The Transportation Security Administration said it has found a way to refine the machine's images so that the normally graphic pictures can be blurred in certain areas while still being effective in detecting bombs and other threats.

The agency is expected to provide more information about the technology later this month but said one machine will be up and running at Sky Harbor's Terminal 4 by Christmas.

The security agency's Web site indicates that the technology will be used initially as a secondary screening measure, meaning that only those passengers who first fail the standard screening process will be directed to the X-ray area.

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