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Fig. 3. —Bar chart shows mean signal-to-noise ratio values of veins, arteries, and adjacent soft tissue determined on source images dependent on time of measurement and on region. Note deep veins in lower leg during third measurement show higher signal-to-noise ratio than arteries. However, when mask is subtracted, arteries show higher signal-to-noise ratio in subtracted data set. White, black, and striped bars indicate veins, arteries, and soft tissue, respectively.

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