肺镓扫描

定义

肺镓扫描 is a type of 核扫描 that uses radioactive gallium to identify inflammation in the lungs.

选择的名字

Gallium 67 lung scan; Lung scan; Gallium scan - lung; Scan - lung

How the Test is Performed

Gallium is injected into a vein. The scan will be taken 6 to 24 hours after the gallium is injected. (Test time depends on whether your condition is 急性 or 慢性.)

During the test, you lie on a table that moves underneath a scanner called a gamma camera. The camera detects the radiation produced by the gallium. Images are displayed on a computer screen.

During the scan, it is important that you keep still to get a clear image. The technician can help make you comfortable before the scan begins. The test takes about 30 to 60 minutes.

How to Prepare for the Test

Several hours to 1 day before the scan, you will get an injection of gallium at the place where the testing will be done.

Just before the scan, remove jewelry, dentures, or other metal objects that can affect the scan. Take off the clothing on the upper half of your body and put on a hospital gown.

How the Test will Feel

The injection of gallium will sting, and the puncture site may hurt for several hours or days when touched.

The scan is painless, but you must stay still. This may cause discomfort for some people.

Why the Test is Performed

This test is usually done when you have signs of inflammation in the lungs. This is most often due to 结节病 or a certain type of pneumonia. It is not performed very often in recent years.

正常的结果

The lungs should appear of normal size and texture, and should take up very little gallium.

What Abnormal Results Mean

If a large amount of gallium is seen in the lungs, it may mean any of the following problems:

• Sarcoidosis (disease in which inflammation occurs in the lungs and other tissues of the body)
• Other respiratory infections, most often a type of pneumonia caused by the fungus Pneumocystis jirovecii

风险

There is some risk to children or unborn babies. Because a pregnant or nursing woman may pass on radiation, special precautions need to be taken.

For women who are not pregnant or nursing and for men, there is very little risk from the radiation in gallium, because the amount is very small. There are increased risks if you are exposed to radiation (such as x-rays and scans) many times. Discuss any concerns you have about radiation with the health care provider who recommends the test.

注意事项

Usually the provider will recommend this scan based on the results of a 胸部x光片. Small defects may not be visible on the scan. For this reason, this test is not often done anymore.

参考文献

Harisinghani MG, Chen JW, Weissleder R. 胸部成像. In: Harisinghani MG, Chen JW, Weissleder R, eds. Primer of Diagnostic Imaging. 6日艾德. Philadelphia, PA: Elsevier; 2019:chap 1.

Jokerst CE, Gotway MB. Thoracic radiology: noninvasive diagnostic imaging. 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 20.