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Figure 4: Schematic overview of parameters. V1 is the velocity at the distal prostatic urethra (S1); V2 is the velocity at the membraneous urethra (S2); A1 is the functional cross sectional area at S1, which equals Q/V1; A2 is the functional cross sectional area at S1, which equals Q/V1; and VR is the velocity ratio, which equals V1/V2.

Figure 4: Schematic overview of parameters. V1 is the velocity at the distal prostatic urethra (S1); V2 is the velocity at the membraneous urethra (S2); A1 is the functional cross sectional area at S1, which equals Q/V1; A2 is the functional cross sectional area at S1, which equals Q/V1; and VR is the velocity ratio, which equals V1/V2.