As a medical professional with expertise in diagnostic imaging, I can provide you with information regarding the detection of mini strokes, also known as transient ischemic attacks (TIAs), on MRI scans. Mini strokes are temporary blockages of blood flow to the brain, and they typically do not cause permanent damage. However, they are a warning sign that a person is at risk of a full-blown stroke. When it comes to imaging, MRI is a powerful tool that can detect changes in the brain due to a stroke. For a typical stroke, an MRI can often show areas of the brain that have been affected by a lack of blood supply. This is because a stroke causes an infarction, which results in the death of brain tissue and can be visualized on an MRI as a bright area on diffusion-weighted imaging (DWI) sequences. However, when it comes to TIAs, the situation is different. These are temporary and usually do not result in permanent brain damage or visible changes on an MRI. The reason is that during a TIA, the blockage is temporary and the blood flow is restored before any permanent damage can occur. Therefore, a standard MRI might not show any signs of a TIA. Nonetheless, there are specialized MRI techniques that can detect subtle changes or areas at risk. For instance, diffusion and perfusion MRI (DWI and PWI) can sometimes identify areas of the brain that are at risk of infarction even after the symptoms of a TIA have resolved. In addition to MRI, other diagnostic tests such as an angiogram, CT angiogram, or MR angiogram may be used to identify the specific blood vessel that is blocked or bleeding, which can be crucial in determining the cause and appropriate treatment for the symptoms. In summary, while a standard MRI might not show evidence of a TIA, there are advanced imaging techniques and additional tests that can provide valuable information about the脑血管的状况 and the risk of a future stroke. read more >>

Tests will be done to rule out a stroke or other disorders that may cause the symptoms: You will likely have a head CT scan or brain MRI. A stroke may show changes on these tests, but TIAs will not. You may have an angiogram, CT angiogram, or MR angiogram to see which blood vessel is blocked or bleeding.read more >>