肺部宠物扫描

定义

A lung positron emission tomography (宠物扫描是一种成像检查. It uses a radioactive substance (called a tracer) to look for disease in the lungs such as 肺癌.

Unlike magnetic resonance imaging (核磁共振成像)及电脑断层扫描(CT)扫描, which reveal the structure of the lungs, a 宠物 scan shows the activity of the cells within the lungs.

选择的名字

Chest 宠物 scan; Lung positron emission tomography; 宠物 - chest; 宠物 - lung; 宠物 - tumor imaging; 宠物/CT - lung; Solitary pulmonary nodule - 宠物

如何执行测试

A 宠物 scan requires a small amount of tracer. The tracer is given through a vein (IV), usually on the inside of your elbow. It travels through your blood and collects in organs and tissues. The tracer helps the doctor (radiologist) see certain areas or diseases more clearly.

You will need to wait nearby as the tracer is absorbed by your body. 这通常需要1个小时.

Then, you will lie on a narrow table, which slides into a large tunnel-形状d scanner. The 宠物 scanner detects signals from the tracer. A computer changes the results into 3-D pictures. The images are displayed on a monitor for your doctor to read.

考试时你必须躺着不动. Too much movement can blur images and cause errors.

测试大约需要90分钟.

宠物 scans are performed along with a CT scan. This is because the combined information from each scan provides a more complete understanding of the health problem. This combination scan is called a 宠物/CT.

如何准备考试

You may be asked not to eat anything for 4 to 6 hours before the scan. 你就可以喝水了.

Tell your health care provider if:

• You are afraid of tight spaces (have claustrophobia). You may be given a medicine to help you relax and feel less anxious.
• You are pregnant or think you might be pregnant.
• You have any allergies to injected dye (contrast).
• 你用胰岛素治疗糖尿病. 你需要特别的准备.

Tell your provider about the medicines you are taking. These include ones bought without a prescription. Some medicines can interfere with the test results.

考试的感觉如何

You may feel a sharp sting when the needle containing the tracer is placed into your vein.

宠物扫描不会引起疼痛. The table may be hard or cold, but you can request a blanket or pillow.

An intercom in the room allows you to speak to someone at any time.

There is no recovery time, unless you were given a medicine to relax.

为什么要进行测试

此测试可用于:

• Help look for 肺癌, when other imaging tests do not give a clear picture
• See if 肺癌 has spread to other areas of the lungs or body, when deciding on the best treatment
• Help determine if a growth in the lungs (seen on a CT scan) is cancerous or not
• Determine how well cancer treatment is working

正常的结果

A normal result means the scan did not show any problems in the size, 形状, 或者肺的功能.

异常结果意味着什么

异常结果可能是由于:

• Lung cancer or cancer of another area of the body that has spread to the lungs
• 感染
• Inflammation of the lungs due to other causes

Blood sugar or insulin level may affect the test results in people with diabetes.

风险

The amount of radiation used in a 宠物 scan is low. It is about the same amount of radiation as in most CT scans. Also, the radiation does not last for very long in your body.

Women who are pregnant or are breastfeeding should let their provider know before having this test. Infants and babies developing in the womb are more sensitive to the effects of radiation because their organs are still growing.

It is possible, although very unlikely, to have an allergic reaction to the radioactive substance. Some people have pain, redness, or swelling at the injection site. 这很快就会消失.

参考文献

d，杜姆斯C. 正电子发射断层扫描. In: Broaddus VC, Ernst JD, King TE, et al, eds. Murray and Nadel's Textbook of Respiratory Medicine. 7日艾德. Philadelphia, PA: Elsevier; 2022:chap 25.

帕德利SPG，波帕特S，德瓦拉吉A. 肺肿瘤. 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 8.