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.

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But now the simple invention of a cathode ray tube, transforming light into electrons, registering their impact on the magnetic tape, had torn the curtain away.

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Several years ago, during a simple diagnostic chest X-ray, Centor discovered a growth on the lung of one of his patients, who appeared to be in good health.

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When you have selected the type of scientific study of a painting or sketch, a simple slider movement left or right takes you on an X-ray journey through one of the master's works.

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On the plus side, all that's needed is a simple set of four silicon filters in addition to some standard x-ray equipment.

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