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High signal areas are areas of abnormal tissue. Like all tissue, when the brain is injured a scar forms over the injury, if the brain is scarred it will give off a high signal which differentiates it from normal (unscarred) tissue. You can always see scar tissue as it appears white (high signal) on an MRI.
Coupled-optimized dual-resonance photoacoustic sensor platform for detecting gases and their concentrations
A photoacoustic spectroscopy system is provided, comprising an acoustic cell, an electromagnetic radiation unit, and a resonant transducer unit. The acoustic cell includes a resonant cavity supporting a first resonant mode having a first resonant frequency, and to which a sample fluid can be supplied. The resonant transducer supports a second resonant mode having a second resonant frequency and is functionally connected to the resonant cavity. The first and second resonant modes are configured to be coupled in a significant coupling region, and the adjustment of the first and second resonant modes is configured to result in an increase in signal intensity or signal-to-noise ratio.
Owner:NEXTSENSE MICROSYSTEMS INC