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A–D, The relationship between SNR and flow velocity for four different angles: 30° (A), 45° (B), 60° (C), and 90° (D). The five curves within one graph represent five different concentrations of flow of contrast material. SNRs are not greatly affected by fluid velocity if the concentration of flow is greater than 1.0 mmol/L, but SNR does increase significantly with the increase of velocity when flow concentration is low (≤ 0.5 mmol/L)
