trauma.
The procedure typically takes about 30 to 60 minutes. During the scan, the patient lies on a table that slides
into a large, donut-shaped magnet. The magnet creates a strong magnetic field that aligns the protons in the body. Radio waves are then emitted by the scanner, which causes
the protons to flip their spins. The protons then release energy as they return to their original alignment, and this energy is detected by the scanner.
The contrast agent enhances the visibility of certain tissues and structures by shortening the relaxation time of protons in those tissues. This makes them appear brighter
on the MRI images. Contrast-enhanced MRI can provide more detailed information than unenhanced MRI, and it is often used to confirm a diagnosis or to rule out other conditions.
中文回答：
头部磁共振增强扫描。

头部磁共振增强扫描是一种利用磁场和无线电波，生成头部内部大脑和其他结构的详细图像的医学成像技术。

将对比剂，例如钆剂，注入手臂的静脉中，以增强某些组织和结构的可见性。

增强型磁共振成像通常用于诊断和评估影响头部的大量病症，其中包括：
脑肿瘤。

中风。

多发性硬化症。

阿尔茨海默病。

帕金森病。

感染。

外伤。

该过程通常需要 30 到 60 分钟。

扫描期间，患者躺在滑进大
型甜甜圈形磁铁中的桌上。

该磁铁会产生强大的磁场，以对齐身体
内的质子。

然后扫描仪会发射无线电波，促使质子反转它们的旋转。

然后，质子在返回其原始对齐状态时释放出能量，该能量被扫描仪
检测到。

对比剂通过缩短这些组织中质子的弛豫时间，从而增强特定组
织和结构的可见性。

这使它们在磁共振图像上显得更亮。

增强型磁
共振成像可以提供比未增强磁共振成像更详细的信息，并且通常用
于确认诊断或排除其他病症。