Release date: 2014-05-28 Gizmag, a US technology information website, recently published a review article saying that in the future, light-emitting diode (LED) technology may replace fMRI and PET, which has a certain impact on patients because of strong magnetic fields and radiation. The following is a summary of the article: If doctors want to know the brain activity of a patient, they usually use functional magnetic resonance imaging (fMRI) or positron emission tomography (PET). During the first imaging procedure, the patient is exposed to a strong magnetic field; with PET imaging, the patient will experience intense radiation. Scientists at the University of Washington, St. Louis, recently experimented with "diffuse optical tomography" (DOT). Although it sounds a bit extreme, it actually only shoots the light from the LED into the patient's head. DOT itself is not a new concept, this technology has been used in a small part of the brain research. But the latest DOT system developed by scientists at the University of Washington is able to scan 2/3 of the brain area simultaneously. In other words, the technology can simultaneously image multiple regions of the brain and brain neural networks. When using this technique, the patient wears a cap that has dozens of LEDs and light sensors installed. Light is emitted by these LED bulbs, passing through the patient's skull and into the patient's brain. By analyzing how the brain tissue absorbs and scatters these rays, it is possible to determine when and where hyperoxic blood flows. The increase in cerebral blood flow also indicates the strengthening of cranial nerve activity. In the laboratory test, the area that the new DOT system can image is almost the same as the fMRI imaging capability, and the patient no longer needs to be in a strong magnetic field environment. Although these strong magnetic fields are not harmful in all cases, if the patient is equipped with electronic devices such as pacemakers, cochlear implants or deep brain stimulators, these magnetic fields can cause problems for the patient. Since the DOT system does not involve radiation, it can be used as an alternative to PET imaging in the future. In addition, the DOT system has better portability than the corresponding equipment of fMRI and PET, and can even be carried directly to the patient's place of residence when needed. However, the DOT system also has obvious shortcomings: it can only obtain a more stable and reliable imaging of the brain 1 cm deep, so it is not suitable for deep brain scanning. But scientists at the University of Washington say that 1 cm depth is the most important and most interesting area of ​​the human brain. This area contains a lot of advanced brain functions such as memory, language, self-awareness and so on. Source: Health
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LED brain scan, there may be no radiation worry in the future