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Figure 1: Significance of flow velocity during voiding. Flow rate can be measured at the urethral meatus using a flow meter. Flow rate (Q) divided by flow velocity (v) is assumed to represent the functional cross-sectional area of the urethra (A), which is a direct parameter of obstruction. Obstruction can thus be quantified by cross-sectional area measurement

Figure 1: Significance of flow velocity during voiding. Flow rate can be measured at the urethral meatus using a flow meter. Flow rate (Q) divided by flow velocity (v) is assumed to represent the functional cross-sectional area of the urethra (A), which is a direct parameter of obstruction. Obstruction can thus be quantified by cross-sectional area measurement