In the late 1980s computer-aided techniques used data from CT scans to mold the radiation beams to the shape of the prostate.

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The study used insurance claims data and couldn't tell when patients got CT scans of multiple parts of the body at the same time, a common occurrence.

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In his presentation at the CORE event, Poon acknowledged that the CT procedures he advocates are seen by many as needing more data before they move into wide use.

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