Berg, E. van den

flow rate ultrasound infant volume flow rates voiding method signal curve measurement j urol range ultrasound signal disk method probe toilet bladder ultrasound probe flow curves group urethral valves children disk flow curve technique disk signal urethral 8 infants observation patient second urine correlation vesicoureteral reflux delay reflux diaper bladder dysfunction ultrasound method br j urol valve bottom group 1 0.4 seconds compression guinea difference hanson ultrasound system time axis .3– 6 0.5 seconds urethral obstruction 6.7 years guinea pigs urodynamic dysfunction 21 cases range 5 range 4 range 3 range 1 weight change voiding disorders study 10 months pattern range 4.5 0.9 seconds measure result group 2 ./sec child ultrasound technique disk flowmeter treatment time difference ultrasound flow rate pearson correlation test ml ./sec —