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https://www.nist.gov/image/breast-phantom-prototypes

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# breast phantom prototypes

## Appears In

                        - Measuring Up: The Phantom of the Library

The original NIST breast phantom prototypes. The one at left is designed to provide a standard for measuring proton spin relaxation time, which varies with different kinds of tissue. The one at right provides references for imaging diffusion and includes insets to determine resolution and geometric distortion.

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