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The key to this technique is xenon gas that has been zapped with laser light to “hyperpolarize” the spins of its atomic nuclei so that most are pointing in the same direction. “By detecting the MRI signal of dissolved hyperpolarized xenon after the xenon has been extracted back into the gas phase, we can boost the [...] Now, Wilson, a professor of biomedical engineering at Case Western Reserve University, can identify a single cancer cell in preclinical imaging studies. And he can pinpoint exactly where the cell is located in a three-dimensional image. Called cryo-imaging, the system enables Wilson and collaborators to identify single molecules, count the number of cells in an organ, [...] Researchers at the University of Washington have been able to illuminate brain tumors by injecting fluorescent nanoparticles into the bloodstream that safely cross the blood-brain barrier — an almost impenetrable barrier that protects the brain from infection. The nanoparticles remained in mouse tumors for up to five days and did not show any evidence of [...] The nanostars gyrate when exposed to a rotating magnetic field and can scatter light to produce a pulsating or “twinkling” effect. This twinkling allows them to stand out more clearly from noisy backgrounds like those found in biological tissue. Alexander Wei, a professor of chemistry, and Kenneth Ritchie, an associate professor of physics, led the team [...] Conventional imaging systems incorporate a light source for illuminating an object and a separate sensing device for recording the light rays scattered by the object. By using lenses and software, the recorded information can be turned into a proper image. Human vision is an ordinary process: the use of two eyes (and a powerful brain [...] |
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