腰椎核磁共振成像扫描

定义

A lumbar magnetic resonance imaging (核磁共振成像) scan uses energy from strong magnets to create pictures of the lower part of the spine (lumbar spine).

核磁共振成像不使用辐射(x射线).

单个核磁共振成像图像称为切片. The images can be stored on a computer or printed on film. 一次检查产生许多图像.

相关考试包括:

• 宫颈核磁共振扫描 (脖子核磁共振成像)
• 核磁共振成像

选择的名字

Magnetic resonance imaging - lumbar spine; 核磁共振成像 - lower back

如何执行测试

You will wear a hospital gown or clothes without metal snaps or zippers (such as sweatpants and a t-shirt). Make sure you take off your watch, jewelry and watches. 核磁共振成像可以检测到任何金属物体. 某些类型的金属会导致图像模糊.

You will lie on a narrow table that slides into a large tunnel-like tube.

有些检查需要特殊的染料(造影剂)。. Most of the time, you will get the dye through a vein (IV) in your hand or arm before the test. 你也可以通过注射获得染料. The dye helps the radiologist see certain areas more clearly.

During the 核磁共振成像, the person who operates the machine will watch you from another room. The test most often lasts 30 to 60 minutes, but may take longer.

如何准备考试

You may be asked not to eat or drink anything for 4 to 6 hours before the scan.

Tell your health care provider if you are afraid of closed spaces (have claustrophobia). You may be given a medicine to help you feel sleepy and less anxious. Your provider may suggest an "open" 核磁共振成像, in which the machine is not as close to the body.

在测试前，告诉你的十大赌博平台排行榜你是否有:

• 脑动脉瘤夹
• 某些类型的人工心脏瓣膜
• 心脏除颤器或起搏器
• 内耳(耳蜗)植入物
• Kidney disease or dialysis (you may not be able to receive contrast)
• Recently placed artificial joints or surgically implanted plates and screws
• 某些类型的血管 支架
• Worked with sheet metal in the past (you may need tests to check for metal pieces in your eyes)

因为核磁共振成像含有强磁铁, metal objects are not allowed into the room with the 核磁共振成像 scanner:

• Pens, pocketknives, and eyeglasses may fly across the room.
• Items such as jewelry, watches, credit cards, and hearing aids can be damaged.
• Pins, hairpins, metal zippers, and similar metallic items can distort the images.
• Removable dental work should be taken out just before the scan.

考试的感觉如何

核磁共振检查不会引起疼痛. You will need to lie still as too much movement can blur 核磁共振成像 images and cause errors.

The table may be hard or cold, but you can ask for a blanket or pillow. The machine makes loud thumping and humming noises when turned on. You can wear ear plugs to help block out the noise.

An intercom in the room lets you to speak to someone at any time. Some 核磁共振成像s have televisions and special headphones that you can use to help the time pass.

There is no recovery time, unless you were given a medicine to relax. After an 核磁共振成像 scan, you can return to your normal diet, activity, and medicines.

为什么要进行测试

这种测试最常见的原因是:

• Low back or pelvic pain that does not get better after treatment
• Leg weakness, numbness, or other symptoms that do not improve or get worse

Your provider may also order a lumbar 核磁共振成像 if you have:

• 背痛和发烧
• 下脊柱的先天缺陷
• 脊椎下部受伤或外伤
• 腰痛，有癌症病史或迹象
• 多发性硬化症
• 控制或排空膀胱有问题
• 盘突出

正常的结果

A normal result means your spine and nearby nerves look OK.

异常结果意味着什么

大多数情况下，异常结果是由于:

• 椎间盘突出或“滑动”(腰椎神经根病)
• 脊柱狭窄(脊髓狭窄)
• Abnormal wearing on the bones and cartilage in the spine (lumbar spondylosis)

其他异常结果可能是由于:

• 由于年龄的增长而发生的退行性变化
• 强直性脊柱炎这是一种关节炎
• 骨感染
• 马尾综合征
• 下背部骨折 因为骨质疏松
• 椎间盘炎症(关节盘炎)
• 脊髓脓肿
• 脊髓损伤
• 脊柱肿瘤
• 脊髓空洞症

Talk to your provider about your questions and concerns.

风险

核磁共振成像不使用辐射. There have been no reported side effects from the magnetic fields and radio waves.

It is also safe to have 核磁共振成像 performed during pregnancy. 没有任何副作用或并发症被证实.

The most common type of contrast (dye) used is gadolinium. 它很安全. 对这种染料的过敏反应很少见. However, gadolinium can be harmful to people with kidney problems that need dialysis. If you have kidney problems, please tell your provider before the test.

The strong magnetic fields created during an 核磁共振成像 can cause heart pacemakers and other implants to not work as well. It can also cause other pieces of metal inside your body to move or shift. For safety reasons, please do not bring anything that contains metal into the scanner room.

参考文献

周R, Qaseem一, 欧文斯DK, Shekelle P; Clinical Guidelines Committee of the American College of Physicians. Diagnostic imaging for low back pain: advice for high-value health care from the American College of Physicians. Ann实习十大赌博平台排行榜. 2011;154(3):181-189. PMID: 21282698 pubmed.ncbi.nlm.国家卫生研究院.gov / 21282698 /.

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