Lumbar MRI scan

Definition

腰椎磁共振成像(MRI)扫描使用来自强磁铁的能量来生成脊柱下部(腰椎)的图像。.

An MRI does not use radiation (x-rays).

Single MRI images are called slices. 这些图像可以存储在计算机上，也可以打印在胶片上. One exam produces many images.

Related exams include:

• Cervical MRI scan (neck MRI)
• MRI

Alternative Names

Magnetic resonance imaging - lumbar spine; MRI - lower back

How the Test is Performed

你将穿着病号服或没有金属扣或拉链的衣服(如运动裤和t恤). 一定要摘掉手表、首饰和手表. MRIs can pull on any metallic objects. Some types of metal can cause blurry images.

你将躺在一张狭窄的桌子上，桌子滑进一个像隧道一样的大管子.

Some exams require a special dye (contrast). 大多数情况下，你会在测试前通过手或手臂的静脉(IV)获得染料. You can also get the dye through an injection. 这种染料可以帮助放射科十大赌博平台排行榜更清楚地看到某些区域.

在核磁共振过程中，操作机器的人会在另一个房间看着你. 测试通常持续30到60分钟，但也可能需要更长时间.

How to Prepare for the Test

你可能会被要求在扫描前4到6个小时不要吃或喝任何东西.

告诉你的十大赌博平台排行榜你是否害怕封闭的空间(有幽闭恐惧症). 十大赌博平台排行榜可能会给你开一种药，帮助你感到困倦和减少焦虑. 你的十大赌博平台排行榜可能会建议你做“开放式”核磁共振成像，这样机器就不会离身体那么近了.

Before the test, tell your provider if you have:

• Brain aneurysm clips
• Certain types of artificial heart valves
• Heart defibrillator or pacemaker
• Inner ear (cochlear) implants
• 肾脏疾病或透析(您可能无法接受对比)
• 最近放置的人工关节或手术植入的钢板和螺钉
• Certain types of vascular stents
• 过去曾接触过金属片(您可能需要检查眼睛中是否有金属片)

Because the MRI contains strong magnets, 金属物品不允许进入有核磁共振扫描仪的房间;

• 钢笔、小刀和眼镜可能会飞到房间的另一边.
• 珠宝、手表、信用卡和助听器等物品都可能被损坏.
• 别针、发夹、金属拉链和类似的金属物品会扭曲图像.
• 可拆卸的牙具应该在扫描前取出.

How the Test will Feel

An MRI exam causes no pain. 你需要躺着不动，因为太多的运动会模糊MRI图像并导致错误.

桌子可能是硬的或冷的，但你可以要一条毯子或枕头. 这台机器开机时会发出巨大的砰砰声和嗡嗡声. You can wear ear plugs to help block out the noise.

房间里的对讲机可以让你随时和别人通话. 一些核磁共振有电视和特殊的耳机，你可以用它来帮助时间流逝.

没有恢复时间，除非你吃了药来放松. 核磁共振扫描后，你可以恢复正常的饮食、活动和药物.

Why the Test is Performed

The most common reasons for this test are:

• 治疗后没有好转的腰痛或盆腔疼痛
• 腿部无力、麻木或其他症状没有改善或加重

如果你有以下情况，十大赌博平台排行榜也可能会要求你做腰椎MRI:

• Back pain and fever
• Birth defects of the lower spine
• Injury or trauma to the lower spine
• Low back pain and a history or signs of cancer
• Multiple sclerosis
• Problems controlling or emptying your bladder
• Disk herniation

Normal Results

正常的结果意味着你的脊柱和附近的神经看起来没有问题.

What Abnormal Results Mean

Most of the time, abnormal results are due to:

• Herniated or "slipped" disk (lumbar radiculopathy)
• Narrowing of the spinal column (spinal stenosis)
• 脊柱骨骼和软骨的异常磨损(腰椎病)

Other abnormal results may be due to:

• Degenerative changes due to age
• Ankylosing spondylitis, a type of arthritis
• Bone infection
• Cauda equina syndrome
• Fractures of the lower back due to osteoporosis
• Disk inflammation (diskitis)
• Spinal cord abscess
• Spinal cord injury
• Spinal tumor
• Syringomyelia

和你的十大赌博平台排行榜谈谈你的问题和担忧.

Risks

MRI uses no radiation. 目前还没有关于磁场和无线电波副作用的报道.

在怀孕期间做核磁共振也是安全的. No side effects or complications have been proven.

最常用的造影剂(染料)是钆. It is very safe. Allergic reactions to this dye are rare. 然而，钆可能对需要透析的肾病患者有害. 如果您有肾脏问题，请在检查前告知您的十大赌博平台排行榜.

核磁共振成像过程中产生的强磁场会导致心脏起搏器和其他植入物无法正常工作. 它还会导致你体内的其他金属块移动或移位. 为了安全起见，请不要携带任何含金属的物品进入扫描室.

References

Chou R, Qaseem A, Owens DK, Shekelle P; Clinical Guidelines Committee of the American College of Physicians. 下背痛的诊断成像:来自美国医师学会的高价值医疗保健建议. Ann Intern Med. 2011;154(3):181-189. PMID: 21282698 pubmed.ncbi.nlm.nih.gov/21282698/.

Sack KD, Rosner MK. Evaluation and treatment of lumbar disk disease. In: Winn HR, ed. Youmans and Winn Neurological Surgery. 8th ed. Philadelphia, PA: Elsevier; 2023:chap 318.

Gardocki RJ, Park AL. 胸椎和腰椎退行性疾病. In: Azar FM, Beaty JH, eds. Campbell's Operative Orthopaedics. 14th ed. Philadelphia, PA: Elsevier; 2021:chap 39.

Samad A, Usmani MF, Khanna AJ. Imaging of the spine. In: Miller MD, Thompson SR, eds. DeLee, Drez, & Miller's Orthopaedic Sports Medicine. 5th ed. Philadelphia, PA: Elsevier; 2020:chap 124.

Van Thielen T, Van den Hauwe L, Van Goethem JW, Parizel PM. 脊柱影像学现状及解剖特征. 见:Adam A, Dixon AK, Gillard JH, Schaefer-Prokop CM，编. Grainger & Allison's Diagnostic Radiology. 7th ed. Philadelphia, PA: Elsevier; 2021:chap 47.