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METHODS

10 pathologic and 10 control subjects participated. Pathologic subjects were men aged 35 to 80 with obstructive LUTS, free of UTI, and scheduled for urodynamics at a tertiary care teaching centre at the University of British Columbia. Controls were asymptomatic male volunteers with no prior surgery or condition of the LUT based on history and IPSS questionnaire. A Phantom V611 high-speed camera imaged the urinary stream in profile during repeated uroflow, capturing greyscale images at 800x600 resolution, 24 frames per second, and 90 μs exposure. Degrees of obstruction were quantified with multichannel pressure flow plotted on Abrams Griffiths nomograms.

RESULTS

The urinary stream was isolated using image subtraction and thresholding techniques in MATLAB. The length and surface roughness of the inertia stream were determined. Surface roughness was measured as the sum of squared …