The early use of fracking to get at reserves previously thought of as unrecoverable, shortly after the turn of the 21st century, came about after exploration companies began examining geologic formations using x-ray computed tomography, or CT scanners.

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The patients underwent single-photon emission computed tomography (SPECT) before and after immunization.

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"To put that into context, 20mSv is the same dose you get from three computed tomography (X-ray) scans of your chest, roughly, " she told reporters.

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The technique can provide excellent, detailed images of the body's soft tissue and is an alternative to using X-ray techniques such as computed tomography (CT).

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As most doctors don't know how to use those printers, hospitals need engineers to operate the printers and help convert images from computed tomography and other medical equipment to 3-D data that can be printed out.

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The discover section of the site provides an insight into the science behind the study of Leonardo's work, including explanations and images of infra-red, ultra-violet and my favourite, the "computed axial tomography" of some of da Vinci's work.

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And recent computed tomography (CT) scans of the thighbone of a six-million-year-old Kenyan creature known as Orrorin tugenensis suggest it might have had quite a human gait.

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CT, which stands for computed tomography, builds up a more revealing picture than a simple x-ray by taking a series of cross-section pictures.

BBC: scanner

Healthcare Systems, the largest division of GE Healthcare, consists of a broad portfolio of technology businesses including Computed Tomography, Magnetic Resonance, Ultrasound, Monitoring Solutions, Molecular Imaging, X-Ray, Interventional, Life Support, and Home Health.

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