Poon, by many accounts a very bright doctor, is a big proponent of a new technology called CT angiography.

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Dr Zhou has set up a joint venture with Siemens, a German company that builds CT scanners, to develop his technology for diagnostic imaging.

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Volcanologist Sonia Calvari, of the Institute of Geophysics and Volcanology in Catania (INGV-CT), said rapid advances in technology enable experts to use a wide range of methods to continually map and monitor Etna from a distance.

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More and more people are being diagnosed with these lesions as we use more medical imaging technology such as ultrasound, X-ray and CT scanning.

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King's College London, will be exhibiting a device that uses ultrasound technology to build up a 3D image before surgery, cutting out the need for a CT scan.

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