手臂MRI扫描

定义

An arm MRI (magnetic resonance imaging) scan uses strong magnets to create pictures of the upper and lower arm. This may include the elbow, wrist, hands, fingers, and the surrounding muscles and other tissues.

它不使用辐射(x射线).

单个MRI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.

选择的名字

MRI - arm; Wrist MRI; MRI - wrist; Elbow MRI; MRI - elbow

如何执行测试

You will wear a hospital gown or clothes without metal zippers or snaps (such as sweatpants and a t-shirt). Make sure you take off your watch, jewelry, and wallet. 核磁共振成像可以拉出任何金属物体. 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 scanner.

一些检查使用一种特殊的染料(造影剂). Most of the time, you will get the dye through a vein in your arm or hand before the test. The dye helps the radiologist see certain areas more clearly.

During the MRI, 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" MRI, 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 surgery with metal 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 MRI 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. 你需要安静地躺着. Too much movement can blur MRI 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 allows you to speak to someone at any time. Some MRIs have televisions and special headphones to help the time pass.

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

为什么要进行测试

This test provides clear pictures of parts of the arm that are hard to see clearly on CT scans.

如果您有以下情况，您的十大赌博平台排行榜可能会要求您进行此测试:

• 肿块:在体检中可以摸到的肿块
• x光或骨扫描的异常发现
• 手臂疼痛和癌症病史
• Arm or wrist pain that does not get better with treatment
• 骨感染(骨髓炎)
• 骨痛和发烧
• 骨折
• Decreased motion or "locking up" of the wrist or elbow joint
• 手腕或肘关节发红或肿胀
• 软骨和韧带的损伤
• Deformity to allow your physician assess the condition better

正常的结果

正常的结果意味着你的手臂看起来很好.

异常结果意味着什么

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
• 脓肿
• 滑囊炎 肘部或手腕的
• 骨折 或断裂
• 手腕神经节囊肿
• 骨骼感染
• Ligament, tendon, or cartilage injury in the wrist or elbow
• 肌肉损伤
• 骨坏死(缺血性坏死)
• Tumor or cancer in the bone, muscle, or soft tissue

Talk to your provider if you have 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 MRI 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. 对这种物质的过敏反应是罕见的. 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 MRI can cause heart pacemakers and other implants to not work as well. It can also cause a piece of metal inside your body to move or shift. For safety reasons, please do not bring anything that contains metal into the scanner room.

注意事项

Tests that may be done instead of an 手臂MRI include:

• 手臂的CT扫描
• 臂x光

在紧急情况下，首选CT扫描. The test is faster than MRI and often available in the emergency room.

参考文献

安德森MW，福克斯MG. 手臂MRI. 见:安德森MW，福克斯MG，编. MRI和CT断层解剖. 第四版. Philadelphia, PA: Elsevier; 2017:chap 4.

Kapoor G, tom AP. Current status of imaging of the musculoskeletal system. In: Adam A, Dixon AK, Gillard JH, Schaefer-Prokop CM, eds. 格兰杰 & 艾利森诊断放射学. 7日艾德. Philadelphia, PA: Elsevier; 2021:chap 38.