![]() ![]() Like a mask, this creates a sound pressure profile with cut-outs at the points where the air bubbles are located. But as soon as the sound wave hits the water with the hydrogen bubbles, it continues to travel only through the liquid. If you send an ultrasonic wave through the chip with a transducer (a kind of miniature loudspeaker), it passes through the chip unhindered. “Thanks to a chip with 10,000 pixels that modulates the ultrasonic wave, we can generate a much finer-resolved profile”. “In this way, we can use much more powerful ultrasonic transducers”, explains postdoctoral fellow Kai Melde, who is part of the team that developed the SUM. With the new technology, the researchers first generate an ultrasonic wave and then modulate its sound pressure profile independently, essentially killing two birds with one stone. The sound transmitters are then so small that the sound pressure is sufficient for diagnostic but not therapeutic purposes. However, because the individual sound sources cannot be miniaturized at will, the resolution of these sound pressure profiles is limited to 1000 pixels. High intensity sound pressure profiles with 10,000 pixelsĬonventional methods vary sound fields with several individual sound sources, the waves of which can be superimposed and shifted against each other. It allows the three-dimensional shape of even very intense ultrasound waves to be varied with high resolution – and with less technical effort than is currently required to modulate ultrasound profiles. The Spatial Ultrasound Modulator (SUM) developed by researchers in Fischer’s group should help to remedy this situation and make ultrasound treatment more effective and easier in other cases. This is because the skullcap distorts the sound wave. Tailoring an intensive ultrasound field to diseased tissue is somewhat more difficult in the brain. ![]() “In order to avoid damaging healthy tissue, the sound pressure profile must be precisely shaped”, explains Peer Fischer, Research Group Leader at the Max Planck Institute for Intelligent Systems and professor at the University of Stuttgart. Researchers worldwide are using ultrasound to combat tumours and other pathological changes in the brain. The ultrasound destroys the cancer cells by specific heating of the diseased tissue. In the US, for example, tumours of the uterus and prostate are treated with high-power ultrasound. Ultrasound is widely used as a diagnostic tool in both medicine and materials science. ![]()
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